Wire break monitoring system

Abstract

To provide a wiring disconnection monitoring system which monitors the disconnection of a wiring in a range from an upper level device to an electric apparatus so as to improve reliability.SOLUTION: In a wiring disconnection monitoring system, two terminal devices 100 are provided for an upper level device 110. Each of the terminal devices is provided with: switches SW1, SW2, which can be closed when predetermined operations are performed on the two terminals; and a terminal block 30. External signal lines 102, 106 from the upper level device and an external common line 104 are connected step-by-step through the switches SW1, SW2 of the terminal device to the switches SW1, SW2 of a terminal device 100-2. When an operation switch 112 of the upper level device is turned on to start to supply power through an external relay control line 108, de-energized period normally closed contacts X1, X2 of a relay X are opened, and the open state of the relay X is maintained even when the operation switch is turned off thereafter. Thereby, a loop line is formed from the external signal line 102 through internal wiring of the terminal device to the external common line 104, so that a disconnection monitoring state of the upper level device is started.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a wire break monitoring system that monitors wire breaks in facilities in which electrical equipment is connected to a higher-level device, such as emergency tunnel equipment in which electrical equipment installed in a fire hydrant device is connected to a disaster prevention receiving panel. [Background technology]

[0002] Conventionally, fire hydrants have been installed as emergency tunnel equipment in tunnels such as those on expressways and expressways. A fire hydrant system has a fire hose and valves, including a hydrant valve, stored in a fire hydrant storage compartment within a housing equipped with a fire hydrant door, and two fire extinguishers stored in a fire extinguisher storage compartment within a housing equipped with a fire extinguisher door. Generally, fire hydrant systems are installed at predetermined intervals along the length of the tunnel, for example, every 50 meters.

[0003] In addition, the fire hydrant device is equipped with electrical equipment such as a red indicator light, a transmitter (manual reporting device), a pump start button used by the fire brigade to start the fire pump, a pump start linkage device that is linked to the operation of the hydrant valve, a response lamp that indicates when the transmitter has been pressed, and a telephone jack for making calls to the disaster prevention receiving panel installed in the electrical room during maintenance, etc.

[0004] Figure 21 is an explanatory diagram showing some of the wiring from the disaster prevention receiving panel to the electrical equipment installed in the hydrant device. As shown in Figure 21, the telephone line T, telephone common line TC, pump start line HA, manual notification line M, manual notification common line MC, response line MF, and response common line FC, which are drawn from the disaster prevention receiving panel and drawn into the hydrant device's housing, are connected to the transmitter 24, pump start push button 32, pump start interlocking device 34, response lamp 26, and telephone jack 28 using terminal block 30 located inside the hydrant device's housing. Note that the red indicator light uses a separate terminal block, so its description and illustration are omitted.

[0005] Of these electrical devices, the manual reporting line M, pump starting line HA, and manual reporting common line MC, which are connected to the transmitter 24, pump start push button 32, and pump start interlocking device 34, which perform particularly important functions in the event of a fire, are monitored for breaks by connecting a termination resistor 48 between the terminals at the terminal block 30 where the manual reporting line M and the manual reporting common line MC are connected, and by connecting a termination resistor 50 between the terminals at the terminal block 30 where the pump starting line HA and the manual reporting common line MC are connected. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-055073 Summary of the Invention [Problem to be solved by the invention]

[0007] However, conventional wire break monitoring does not monitor for breaks in the internal wiring from the terminal block 30 to the electrical equipment within the fire hydrant device, particularly the transmitter 24, pump start push button 32, and pump start interlocking device 34, which perform important functions in the event of a fire.The state of the break is unknown until the break in the internal wiring is confirmed for the first time during a function confirmation test conducted during regular inspection of the emergency equipment, and there is a possibility that the emergency equipment will not function properly in the event of a fire.

[0008] Furthermore, it is assumed that breaks in the internal wiring may occur due to deterioration of the internal wiring cables or terminals on the terminal block over time, and although extremely rare, cases of such breaks have been discovered during past regular inspections. Therefore, there is a need to further improve the reliability of emergency equipment in harsh environments such as inside tunnels.

[0009] The present invention aims to provide a wire break monitoring system that can monitor wire breaks, including internal wiring from a terminal block inside a device to electrical equipment, in facilities where electrical equipment is connected to a higher-level device, such as emergency tunnel equipment where electrical equipment installed in a fire hydrant device is connected to a disaster prevention receiving panel, thereby improving reliability. [Means for solving the problem]

[0010] (First invention: Wire disconnection monitoring for equipment in which electrical equipment is connected to a host device) The present invention provides a wire break monitoring system for a facility in which electrical equipment is connected to a host device, The upper device and the electrical equipment are connected by the first wiring and the second wiring, a third wiring is connected between a first connection point of the first wiring and a second connection point of the second wiring in the electrical equipment via a terminator, thereby forming a loop line from a higher-level device to the higher-level device via the first wiring, the second wiring, and the third wiring; The host device is characterized by monitoring the loop line for breaks.

[0011] (Second invention: Wire disconnection monitoring for equipment in which multiple electrical devices are connected to a host device) According to another aspect of the present invention, there is provided a wire break monitoring system for a facility in which a plurality of electrical devices are connected to a host device, comprising: a first wiring that is wired from the upper device to connect first connection points of all of the electrical devices in series; a second wiring that is wired from the upper device to connect the second connection points of all the electrical devices in series; This connects the host device to multiple electrical devices, a third wiring via a terminator between a first connection point in the final-stage electrical equipment, which is the furthest point in the connection to the host device via the first wiring, and a second connection point in the final-stage electrical equipment, which is the furthest point in the connection to the host device via the second wiring, thereby forming a loop line from the host device to the host device via the first wiring, the second wiring, and the third wiring; The host device is characterized by monitoring the loop line for breaks.

[0012] (Third invention: disconnection monitoring of equipment in which multiple electrical devices are connected to a host device, with the first wiring being an individual wiring for each electrical device) According to another aspect of the present invention, there is provided a wire break monitoring system for a facility in which a plurality of electrical devices are connected to a host device, comprising: a first wiring individually wired from the upper device to a first connection point of each electrical device; a second wiring that is wired from the upper device to connect the second connection points of all the electrical devices in series; This allows the upper device to be connected to multiple electrical devices, By connecting the first connection point of each electrical device to the second connection point of the final-stage electrical device, which is the farthest point in the connection to the host device via the second wiring, with a third wiring wired via a terminator, a different loop line is formed for each electrical device from the host device to the host device via the first wiring, the second wiring, and the third wiring; The host device is characterized by monitoring each of the loop lines for breaks.

[0013] (Fourth invention: Disconnection monitoring of equipment in which multiple electrical devices divided into multiple groups are connected to a host device) According to another aspect of the present invention, there is provided a wire break monitoring system for a facility in which a plurality of electrical devices are connected to a host device, comprising: The plurality of electrical devices are divided into a plurality of groups, a first wiring that is individually wired for each group from the higher-level device and that is wired so as to connect in series the first connection points of all the electrical devices that belong to the group; a second wiring that is wired from the upper device to connect the second connection points of all the electrical devices in series; This allows the upper device to be connected to multiple electrical devices, a third wiring wired via a terminator between a first connection point in the final-stage electrical equipment, which is the furthest in the connection to the host device via the first wiring of each group, and a second connection point in the final-stage electrical equipment, which is the furthest in the connection to the host device via the second wiring, thereby forming a different loop line for each group from the host device to the host device via the first wiring, the second wiring, and the third wiring; The host device is characterized by monitoring each of the loop lines for breaks.

[0014] (Specific embodiment of the first invention) In the first invention, The electrical equipment is placed in a terminal device equipped with a terminal block, The first wiring, the second wiring, and the third wiring are wired using a terminal block, The first wiring is External wiring from the host device to the first terminal of the terminal block; Internal wiring from a first terminal on the terminal block to a first connection point on the electrical equipment; and The second wiring is External wiring from the host device to the fourth terminal of the terminal block, Internal wiring from the fourth terminal of the terminal block to the second connection point of the electrical equipment; and The third wiring is Internal wiring from the second terminal of the terminal block to the first connection point of the electrical equipment; Internal wiring from the third terminal of the terminal block to the second connection point of the electrical equipment; Internal wiring from the second terminal to the third terminal of the terminal block; and The terminator is provided on the internal wiring from the second terminal to the third terminal of the terminal block.

[0015] (Specific embodiment of the second invention) In the second invention, The plurality of electrical devices are arranged corresponding to a plurality of terminal devices each having a terminal block; The first wiring, the second wiring, and the third wiring are wired using a terminal block, The first wiring is External wiring from the host device to a first terminal of a terminal block corresponding to a first-stage electrical device that is closest to the host device in connection with the first wiring; Each of the internal wirings from the first terminal of the terminal block corresponding to each electrical device to the first connection point of the corresponding electrical device; Each of the internal wirings from the second terminal of the terminal block corresponding to each electrical device except for the final-stage electrical device in the connection by the first wiring to the first connection point of the corresponding electrical device; Each of the external wirings from the second terminal of the terminal block corresponding to each electrical device except the final-stage electrical device in the connection by the first wiring to the first terminal of the terminal block corresponding to the next-stage electrical device in the connection by the first wiring; and The second wiring is External wiring from the upper device to the fourth terminal of the terminal block corresponding to the first-stage electrical equipment that is closest to the upper device when connected via the second wiring; Each of the internal wirings from the fourth terminal of the terminal block corresponding to each electrical device to the second connection point of the corresponding electrical device; In the connection by the second wiring, each of the internal wirings from the third terminal of the terminal block corresponding to each electrical device except for the final-stage electrical device to the second connection point of the corresponding electrical device; Each of the external wirings from the third terminal of the terminal block corresponding to each electrical device except for the final-stage electrical device in the connection by the second wiring to the fourth terminal of the terminal block corresponding to the next-stage electrical device in the connection by the second wiring; and The third wiring is In the connection by the first wiring, internal wiring from the second terminal of the terminal block corresponding to the final stage electrical equipment to the first connection point of the corresponding electrical equipment; In the connection by the second wiring, internal wiring from the third terminal of the terminal block corresponding to the final stage electrical equipment to the second connection point of the corresponding electrical equipment; Internal wiring from the second terminal to the third terminal of the terminal block corresponding to the final stage electrical equipment; and The terminator is provided on the internal wiring of the third wiring from the second terminal to the third terminal of the terminal block.

[0016] (Specific embodiment of the third invention) In the third invention, The electrical equipment is placed in a terminal device equipped with a terminal block, The first wiring, the second wiring, and the third wiring are wired using a terminal block, The first wiring is Each of the external wirings from the host device to the first terminal of the terminal block corresponding to each electrical device; Each of the internal wirings from the first terminal of the terminal block corresponding to each electrical device to the first connection point of the corresponding electrical device; and The second wiring is External wiring from the host device to the fourth terminal of the terminal block, which is common to all electrical equipment, Internal wiring from the fourth terminal of the terminal block to the second connection point of the first-stage electrical equipment, which is the closest point in connection with the upper device via the second wiring; Each of the internal wirings from the second connection point of each electrical device except for the electrical device at the final stage in the connection by the second wiring to the second connection point of the electrical device at the next stage in the connection by the second wiring; and The third wiring is Each of the internal wirings from the second terminal of the terminal block corresponding to each electrical device to the first connection point of the corresponding electrical device; Each internal wiring from the second terminal of the terminal block corresponding to each electrical device to the third terminal common to all electrical devices; Internal wiring from the third terminal to the second connection point of the final stage electrical equipment in the connection by the second wiring; and The terminators are provided on each of the internal wirings from the second terminals of the terminal blocks corresponding to the electrical equipment to the third terminal common to all the electrical equipment.

[0017] (Specific embodiment of the fourth invention) In the fourth invention, The plurality of electrical devices are arranged corresponding to a plurality of terminal devices each having a terminal block; The first wiring, the second wiring, and the third wiring are wired using a terminal block, The first wiring is Each of the external wirings from the host device to the first terminal of the terminal block corresponding to the first stage electrical device that is closest in connection with the host device through the first wiring of each group; Each of the internal wirings from the first terminal of the terminal block corresponding to each electrical device to the first connection point of the corresponding electrical device; Each of the internal wirings from the second terminal of the terminal block corresponding to each electrical device except for the final-stage electrical device in the connection by the first wiring to the first connection point of the corresponding electrical device; Each of the external wirings from the second terminal of the terminal block corresponding to each electrical device except the final-stage electrical device in the connection by the first wiring to the first terminal of the terminal block corresponding to the next-stage electrical device in the connection by the first wiring; and The second wiring is External wiring from the upper device to a fourth terminal common to all electrical equipment arranged on the terminal block of the terminal device in which the first-stage electrical equipment that is closest to the upper device in connection with the upper device via the second wiring is arranged; Internal wiring from the fourth terminal of the terminal block of each terminal device to the second connection point of the first-stage electrical equipment, which is the closest point in the same terminal device when connected to the upper device via the second wiring; Each of the internal wirings from the second connection point of the electrical equipment to the second connection point of the electrical equipment that is the next stage in the connection by the second wiring and is arranged in the same terminal device; Each of the internal wirings from the third terminal of the terminal block, which is common to all the electrical equipment arranged in the same terminal device except for the terminal device in which the final-stage electrical equipment in the connection by the second wiring is arranged, to the second connection point of the electrical equipment in which the next-stage electrical equipment in the connection by the second wiring is arranged in another terminal device; Each of the external wirings from the third terminal of the terminal block to the fourth terminal of the terminal block arranged in the terminal device in which the next-stage electrical equipment in the connection by the second wiring is arranged; and, and The third wiring is Each of the internal wirings from the second terminal of the terminal block corresponding to the final stage electrical equipment in the connection by the first wiring of each group to the first connection point of the corresponding electrical equipment; Internal wiring from a third terminal common to all electrical equipment arranged on a terminal block of a terminal device in which an electrical equipment in a final stage is arranged in the connection by the second wiring to a second connection point of the electrical equipment in the final stage in the connection by the second wiring; Each of the internal wirings from the second terminal to the third terminal of the terminal block corresponding to the final stage electrical equipment in the connection by the first wiring of each group; and The terminators are provided on the internal wiring from each of the second terminals of the terminal block to the third terminal of the third wiring.

[0018] (Breakdown indicator light) In the first to fourth aspects of the invention, an indicator light is further connected between the second terminal and the third terminal of the terminal block provided in the terminal device.

[0019] (Breakdown notification) In the first to fourth inventions, a transfer line is provided between the upper device and the terminal device, The terminal device includes a disconnection notification unit that detects a disconnection in the loop line and transmits a disconnection notification signal to a higher-level device.

[0020] (Relay contact breakage signal transfer) As the disconnection notification unit, a relay is provided between each of the second and third terminals of the terminal block provided in the terminal device, The relay's third normally closed contact when not energized is connected to the transfer line, and when the relay stops operating and the third normally closed contact when not energized is closed, a wire break transfer signal is sent to the higher-level device via the transfer line.

[0021] (Fail-safe circuit in the second invention) In the second invention, further, The relay is connected between the second terminal and the third terminal of the terminal block corresponding to each electrical device so that the relay is connected to the second terminal of the terminal block via a normally open contact provided in the relay when not energized, A first terminal and a second terminal of a terminal block corresponding to each electrical device are connected via a first normally closed contact when not energized that each relay has, and a third terminal and a fourth terminal corresponding to each electrical device are connected via a second normally closed contact when not energized, An external relay control line for operating the relay is connected to the second terminal side of each relay.

[0022] (Fail-safe circuit that can identify the location of a broken wire in the second invention) In the second invention, further, The indicator light is connected between the second terminal and the third terminal of the terminal block corresponding to each electrical device so that the indicator light is connected to the second terminal of the terminal block via a normally open contact when not energized that the relay has, A delay circuit is provided between the normally open contact of each relay when not energized and the third terminal of the terminal block to which the relay is connected, corresponding to each relay except for the first stage relay which is located closest in connection to the host device, and is configured so that the time constant becomes larger as the relay is located farther away in connection to the host device.

[0023] (Fail-safe circuit in the fourth invention) In the fourth aspect of the present invention, the relay is further connected to the second terminal of the terminal block corresponding to each electrical device and the third terminal of the terminal block common to all electrical devices arranged in the same terminal device, so that the second terminal of the terminal block is connected to the second terminal of the terminal block via a normally open contact provided in the relay when not energized, A first terminal and a second terminal of a terminal block corresponding to each electrical device are connected via a first normally closed contact when not energized that is provided in each relay, The third and fourth terminals of the terminal block common to all electrical equipment arranged in the same terminal device are connected via the second normally closed contact when not energized provided in any of the relays arranged in the same terminal device, An external relay control line for operating the relay is connected to the second terminal side of each relay.

[0024] (Fail-safe circuit that can identify the location of a broken wire in the fourth aspect of the invention) In the fourth invention, further, The indicator light is connected to the second terminal of the terminal block through a normally open contact provided in the relay when not energized, and the second terminal of the terminal block corresponding to each electrical device is connected to the third terminal common to all electrical devices arranged in the same terminal device, A delay circuit is provided between the normally open contact of each relay when not energized and the third terminal of the terminal block to which the relay is connected, corresponding to each relay except for the first stage relay which is located closest in connection to the host device, and is configured so that the time constant becomes larger as the relay is located farther away in connection to the host device.

[0025] (Fail-safe circuit including disconnection notification unit according to the second and fourth aspects of the invention) A transfer line is provided between the upper device and the terminal device, The relay is a disconnection notification unit that detects a disconnection in the loop line and transmits a disconnection notification signal to a higher-level device. The third normally closed contact of the relay is connected to the transfer line, and when the relay stops operating and the third normally closed contact is closed, a wire break transfer signal is sent to the higher-level device via the transfer line.

[0026] (Power supply via external relay control line in the second and fourth inventions) In the second and fourth aspects of the present invention, the higher-level device is provided with a power supply for supplying power to the external relay control line and an operation unit for operating the supply and stop of power from the power supply to the external relay control line.

[0027] (Tunnel emergency equipment) A wire break monitoring system according to any one of the first to fourth aspects of the present invention, The facility is an emergency facility for a tunnel in which predetermined electrical equipment arranged in a fire hydrant device or a manual reporting device functioning as a terminal device is connected to a disaster prevention receiving panel functioning as a host device, The predetermined electrical equipment includes a transmitter, a pump start push button, and a pump start interlocking device.

[0028] (Transfer of disconnection information using telephone lines) Among the first to fourth aspects of the present invention, a wire break monitoring system equipped with a relay, The facility is an emergency facility for a tunnel in which predetermined electrical equipment arranged in a fire hydrant device or a manual reporting device functioning as a terminal device is connected to a disaster prevention receiving panel functioning as a host device, The transfer line is a telephone line installed between the disaster prevention receiving panel and the fire hydrant device or manual reporting device. When the relay stops operating and the third normally closed contact is closed, a call signal is sent via the telephone line to the disaster prevention receiving panel as a line breakage notification signal. [Effects of the Invention]

[0029] (Effects of the wire breakage monitoring system according to the first to fourth inventions) According to the wire break monitoring systems of the first to fourth inventions, even in facilities where predetermined electrical equipment arranged in terminal devices is connected to a conventional higher-level device, one or more loop lines are formed including the internal wiring from the terminal block to each electrical device, making it possible to monitor for wire breaks, including internal wiring that could not be monitored for breaks in the past, and even if a break occurs in the internal wiring in the terminal device due to aging or other reasons, the break is detected and allows for prompt repair and restoration. Furthermore, since wire break monitoring is possible including the internal wiring, even in emergency facilities located in harsh environments such as tunnels and requiring high reliability, it is possible to respond with a sufficiently high level of reliability.

[0030] (Effect of disconnection indicator light) Furthermore, because an indicator light is connected between the second and third terminals of the terminal block provided on the terminal device, it is possible to determine whether a wire break has occurred by checking the terminal device. Furthermore, when electrical equipment is provided corresponding to multiple terminal devices as in the second and fourth inventions, the lighting status of the indicator lights provided on each terminal device will differ depending on the location of the wire break, making it possible to easily and quickly identify the location of the wire break during, for example, an on-site inspection, and quickly repair and restore the equipment. Furthermore, when multiple electrical equipment are provided on a terminal device, as in the third and fourth inventions, with the first wiring being individual wiring that is different from the other electrical equipment and electrical equipment belonging to other groups, and the second wiring being common to all the electrical equipment, the lighting status of the indicator lights corresponding to the electrical equipment provided on the same terminal device and the electrical equipment belonging to each group will differ depending on the location of the wire break, making it possible to easily and quickly identify the location of the wire break during, for example, an on-site inspection, and quickly repair and restore the equipment.

[0031] (Effect of the disconnection signal transfer unit) Furthermore, in tunnel emergency equipment, conventionally, breaks are detected by wire break monitoring performed at a predetermined cycle by a disaster prevention receiving panel that functions as a higher-level device, but by providing a wire break transfer unit, it becomes possible to immediately recognize that a break has occurred without waiting for the wire break monitoring that is performed at a predetermined cycle. Also, while a transfer line (a transfer signal line and a transfer common line) is installed to send a wire break transfer signal, since tunnel emergency equipment is equipped with telephone jacks on fire hydrant devices, etc., a call signal using the telephone line to which the telephone jack is connected can be sent as a wire break transfer signal to the disaster prevention receiving panel, allowing for easy transfer without adding a dedicated transfer line, thereby reducing costs.

[0032] (Effect of fail-safe circuit) In the disconnection monitoring systems of the second and fourth inventions, if a disconnection occurs in the internal wiring, the loop line is disconnected and the operating relay stops, and the first non-energized normally-closed contact of the relay connected between the first and second terminals of the terminal block and the second non-energized normally-closed contact of the relay connected between the third and fourth terminals of the terminal block close, electrically disconnecting the disconnected internal wiring and reforming a new loop line via the bypass circuit, thereby maintaining the functionality of other electrical equipment connected in stages subsequent to the electrical equipment corresponding to the disconnected internal wiring. Also, when the relay stops, the non-energized normally-open contact of the relay opens, disconnecting the connection between the second terminal of the terminal block and the relay, preventing the relay from operating again after the relay has stopped operating and opening the first non-energized normally-closed contact and the second non-energized normally-closed contact, and therefore stably maintaining the newly formed loop line by the bypass circuit. Furthermore, once the relay stops operating, the connection between the second terminal of the terminal block and the relay is severed, so the relay cannot be operated by power supply from the external wiring. However, because an external relay control line is connected to each relay, the relay can be operated again by supplying power from the external relay control line.

[0033] (Effect of fail-safe circuit that enables wire breakage location to be identified) In the second and fourth inventions of the wire breakage monitoring system, by connecting an indicator light between the second and third terminals of the terminal block so as to be connected via the normally open contact of the relay when no current is applied, the indicator light goes out when the relay stops operating, making it possible to easily and simply identify the location of the wire breakage during on-site inspection, for example, and to quickly repair and restore it. Furthermore, except for the first-stage relay, a delay circuit is provided between the normally open contact of each relay when no current is applied and the third terminal of the terminal block, and is configured so that the time constant increases as the distance from the host device increases, thereby stopping the operation of only the relay corresponding to the internal wiring where the wire breakage occurred, and for the other relays, the delay circuit ensures the voltage required to operate the relay and allows them to maintain their operating state from the time the wire breakage occurs until the loop line is formed again.

[0034] Furthermore, even when the relay functions as a wire breakage reporting unit, it is possible to stop the operation of only the relay corresponding to the internal wiring where the wire breakage has occurred, while maintaining the operation of the other relays, so that only the wire breakage reporting signal from that relay is sent to the upper device, making it possible to identify the wire breakage location not in the terminal device but in the upper device, making it easier to identify the wire breakage location. [Brief explanation of the drawings]

[0035] [Figure 1] FIG. 1 is an explanatory diagram showing an overview of emergency equipment for tunnels. [Figure 2] FIG. 1 is an explanatory diagram showing a fire hydrant device. [Figure 3] 1 is a wiring circuit diagram showing a first embodiment of a disconnection monitoring system, taking as an example a facility in which a single electrical device arranged in a single terminal device is connected to a higher-level device. [Figure 4] FIG. 10 is a wiring circuit diagram showing a second embodiment of a disconnection monitoring system, taking as an example an installation in which electrical equipment, each of which is arranged on a plurality of terminal devices, is connected in stages to a higher-level device. [Figure 5] FIG. 10 is a wiring circuit diagram showing a third embodiment of a disconnection monitoring system, taking as an example a facility in which a plurality of electrical devices arranged in a single terminal device are connected to a higher-level device. [Figure 6] FIG. 10 is a wiring circuit diagram showing a fourth embodiment of a disconnection monitoring system, taking as an example an installation in which a plurality of electrical devices arranged in a plurality of terminal devices are connected in stages to a higher-level device. [Figure 7] FIG. 10 is a wiring circuit diagram showing a first-stage fire hydrant device of the tunnel emergency facility of FIG. 1 to which a fourth embodiment of the wire breakage monitoring system is applied. [Figure 8] FIG. 10 is a wiring circuit diagram showing a fire hydrant device at the final stage of the emergency tunnel facility of FIG. 1 to which a fourth embodiment of the wire breakage monitoring system is applied. [Figure 9] FIG. 8 is a wiring circuit diagram showing the wiring circuits of the transmitter, pump start push button, and pump start interlocking device for the fire hydrant devices in the first stage of FIG. 7 and the last stage of FIG. 8. [Figure 10] FIG. 5 is a wiring circuit diagram showing a second embodiment of the disconnection monitoring system of FIG. 4, which is provided with a fail-safe circuit. [Figure 11] FIG. 7 is a wiring circuit diagram showing a fourth embodiment of the disconnection monitoring system of FIG. 6, which is provided with a fail-safe circuit. [Figure 12] FIG. 10 is a wiring circuit diagram showing a wire breakage monitoring system according to a modification of the fourth embodiment, in which an individual external common line is provided for each switch. [Figure 13] FIG. 8 is a wiring circuit diagram showing the first-stage fire hydrant device in the tunnel emergency equipment disconnection monitoring system of FIG. 7, which is provided with a fail-safe circuit. [Figure 14] FIG. 9 is a wiring circuit diagram showing the fire hydrant device at the final stage in the tunnel emergency equipment disconnection monitoring system of FIG. 8, which is provided with a fail-safe circuit. [Figure 15] This is a wiring circuit diagram showing the wiring circuits of the transmitter, pump start push button, and pump start interlocking device for the fire hydrant devices of the first stage in Figure 13 and the last stage in Figure 14, which are equipped with fail-safe circuits. [Figure 16]FIG. 5 is a wiring circuit diagram showing a second embodiment of the wire breakage monitoring system of FIG. 4, which is provided with a fail-safe circuit that enables the position of a wire breakage to be identified. [Figure 17] FIG. 7 is a wiring circuit diagram showing a fourth embodiment of the wire breakage monitoring system of FIG. 6, which is provided with a fail-safe circuit that enables the position of a wire breakage to be identified. [Figure 18] FIG. 8 is a wiring circuit diagram showing the first-stage fire hydrant device in the tunnel emergency equipment wire break monitoring system of FIG. 7, which is provided with a fail-safe circuit that can identify the wire break location. [Figure 19] FIG. 9 is a wiring circuit diagram showing the fire hydrant device at the final stage in the tunnel emergency equipment wire break monitoring system of FIG. 8, which is provided with a fail-safe circuit that can identify the wire break location. [Figure 20] This is a wiring circuit diagram showing the wiring circuits of the transmitter, pump start push button, and pump start interlocking device for the fire hydrant devices in the first stage of Figure 18 and the last stage of Figure 19, which are equipped with a fail-safe circuit that can identify the location of a broken wire. [Figure 21] FIG. 10 is a wiring circuit diagram showing wiring for some electrical equipment of a conventional fire hydrant device. DETAILED DESCRIPTION OF THE INVENTION

[0036] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a wire break monitoring system according to the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments.

[0037] [Basic concept of the embodiment] First, the basic concept of the embodiment will be described. The embodiment relates to a disconnection monitoring system that generally monitors disconnections in facilities in which predetermined electrical equipment is connected to a host device, and more specifically, to a disconnection monitoring system that monitors disconnections in emergency tunnel facilities in which predetermined electrical equipment, including a transmitter, a pump start push button, a pump start interlocking device, and the like, disposed in a fire hydrant device that functions as a terminal device, is connected to a disaster prevention receiving panel that functions as a host device.

[0038] Here, a "host device" is a device that mainly manages or controls a subordinate device connected to it, and the subordinate device is a managed controlled device or controlled device that is mainly managed or controlled by the host device. The subordinate device is, for example, various "terminal devices" such as a fire hydrant device in a tunnel emergency facility, and includes devices (transmitters and other) as well as electrical equipment and electrical components installed within or attached to these devices. Furthermore, "electrical equipment" includes devices, equipment, components, etc. that are connected to the host device via electrical wiring so that they can be managed or controlled by the host device.

[0039] The disconnection monitoring system for a facility in which predetermined electrical equipment is connected to a higher-level device can be divided into the following four embodiments.

[0040] The first embodiment (first invention) of the wire break monitoring system is a wire break monitoring system for equipment in which electrical equipment is connected to a higher-level device, and the higher-level device and the electrical equipment are connected by a first wiring and a second wiring, and a third wiring is used to connect between a first connection point of the first wiring in the electrical equipment and a second connection point of the second wiring via a terminator, thereby forming a loop line from the higher-level device to the higher-level device via the first wiring, second wiring, and third wiring, and the higher-level device monitors for wire breaks in the loop line.

[0041] Here, the "first wiring" and "second wiring" refer to wiring that connects a higher-level device and an electrical device, enabling the higher-level device to manage or control the electrical device, and include, for example, a "signal line" and a "common line," etc. Also, the "first connection point" and "second connection point" refer to a connection point of the first wiring or the second wiring in the electrical device, and include, for example, a terminal of the electrical device. In addition, the "third wiring" is wiring for connecting the first wiring and the second wiring without passing through the circuits, components, etc. that the electrical equipment has, and by combining the "first wiring," "second wiring," and "third wiring," a loop line is formed from one upper device to another.

[0042] Furthermore, as a specific embodiment of the first embodiment of the wire break monitoring system, the electrical equipment is arranged in a terminal device equipped with a terminal block, the first wiring, the second wiring, and the third wiring are wired using the terminal block, the first wiring is the external wiring from the upper device to the first terminal of the terminal block and the internal wiring from the first terminal of the terminal block to the first connection point of the electrical equipment, the second wiring is the external wiring from the upper device to the fourth terminal of the terminal block and the internal wiring from the fourth terminal of the terminal block to the second connection point of the electrical equipment, the third wiring is the internal wiring from the second terminal of the terminal block to the first connection point of the electrical equipment, the internal wiring from the third terminal of the terminal block to the second connection point of the electrical equipment, and the internal wiring from the second terminal to the third terminal of the terminal block, and the terminator is provided in the internal wiring from the second terminal to the third terminal of the terminal block.

[0043] Here, a "terminal block" is a device that relays connections when connecting electrical equipment so that it can be managed or controlled by a higher-level device, and is equipped with first to fourth terminals. The "first to fourth terminals" are connection points for the "internal wiring" and "external wiring" that form part of the first wiring, second wiring, and third wiring in the terminal block. The "first to fourth terminals" are merely names used to distinguish the terminals of the terminal block.

[0044] Furthermore, "internal wiring" refers to wiring connecting electrical equipment arranged in the same terminal device to a terminal block, and wiring between the second and third terminals of the terminal block via a terminator, and includes internal signal lines, internal common lines, etc. In contrast, "external wiring" refers to wiring that does not fall under the category of internal wiring, such as wiring connecting a higher-level device to a terminal block, and includes external signal lines, external common lines, etc. Furthermore, in the second embodiment (second invention) and fourth embodiment (fourth invention) described below, wiring across multiple terminal devices is also included, and therefore wiring connecting the terminal block of a given terminal device to the terminal block of another terminal device is treated as "external wiring."

[0045] A second embodiment (second invention) of the wire break monitoring system is a wire break monitoring system for equipment in which a plurality of electrical devices are connected to a higher-level device, and the higher-level device and the plurality of electrical devices are connected by a first wiring that is wired from the higher-level device to connect in series the first connection points of all of the electrical devices, and a second wiring that is wired from the higher-level device to connect in series the second connection points of all of the electrical devices, and a third wiring via a terminator is connected between the first connection point of the final-stage electrical device, which is the farthest position in the connection to the higher-level device via the first wiring, and the second connection point of the final-stage electrical device, which is the farthest position in the connection to the higher-level device via the second wiring, thereby forming a loop line from the higher-level device to the higher-level device via the first wiring, second wiring, and third wiring, and the higher-level device monitors for wire breaks in the loop line.

[0046] Here, the first wiring "wired so as to connect the first connection points of all electrical devices in series from the host device" refers to a stepwise connection from the host device to all the first connection points of electrical devices via a common wiring, passing through the first connection points of all the electrical devices from the host device. The "final stage" refers to the first connection point of the electrical device that is the farthest in the connection with the host device via the first wiring. The "first stage" refers to the first connection point of the electrical device that is closest in the connection with the host device via the first wiring. From the first connection point of a given electrical device, the first connection point of the electrical device that is one stage closer to the final stage is treated as the "next stage," and the first connection point of the electrical device that is one stage closer to the first stage is treated as the "previous stage." The same applies when the "first connection point" is referred to as the "second connection point" and the "first wiring" is referred to as the "second wiring." Furthermore, the definitions of "first stage," "final stage," "next stage," and "previous stage" are the same even when viewed in units of "electrical equipment," "terminal device," or "relay" (described later) rather than in units of "first connection point of electrical equipment."

[0047] In addition, as a specific embodiment of the second embodiment of the disconnection monitoring system, a plurality of electrical devices are arranged corresponding to a plurality of terminal devices equipped with terminal blocks, and the first wiring, second wiring, and third wiring are wired using the terminal blocks.

[0048] The first wiring is the external wiring from the higher-level device to the first terminal of the terminal block corresponding to the first-stage electrical equipment that is closest in the connection to the higher-level device via the first wiring, each of the internal wirings from the first terminal of the terminal block corresponding to each electrical equipment to the first connection point of the corresponding electrical equipment, each of the internal wirings from the second terminal of the terminal block corresponding to each electrical equipment except the final-stage electrical equipment in the connection via the first wiring to the first connection point of the corresponding electrical equipment, and each of the external wirings from the second terminal of the terminal block corresponding to each electrical equipment except the final-stage electrical equipment in the connection via the first wiring to the first terminal of the terminal block corresponding to the next-stage electrical equipment in the connection via the first wiring.

[0049] The second wiring includes external wiring from the upper device to the fourth terminal of the terminal block corresponding to the first-stage electrical equipment that is closest in the connection to the upper device via the second wiring, each of the internal wiring from the fourth terminal of the terminal block corresponding to each electrical equipment to the second connection point of the corresponding electrical equipment, each of the internal wiring from the third terminal of the terminal block corresponding to each electrical equipment except the final-stage electrical equipment in the connection via the second wiring to the second connection point of the corresponding electrical equipment, and each of the external wiring from the third terminal of the terminal block corresponding to each electrical equipment except the final-stage electrical equipment in the connection via the second wiring to the fourth terminal of the terminal block corresponding to the next-stage electrical equipment in the connection via the second wiring.

[0050] In addition, the third wiring is internal wiring from the second terminal of the terminal block corresponding to the final stage electrical equipment to the first connection point of the corresponding electrical equipment in the connection using the first wiring, internal wiring from the third terminal of the terminal block corresponding to the final stage electrical equipment to the second connection point of the corresponding electrical equipment in the connection using the second wiring, and internal wiring from the second terminal to the third terminal of the terminal block corresponding to the final stage electrical equipment, and the terminator is provided in the internal wiring from the second terminal to the third terminal of the terminal block in the third wiring.

[0051] A third embodiment (third invention) of the wire break monitoring system is a wire break monitoring system for equipment in which a plurality of electrical devices are connected to a host device, in which the host device and the plurality of electrical devices are connected via first wiring that is individually wired from the host device to the first connection point of each electrical device, and second wiring that is wired from the host device to connect the second connection points of all of the electrical devices in series, and a third wiring that is wired via a terminator between each of the first connection points of each electrical device and the second connection point of the final electrical device, which is the farthest in the connection to the host device via the second wiring, thereby forming a different loop line for each electrical device from the host device to the host device via the first wiring, second wiring, and third wiring, and the host device monitors for wire breaks in each of the loop lines.

[0052] Here, the first wiring "individually wired from the higher-level device to the first connection point of each electrical device" means that the first connection point of each electrical device is connected to the higher-level device by a different wiring, meaning that other electrical devices are not connected to the wiring that is connected from the higher-level device to the first connection point of a specific electrical device.

[0053] As a specific example of the third embodiment of the disconnection monitoring system, the electrical equipment is arranged in a terminal device equipped with a terminal block, and the first wiring, the second wiring, and the third wiring are wired using the terminal block.

[0054] The first wiring is each of the external wirings from the higher-level device to the first terminal of the terminal block corresponding to each electrical device, and each of the internal wirings from the first terminal of the terminal block corresponding to each electrical device to the first connection point of the corresponding electrical device.

[0055] The second wiring is the external wiring from the upper device to the fourth terminal of the terminal block that is common to all electrical equipment, the internal wiring from the fourth terminal of the terminal block to the second connection point of the first-stage electrical equipment that is the closest in the connection to the upper device via the second wiring, and the internal wiring from the second connection point of each electrical equipment except for the final-stage electrical equipment in the connection via the second wiring to the second connection point of the next-stage electrical equipment in the connection via the second wiring.

[0056] The third wiring is the internal wiring from the second terminal of the terminal block corresponding to each electrical device to the first connection point of the corresponding electrical device, the internal wiring from the second terminal of the terminal block corresponding to each electrical device to the third terminal common to all electrical devices, and the internal wiring from the third terminal to the second connection point of the electrical device in the final stage in the connection via the second wiring, and a terminator is provided for each internal wiring from the second terminal of the terminal block corresponding to each electrical device to the third terminal common to all electrical devices.

[0057] Here, the third and fourth terminals "common to all electrical equipment" mean terminals common to all electrical equipment installed in the terminal device. In other words, for example, if a terminal is called a "third terminal," the third terminal corresponding to a specific electrical equipment and the third terminal corresponding to another electrical equipment installed in the same terminal device are the same terminal on the terminal block. Furthermore, even if they are separate terminals, if they can be electrically connected to each other, or otherwise treated as essentially the same terminal, they are included in the concept of "the same terminal."

[0058] The fourth embodiment (fourth invention) of the wire break monitoring system is a wire break monitoring system for a facility in which a plurality of electrical devices are connected to a host device, in which the plurality of electrical devices are divided into a plurality of groups and individually wired from the host device to each group. The host device and the plurality of electrical devices are connected via first wiring wired to connect in series the first connection points of all of the electrical devices belonging to the group, and second wiring wired from the host device to connect in series the second connection points of all of the electrical devices. The first connection point of the final-stage electrical device, which is the farthest position in the connection to the host device via the first wiring of each group, and the second connection point of the final-stage electrical device, which is the farthest position in the connection to the host device via the second wiring, are each connected by third wiring wired via a terminator, thereby forming different loop lines for each group from the host device to the host device via the first wiring, second wiring, and third wiring, and the host device monitors for breaks in each of the loop lines, and this corresponds to an embodiment that combines the second embodiment of the wire break monitoring system and the third embodiment of the wire break monitoring system.

[0059] Here, "divided into multiple groups" includes physical division, conceptual division, etc., and the number of electrical devices belonging to one group is arbitrary, and the number of electrical devices belonging to each group may differ, and there may also be a group that belongs to only one electrical device.

[0060] Furthermore, as a specific example of the fourth embodiment of the wire breakage monitoring system, the electrical equipment is arranged in a terminal device equipped with a terminal block, and the first wiring, the second wiring, and the third wiring are wired using the terminal block.

[0061] The first wiring includes each of the external wirings from the higher-level device to the first terminal of the terminal block corresponding to the first-stage electrical equipment that is closest in the connection to the higher-level device via the first wiring of each group, each of the internal wirings from the first terminal of the terminal block corresponding to each electrical equipment to the first connection point of the corresponding electrical equipment, each of the internal wirings from the second terminal of the terminal block corresponding to each electrical equipment other than the final-stage electrical equipment in the connection via the first wiring to the first connection point of the corresponding electrical equipment, and each of the external wirings from the second terminal of the terminal block corresponding to each electrical equipment other than the final-stage electrical equipment in the connection via the first wiring to the first terminal of the terminal block corresponding to the next-stage electrical equipment in the connection via the first wiring.

[0062] The second wiring is the external wiring from the higher-level device to the fourth terminal common to all electrical equipment arranged on the terminal block of the terminal device in which the first-level electrical equipment closest to the higher-level device in the connection via the second wiring is arranged, the internal wiring from the fourth terminal of the terminal block of each terminal device to the second connection point of the first-level electrical equipment closest to the higher-level device in the connection via the second wiring within the same terminal device, the internal wiring from the second connection point of the electrical equipment to the second connection point of the electrical equipment that is the next level in the connection via the second wiring and is arranged on the same terminal device, the internal wiring from the third terminal of the terminal block common to all electrical equipment arranged on the same terminal device to the second connection point of the electrical equipment that is the next level in the connection via the second wiring and is arranged on another terminal device, and the external wiring from the third terminal of the terminal block to the fourth terminal of the terminal block arranged on the terminal device in which the electrical equipment that is the next level in the connection via the second wiring is arranged.

[0063] In addition, the third wiring is each of the internal wirings from the second terminal of the terminal block corresponding to the final-stage electrical equipment in the connection by the first wiring of each group to the first connection point of the corresponding electrical equipment, the internal wiring from the third terminal common to all electrical equipment arranged in the terminal block of the terminal device in which the final-stage electrical equipment is arranged in the connection by the second wiring to the second connection point of the final-stage electrical equipment in the connection by the second wiring, and each of the internal wirings from each of the second terminals of the terminal block corresponding to the final-stage electrical equipment in the connection by the first wiring of each group to the third terminal, and a terminator is provided in each of the internal wirings from each of the second terminals of the terminal block corresponding to the final-stage electrical equipment in the third wiring to the third terminal.

[0064] In the first to fourth embodiments of the disconnection monitoring system, an indicator light may be connected between the second terminal and the third terminal of the terminal block provided in the terminal device.

[0065] In addition, a transfer signal line may be provided between the upper device and the terminal device, and the terminal device may be equipped with a disconnection transfer unit that detects a break in the internal wiring and transmits a disconnection transfer signal to the upper device.The disconnection transfer unit may be provided by providing a relay between each of the second and third terminals of a terminal block provided in the terminal device, and the third normally closed contact of the relay when not energized may be connected to the transfer line, and the disconnection transfer signal may be transmitted to the upper device via the transfer line when the third normally closed contact is closed due to the stoppage of operation of the constantly energized relay.

[0066] In addition, in the second embodiment of the disconnection monitoring system, in order to have a fail-safe circuit, the relay is connected between the second and third terminals of the terminal block corresponding to each electrical device so that the relay is connected to the second terminal of the terminal block via a normally open contact provided in the relay when not energized, the first and second terminals of the terminal block corresponding to each electrical device are connected via a first normally closed contact provided in each relay, and the third and fourth terminals of the terminal block corresponding to each electrical device are connected via a second normally closed contact when not energized, and an external relay control line for operating the relay may be connected to the second terminal side of each relay.

[0067] In addition, in the fourth embodiment of the wire breakage monitoring system, in order to have a fail-safe circuit, the relay is connected to the second terminal of the terminal block via a normally open contact when not energized that the relay has, and the second terminal of the terminal block corresponding to each electrical device is connected to the third terminal of the terminal block common to all electrical devices arranged in the same terminal device, the first and second terminals of the terminal block corresponding to each electrical device are connected via a first normally closed contact when not energized that each relay has, the third and fourth terminals of the terminal block common to all electrical devices arranged in the same terminal device are connected via a second normally closed contact when not energized that any relay arranged in the same terminal device has, and an external relay control line for operating the relay can be connected to the second terminal side of each relay.

[0068] Here, "relay" includes various switching devices that switch wiring connections or switch between connection and disconnection, and "contact" includes a switching point of wiring that switches wiring connections or switches between connection and disconnection. Also, a "de-energized normally closed contact" is a contact that is closed when the relay is not operating and open when the relay is operating, and a "de-energized normally open contact" is a contact that is open when the relay is not operating and closed when the relay is operating. Also, the "first de-energized normally closed contact through third de-energized normally closed contact" that a relay has are merely names used to distinguish the de-energized normally closed contacts.

[0069] Furthermore, when applying a wire break monitoring system to emergency tunnel equipment, since a telephone jack is provided on a fire hydrant device or the like, a relay may be provided between each of the second and third terminals of a terminal block provided on the terminal device as a wire break reporting unit, and the third normally closed when not energized contact of the relay, which is always energized, may be connected in parallel via a resistor to the terminal of the telephone jack connected to the telephone line from the disaster prevention receiving panel, and when the operation of the relay stops and the third normally closed when not energized contact is closed, a call signal may be sent to the disaster prevention receiving panel as a wire break reporting signal.

[0070] Furthermore, in order to enable the location of a wire breakage to be identified, the fail-safe circuits of the second and fourth embodiments of the wire breakage monitoring system may be further configured such that an indicator light is connected between each of the second and third terminals of the terminal block so that the indicator light is connected to the second terminal of the terminal block via a normally open contact when not energized that the relay has, and a delay circuit is provided between the normally open contact when not energized that the relay has in correspondence with each relay except for the first stage relay which is located closest in connection to the upper device and the third terminal of the terminal block to which the relay is connected, and the time constant becomes larger as the position in connection to the upper device becomes farther.

[0071] Here, a "delay circuit" is any circuit that can supply power to a relay installed in a terminal device that is located earlier than the terminal device in which the delay circuit is installed, so that the operation of the relay installed in the same terminal device does not stop from the time the break occurs until the loop line is re-formed by the fail-safe circuit of the terminal device in which the break occurs, and the circuit configuration is arbitrary, and may include, for example, an RC circuit, etc.

[0072] Specific embodiments will be described below. In the specific embodiments shown below, first, an outline of emergency tunnel equipment in which electrical equipment of a fire hydrant device functioning as a terminal device is connected to a disaster prevention receiving panel functioning as a host device to which a wire break monitoring system is applied will be described, followed by first to fourth embodiments of a wire break monitoring system for equipment in which predetermined electrical equipment arranged in the terminal device is connected to the host device, and finally, a specific embodiment of emergency tunnel equipment to which a wire break monitoring system is applied will be described.

[0073] [Specific details of the embodiment] The wire breakage monitoring system and tunnel emergency equipment will be explained in more detail below. a. Overview of emergency equipment for tunnels b. First embodiment of wire breakage monitoring system c. Second embodiment of wire breakage monitoring system d. Third embodiment of wire breakage monitoring system e. Fourth embodiment of wire breakage monitoring system f. Specific examples of tunnel emergency equipment using a wire breakage monitoring system f1. First stage fire hydrant wiring circuit f2. Final stage fire hydrant wiring circuit f3. Loop line monitored for breaks g. Fail-safe circuit h. Fail-safe circuit of the second embodiment i. Fail-safe circuit of the fourth embodiment j. Fail-safe operation in the event of a wire break in the fourth embodiment j1. Fail-safe operation in case of internal wiring breakage in Case 1 j2. Fail-safe operation in case of internal wiring breakage in Case 2 j3. Fail-safe operation in case of internal wiring breakage in Case 3 k. Fail-safe circuit in a modification of the fourth embodiment l. Fail-safe circuit for wire break monitoring system in emergency equipment for tunnels l1. Fail-safe operation when the internal wiring of the fire hydrant device is broken l2. Fail-safe operation in case of internal wiring breakage in case 1 l3. Fail-safe operation in case of internal wiring breakage in Case 2 l4. Fail-safe operation in case of internal wiring breakage in Case 3 m. Fail-safe circuit that enables identification of the location of a broken wire m1. Fail-safe circuit that enables identification of the disconnection position in the second embodiment m2. Fail-safe circuit that enables identification of the disconnection position in the fourth embodiment m3. Fail-safe circuit that enables identification of broken wire location in emergency equipment for tunnels n. Modifications of the present invention

[0074] [a. Overview of tunnel emergency equipment] The tunnel emergency equipment to which the wire breakage monitoring system of this embodiment is applied will be outlined in more detail.

[0075] As shown in Figure 1, the tunnel emergency equipment is a system in which a distribution cable 14 extending from a disaster prevention receiving panel 12 installed in the electrical room of the tunnel facility is connected in stages to, for example, four fire hydrant devices 10 (10-1) to 10 (10-4) installed in each longitudinal unit section of the tunnel. The disaster prevention receiving panel 12 is provided with a disconnection monitoring unit 40, which monitors for disconnections in the distribution cable 14 connected to the fire hydrant devices 10 (10-1) to 10 (10-4).

[0076] Here, among the fire hydrant devices 10(10-1) to 10(10-4), the fire hydrant device 10(10-1) connected to the position closest to the disaster prevention receiving panel 12 in terms of wiring connection is the "first stage," and the fire hydrant device 10(10-4) connected to the position farthest is the "last stage." Also, for example, from the perspective of the fire hydrant device 10(10-2), the fire hydrant device 10(10-1) is the "previous stage," and the fire hydrant device 10(10-3) is the "next stage." In this way, the fire hydrant device located one stage away from the fire hydrant device 10(10-2) is the "next stage" fire hydrant device, and the fire hydrant device located one stage away from the fire hydrant device 10(10-2) is the "previous stage" fire hydrant device.

[0077] In addition, the wiring cables 14 include high-voltage wiring cables intended for commercial AC power supplies and low-voltage wiring cables intended for specified DC voltage power supplies, and the low-voltage wiring cables include those consisting of one or more signal lines and a common line.

[0078] Next, the fire hydrant device 10 (10-1) will be described in detail. The same applies to the fire hydrant devices 10 (10-2) to (10-4). As shown in Fig. 2, the fire hydrant device 10 (10-1) has a structure divided into a housing 10a whose interior serves as a fire hydrant storage section and a housing 10b whose interior serves as a fire extinguisher storage section, and decorative frames 11a and 11b are attached to the front of the housings 10a and 10b.

[0079] The door opening of the decorative frame 11a of the housing 10a is divided into upper and lower halves, and a forward-leaning fire hydrant door 15 that opens downward on a hinge is installed at the lower part of the door opening, and a maintenance door 16 that opens upward on a hinge is installed at the upper part of the door opening, and inside the door opening is a fire hydrant storage section that stores fire hoses and valves including a fire hydrant valve.

[0080] A fire extinguisher door 18 that opens sideways to the left on a hinge is provided on the left side of the door opening in the decorative frame 11b of the housing 10b, and the fire extinguisher storage area inside can store, for example, two fire extinguishers. In addition, a viewing window is provided below the fire extinguisher door 18, making it possible to check whether a fire extinguisher is present from outside.

[0081] An electrical door 20 that opens sideways to the right on a hinge is provided on the right side of the door opening in the decorative frame 11b. The electrical door 20 is provided with electrical equipment such as a red indicator light 22, a transmitter 24, and an answer lamp 26, and a telephone jack is provided inside the housing 10b of the electrical door 20.

[0082] The red indicator light 22 is always lit, allowing the installation location of the fire hydrant device 10 (10-1) to be known from a distance. In the event of a fire, when the transmitter 24 is pressed and the switch of the transmitter 24 is turned on, a transmission signal is sent to the disaster prevention receiving panel in the electrical room and a fire alarm is output, and in response to this, a response signal is sent from the disaster prevention receiving panel, causing the red indicator light 22 to flash and the response lamp 26 to light up.

[0083] The right side of the housing 10a is a valve storage section, and a fire hose is connected to a water supply pipe drawn in from the outside via a water supply hydrant, a fire hydrant valve, and an automatic pressure regulating valve. The fire hydrant valve is opened and closed using a fire hydrant valve opening / closing lever, and opening and closing the fire hydrant valve opening / closing lever turns on and off the switch of the pump start interlocking device 34. In addition, a pump start push button 32 for use by the fire brigade is provided inside the open maintenance door 16. The pump start push button 32 may also be provided inside the open fire hydrant door 15.

[0084] Additionally, disconnection indicator lights 36, 38 are provided below the electrically equipped door 20 as part of a wire breakage monitoring system. A detailed explanation of the emergency tunnel equipment to which the wire breakage monitoring system is applied will be given later, but the wire breakage indicator light 36 is provided corresponding to the loop line for wire breakage monitoring that includes the wiring to the transmitter 24, and the wire breakage indicator light 38 is provided corresponding to the loop line for wire breakage monitoring that includes the wiring to the pump start push button 32 and the pump start interlocking device 34, and lights up under normal conditions and goes out when a wire breakage occurs in the internal wiring of the corresponding loop line.

[0085] Terminal boxes 25a and 25b equipped with terminal blocks are arranged on the inner rear surface of housing 10b behind fire extinguisher door 18. A high-voltage distribution cable (external wiring) from the disaster prevention receiving panel is connected to the terminal block of terminal box 25a, and internal wiring for red indicator light 22 is also connected to the terminal block of terminal box 25a.

[0086] Furthermore, a low-voltage wiring cable (external wiring) from the disaster prevention receiving panel is connected to the terminal block of the terminal box 25b, and internal wiring is also connected to the transmitter 24, response lamp 26, telephone jack, pump start push button 32, and pump start interlocking device 34. Here, the wiring connecting the disaster prevention receiving panel to the electrical equipment of the fire hydrant device is divided by the terminal block, with the disaster prevention receiving panel side being the "external wiring" and the electrical equipment side being the "internal wiring."

[0087] [b. First embodiment of wire breakage monitoring system] Here, the first embodiment of the wire break monitoring system will be described in more detail using an example of a facility in which a single electrical device arranged in a single terminal device is connected to a higher-level device. Figure 3 shows an example of a wiring circuit diagram of the wire break monitoring system. In addition, the description will be given assuming that wiring is connected to a switch provided in the electrical device.

[0088] As shown in FIG. 3, a terminal device 100 into which an external signal line 102 and an external common line 104 from a higher-level device are connected is provided with, as an example, a single switch SW1 that is closed by a predetermined operation and a terminal block 30.

[0089] The terminal block 30 is configured such that four terminals are assigned to one switch, with the first terminal A1 and the second terminal A2 assigned to correspond to the switch terminal S1 (first connection point) of the switch SW1, and the third terminal A3 and the fourth terminal A4 assigned to correspond to the switch terminal S2 (second connection point).

[0090] In order to form a loop line for wire break monitoring that runs from the external signal line 102 through the internal wiring in the terminal device 100 to the external common line 104, the wiring connections are made as follows.

[0091] First, the switch terminal S1 of the switch SW1 is connected to the first terminal A1 and the second terminal A2 of the terminal block 30 by separate internal signal lines, and the switch terminal S2 of the switch SW1 is connected to the third terminal A3 and the fourth terminal A4 of the terminal block 30 by separate internal common lines. An external signal line 102 is connected to the first terminal A1 of the terminal block 30, and an external common line 104 is connected to the fourth terminal A4. Furthermore, a parallel circuit of a terminating resistor 42 functioning as a terminator and a disconnection indicator light 36 using an LED is connected between the second terminal A2 and the third terminal A3. Note that the wiring between the second terminal A2 and the third terminal A3 via the terminating resistor 42 is treated as included in the "internal wiring."

[0092] In addition, in this embodiment, the external signal line 102 from the higher-level device to the first terminal A1 of the terminal block 30 and the internal signal line from the first terminal A1 of the terminal block 30 to the switch terminal S1 of the switch SW1 are the "first wiring," the external common line 104 from the higher-level device to the fourth terminal A4 of the terminal block 30 and the internal common line from the fourth terminal A4 of the terminal block 30 to the switch terminal S2 of the switch SW1 are the "second wiring," and the internal signal line from the second terminal A2 of the terminal block 30 to the switch terminal S1 of the switch SW1, the internal common line from the third terminal A3 of the terminal block 30 to the switch terminal S2 of the switch SW1, and the internal wiring from the second terminal A2 of the terminal block 30 to the third terminal A3 of the terminal block 30 via the termination resistor 42 are the "third wiring."

[0093] This wiring connection forms a loop line from the external signal line 102 through the internal wiring of the terminal device 100 to the external common line 104. The path of the loop line is indicated by symbols as follows: [external signal line 102] - [first terminal A1 of terminal block 30] - [switch terminal S1 of switch SW1] - [second terminal A2 of terminal block 30] - [disconnection indicator light 36 and terminating resistor 42] - [third terminal A3 of terminal block 30] - [switch terminal S2 of switch SW1] - [fourth terminal A4 of terminal block 30] - [external common line 104].

[0094] Furthermore, the disconnection monitoring from the host device is performed, for example, by switching the external signal line 102 and the external common line 104 to a line for disconnection monitoring provided in the host device at predetermined intervals, detecting the disconnection monitoring current flowing through the loop line, determining that it is normal if it is equal to or greater than a predetermined threshold, and determining that it is disconnected if it is equal to or less than the predetermined threshold, and outputting a disconnection alarm. Furthermore, if a disconnection occurs in any of the loop lines due to aging or the like, the current flowing through the loop line stops, so the disconnection indicator light 36 goes out, and the occurrence of the disconnection can be confirmed by the terminal device 100.

[0095] [c. Second embodiment of wire breakage monitoring system] Next, a second embodiment of the disconnection monitoring system will be described in more detail using an example of a facility in which electrical equipment, each installed on a plurality of terminal devices, is connected in stages to a higher-level device. Figure 4 shows an example of a wiring circuit diagram of the disconnection monitoring system. In addition, the description will be given assuming that wiring is connected to a switch provided in the electrical equipment.

[0096] As shown in FIG. 4, for example, two terminal devices 100 (100-1) and 100 (100-2) are provided for the higher-level device, and as an example, a single switch SW1 that is closed by a predetermined operation and a terminal block 30 are provided in each terminal device, and an external signal line 102 and an external common line 104 from the higher-level device are connected in stages to the switch SW1 of the terminal device 100 (100-2) via the switch SW1 of the terminal device 100 (100-1).

[0097] Taking the terminal device 100 (100-1) as an example, the terminal block 30 has a configuration in which four terminals are assigned to one switch, with the first terminal A1 and the second terminal A2 assigned to correspond to the switch terminal S11 (first connection point) of the switch SW1, and the third terminal A3 and the fourth terminal A4 assigned to correspond to the switch terminal S12 (second connection point). The same applies to the terminal device 100 (100-2).

[0098] Then, in order to form a loop line for wire break monitoring that runs from the external signal line 102 from the higher-level device to the external common line 104 to the higher-level device via the internal wiring within the terminal devices 100 (100-1) and 100 (100-2), the wiring connections are made as follows.

[0099] In the first-stage terminal device 100 (100-1), the switch terminal S11 of the switch SW1 is connected to the first terminal A1 and the second terminal A2 of the terminal block 30 by individual internal signal lines, and the switch terminal S12 is connected to the third terminal A3 and the fourth terminal A4 of the terminal block 30 by individual internal common lines. A parallel circuit of a relay X and a disconnection indicator light 36 using an LED is connected between the second terminal A2 and the third terminal A3 of the terminal block 30. Furthermore, an external signal line 102 from a higher-level device is connected to the first terminal A1 of the terminal block 30, an external signal line 102 to the next-stage terminal device 100 (100-2) is connected to the second terminal A2 of the terminal block 30, an external common line 104 from the next-stage terminal device 100 (100-2) is connected to the third terminal A3, and an external common line 104 to the higher-level device is connected to the fourth terminal A4 of the terminal block 30.

[0100] In the final-stage terminal device 100 (100-2), the switch terminal S11 of the switch SW1 is connected to the first terminal A1 and the second terminal A2 of the terminal block 30 by separate internal signal lines, and the switch terminal S12 is connected to the third terminal A3 and the fourth terminal A4 of the terminal block 30 by separate internal common lines. An external signal line 102 from the preceding-stage terminal device 100 (100-1) is connected to the first terminal A1 of the terminal block 30, and an external common line 104 to the preceding-stage terminal device 100 (100-1) is connected to the fourth terminal A4 of the terminal block 30. Furthermore, a parallel circuit of a relay X and a disconnection indicator light 36 using an LED is connected between the second terminal A2 and the third terminal A3 of the terminal block 30. The relay X of the final-stage terminal device 100 (100-2) also functions as a terminator. The wiring between the second terminal A2 and the third terminal A3 via the relay X is treated as included in the "internal wiring".

[0101] In addition, in this embodiment, the external signal line 102 from the higher-level device to the first terminal A1 of the terminal block 30 of the terminal device 100 (100-1), each of the internal signal lines from the first terminal A1 of the terminal block 30 of the terminal devices 100 (100-1) and 100 (100-2) to the switch terminal S11 of the switch SW1 provided in the same terminal device, the internal signal line from the second terminal A2 of the terminal block 30 of the terminal device 100 (100-1) to the switch terminal S11 of the switch SW1, and the external signal line 102 from the second terminal A2 of the terminal block 30 of the terminal device 100 (100-1) to the first terminal A1 of the terminal block 30 of the terminal device 100 (100-2) are the "first wiring."

[0102] In addition, the external common line 104 from the higher-level device to the fourth terminal A4 of the terminal block 30 of the terminal device 100 (100-1), each of the internal common lines from the fourth terminal A4 of the terminal block 30 of the terminal devices 100 (100-1) and 100 (100-2) to the switch terminal S12 of the switch SW1 provided in the same terminal device, the internal common line from the third terminal A3 of the terminal block 30 of the terminal device 100 (100-1) to the switch terminal S12 of the switch SW1, and the external common line 104 from the third terminal A3 of the terminal block 30 of the terminal device 100 (100-1) to the fourth terminal A4 of the terminal block 30 of the terminal device 100 (100-2) are the "second wiring."

[0103] In addition, the internal signal line from the second terminal A2 of the terminal block 30 of the terminal device 100 (100-2) to the switch terminal S11 of the switch SW1, the internal common line from the third terminal A3 of the terminal block 30 of the terminal device 100 (100-2) to the switch terminal S12 of the switch SW1, and the internal wiring from the second terminal A2 to the third terminal A3 of the terminal block 30 of the terminal device 100 (100-2) via the relay X constitute the "third wiring."

[0104] This wiring connection forms a loop line from the external signal line 102 from the higher-level device through the internal wiring of the terminal devices 100 (100-1) and 100 (100-2) to the external common line 104 to the higher-level device. The route of the loop line is indicated by symbols as follows: [external signal line 102] - [first terminal A1 of terminal block 30 of terminal device 100 (100-1)] - [switch terminal S11 of switch SW1 of terminal device 100 (100-1)] - [second terminal A2 of terminal block 30 of terminal device 100 (100-1)] - [external signal line 102] - [first terminal A1 of terminal block 30 of terminal device 100 (100-2)] - [switch terminal S11 of switch SW1 of terminal device 100 (100-2)] - [second terminal A2 of terminal block 30 of terminal device 100 (100-2)] - [terminal device 100 ( The order is as follows: [Relay X, disconnection indicator light 36 of terminal device 100 (100-2)] - [third terminal A3 of terminal block 30 of terminal device 100 (100-2)] - [switch terminal S12 of switch SW1 of terminal device 100 (100-2)] - [fourth terminal A4 of terminal block 30 of terminal device 100 (100-2)] - [external common line 104] - [third terminal A3 of terminal block 30 of terminal device 100 (100-1)] - [switch terminal S12 of switch SW1 of terminal device 100 (100-1)] - [fourth terminal A4 of terminal block 30 of terminal device 100 (100-1)] - [external common line 104].

[0105] In addition, the disconnection monitoring from the upper device is performed, for example, by switching the external signal line 102 and the external common line 104 to a line for disconnection monitoring provided by the upper device at predetermined intervals, detecting the disconnection monitoring current flowing through the loop line, and determining that it is normal if it is above or exceeds a predetermined threshold, or determining that it is below or equal to the predetermined threshold, and outputting a disconnection alarm.

[0106] Furthermore, if a break occurs in any of the internal wiring of the terminal device 100 (100-1) due to aging or other reasons, the current flowing through the loop line stops, and the current also stops flowing through the wiring to which the break indicator lights 36 of the terminal devices 100 (100-1) and 100 (100-2) are connected, causing the break indicator lights 36 of the terminal devices 100 (100-1) and 100 (100-2) to go out.

[0107] On the other hand, if a break occurs in any of the internal wiring of the terminal device 100 (100-2) due to aging or the like, the current flowing through the loop line stops, and the current also stops in the wiring to which the break indicator light 36 of the terminal device 100 (100-2) is connected, so the break indicator light 36 of the terminal device 100 (100-2) is turned off. On the other hand, the break indicator light 36 of the terminal device 100 (100-1) is connected to a wiring branched from the wiring extending from the second terminal A2 of the terminal device 100 (100-1) to the first terminal A1 of the terminal device 100 (100-2), so the current does not stop in the wiring to which the break indicator light 36 of the terminal device 100 (100-1) is connected, and the light remains on.

[0108] In other words, by checking the lighting status of the disconnection indicator light 36 provided in the terminal device in the first stage in order from the disconnection indicator light 36 provided in the terminal device in the last stage, if there is a terminal device whose disconnection indicator light 36 is off, it can be determined that there is a disconnection in the internal wiring of that terminal device or in the external wiring connecting that terminal device to the terminal device in the previous stage, and it becomes easy to identify the location of the disconnection from the off state of the disconnection indicator light 36 of the terminal device, and it can also be confirmed on the terminal device.

[0109] [d. Third embodiment of wire breakage monitoring system] Next, a third embodiment of the wire break monitoring system will be described in more detail using an example of a facility in which a plurality of electrical devices arranged in a single terminal device are connected to a higher-level device. Figure 5 shows an example of a wiring circuit diagram of the wire break monitoring system. In addition, the description will be given assuming that wiring is connected to a switch provided in the electrical device.

[0110] As shown in Figure 5, a terminal device 100 is provided for the higher-level device, and for example, two switches SW1 and SW2 that are closed by a predetermined operation and a terminal block 30 are provided in the terminal device 100, and either one of external signal lines 102 and 106 and a common external common line 104 are connected from the higher-level device to each switch SW1 and SW2.

[0111] The terminal block 30 is configured such that four terminals are assigned to one switch, with the first terminal A11 and the second terminal A21 assigned to correspond to the switch terminal S11 (first connection point) of the switch SW1, and the third terminal A3 and the fourth terminal A4 assigned to correspond to the switch terminal S12 (second connection point).

[0112] Similarly, the first terminal A12 and the second terminal A22 of the terminal block 30 are assigned to correspond to the switch terminal S21 (first connection point) of the switch SW2, and since the switch terminal S22 (second connection point) shares the external common line 104 with the switch SW1, the third terminal A3 and the fourth terminal A4 of the terminal block 30 are assigned to the switch SW1.

[0113] In order to form a loop line for wire break monitoring that runs from the external signal line 102 from the upper device via the internal wiring for switch SW1 to the external common line 104 to the upper device, and a loop line for wire break monitoring that runs from the external signal line 106 from the upper device via the internal wiring for switch SW2 to the external common line 104 to the upper device, the wiring connections are made as follows.

[0114] First, in the loop line passing through the internal wiring for switch SW1, switch terminal S11 is connected to the first terminal A11 and the second terminal A21 of terminal block 30 by individual internal signal lines, and switch terminal S12 is connected to the third terminal A3 and the fourth terminal A4 of terminal block 30 by an internal common line shared with switch SW2. Switch terminal S12 is connected to the third terminal A3 of terminal block 30 via switch terminal 22 of switch SW2. An external signal line 102 from a higher-level device is connected to the first terminal A11 of terminal block 30, and an external common line 104 to the higher-level device is connected to the fourth terminal A4. Furthermore, a parallel circuit of relay X and a disconnection indicator light 36 using an LED is connected between the second terminal A21 and the third terminal A3 of terminal block 30. Relay X also functions as a terminator, and the wiring between the second terminal A21 and the third terminal A3 via relay X is treated as part of the "internal wiring."

[0115] In the loop line passing through the internal wiring for switch SW2, switch terminal S21 is connected to the first terminal A12 and the second terminal A22 of terminal block 30 by individual internal signal lines, and switch terminal S22 is connected to the third terminal A3 and the fourth terminal A4 of terminal block 30 by an internal common line common to switch SW1. Switch terminal S22 is connected to the fourth terminal A4 of terminal block 30 via switch terminal 12 of switch SW1. An external signal line 106 from a higher-level device is connected to the first terminal A12 of terminal block 30. Furthermore, a parallel circuit of relay Y and a disconnection indicator light 38 using an LED is connected between the second terminal A22 and the third terminal A3 of terminal block 30. Relay Y also functions as a terminator, and the wiring between the second terminal A22 and the third terminal A3 via relay Y is treated as part of the "internal wiring."

[0116] In addition, in this embodiment, the external signal line 102 from the higher-level device to the first terminal A11 of the terminal block 30, the external signal line 106 from the higher-level device to the first terminal A12 of the terminal block 30, the internal signal line from the first terminal A11 of the terminal block 30 to the switch terminal S11 of the switch SW1, and the internal signal line from the first terminal A12 of the terminal block 30 to the switch terminal S21 of the switch SW2 are the "first wiring."

[0117] In addition, the external common line 104 from the higher-level device to the fourth terminal A4 of the terminal block 30, the internal common line from the fourth terminal A4 of the terminal block 30 to the switch terminal S12 of the switch SW1, and the internal common line from the switch terminal S12 of the switch SW1 to the switch terminal S22 of the switch SW2 are the "second wiring."

[0118] In addition, the internal signal line from the second terminal A21 of the terminal block 30 to the switch terminal S11 of the switch SW1, the internal signal line from the second terminal A22 of the terminal block 30 to the switch terminal S21 of the switch SW2, the internal wiring from the second terminal A21 of the terminal block 30 to the third terminal A3 of the terminal block 30 via the relay X, the internal wiring from the second terminal A22 of the terminal block 30 to the third terminal A3 of the terminal block 30 via the relay Y, and the internal common line from the third terminal A3 of the terminal block 30 to the switch terminal S22 of the switch SW2 are the "third wiring."

[0119] This wiring connection forms a loop line from external signal line 102 from the higher-level device through the internal wiring for switch SW1 to external common line 104 to the higher-level device. The route of the loop line is indicated by symbols as follows: [external signal line 102] - [first terminal A11 of terminal block 30] - [switch terminal S11 of switch SW1] - [second terminal A21 of terminal block 30] - [relay X, open circuit indicator light 36] - [third terminal A3 of terminal block 30] - [switch terminal S22 of switch SW2] - [switch terminal S12 of switch SW1] - [fourth terminal A4 of terminal block 30] - [external common line 104].

[0120] Also, a loop line is formed that runs from the external signal line 106 from the higher-level device through the internal wiring for the switch SW2 to the external common line 104 to the higher-level device. The route of the loop line is indicated by symbols as follows: [external signal line 106] - [first terminal A12 of terminal block 30] - [switch terminal S21 of switch SW2] - [second terminal A22 of terminal block 30] - [relay Y, open circuit indicator light 38] - [third terminal A3 of terminal block 30] - [switch terminal S22 of switch SW2] - [switch terminal S12 of switch SW1] - [fourth terminal A4 of terminal block 30] - [external common line 104].

[0121] In addition, the disconnection monitoring from the upper device is performed, for example, by sequentially switching the connection between the external signal line 102 and the external common line 104 and the connection between the external signal line 106 and the external common line 104 at predetermined intervals to connect them to lines for disconnection monitoring provided by the upper device, detecting the disconnection monitoring current flowing through each loop line, determining that it is normal if it is above or exceeds a predetermined threshold, and determining that it is disconnected if it is below or equal to the predetermined threshold, and outputting a disconnection alarm.

[0122] Furthermore, if a break occurs in one of the internal signal lines for switch SW1 due to deterioration over time or the like, the current flowing in the loop line for switch SW1 stops and the break indicator light 36 goes out, and if a break occurs in one of the internal signal lines for switch SW2 due to deterioration over time or the like, the current flowing in the loop line for switch SW2 stops and the break indicator light 38 goes out.

[0123] On the other hand, if a break occurs in either of the internal common lines shared by switches SW1 and SW2 due to aging or other reasons, the current flowing through the loop line to switches SW1 and SW2 will stop and the break indicator lights 36, 38 will turn off.

[0124] In other words, it is possible to determine which part of the internal wiring has been broken based on the on / off state of the disconnection indicator lights 36, 38, making it easier to identify the location of the break and also making it possible to confirm this on the terminal device 100.

[0125] [e. Fourth embodiment of wire breakage monitoring system] Next, a fourth embodiment of the wire break monitoring system will be described in more detail using an example of a facility in which a plurality of electrical devices arranged in a plurality of terminal devices are connected in stages to a host device. Figure 6 shows an example of a wiring circuit diagram of the wire break monitoring system. In addition, the description will be given assuming that wiring is connected to a switch provided in the electrical device.

[0126] 6, for example, two terminal devices 100 (100-1) and 100 (100-2) are provided for the higher-level device, and as an example, two switches SW1 and SW2 that are closed by a predetermined operation and a terminal block 30 are provided in each terminal device, and external signal lines 102 and 106 and an external common line 104 from the higher-level device are connected in stages to the switches SW1 and SW2 of the terminal device 100 (100-2) via the switches SW1 and SW2 of the terminal device 100 (100-1). Also, in this embodiment, the switch SW1 of the terminal devices 100 (100-1) and 100 (100-2) belongs to one group, and the switch SW2 of the terminal devices 100 (100-1) and 100 (100-2) belongs to another group.

[0127] Taking terminal device 100 (100-1) as an example, terminal block 30 is configured with four terminals assigned to one switch, with first terminal A11 and second terminal A21 assigned to switch terminal S11 (first connection point) of switch SW1, and third terminal A3 and fourth terminal A4 assigned to switch terminal S12 (second connection point).

[0128] Similarly, the first terminal A12 and the second terminal A22 of the terminal block 30 are assigned to correspond to the switch terminal S21 (first connection point) of the switch SW2, and the switch terminal S22 (second connection point) is assigned the third terminal A3 and the fourth terminal A4 of the terminal block 30, which are the same as the switch SW1, since the switch terminal S22 shares the external common line 104 with the switch SW1. The same applies to the terminal device 100 (100-2).

[0129] The following wiring connections are made to form a loop line for wire break monitoring that runs from the external signal line 102 from the higher-level device to the external common line 104 to the higher-level device via internal wiring for switch SW1 of terminal devices 100 (100-1) and 100 (100-2), and a loop line for wire break monitoring that runs from the external signal line 106 from the higher-level device to the external common line 104 to the higher-level device via internal wiring for switch SW2 of terminal devices 100 (100-1) and 100 (100-2).

[0130] First, to form a loop line passing through the internal wiring for the switch SW1 of the terminal devices 100 (100-1) and 100 (100-2), in the first-stage terminal device 100 (100-1), the switch terminal S11 is connected to the first terminal A11 and the second terminal A21 of the terminal block 30 by individual internal signal lines, and the switch terminal S12 is connected to the third terminal A3 and the fourth terminal A4 of the terminal block 30 by an internal common line common to the switch SW2. Note that the connection between the switch terminal S12 and the third terminal A3 of the terminal block 30 is made via the switch terminal 22 of the switch SW2. An external signal line 102 from a higher-level device is connected to the first terminal A11 of the terminal block 30, an external signal line 102 to the next-stage terminal device 100 (100-2) is connected to the second terminal A21 of the terminal block 30, an external common line 104 from the next-stage terminal device 100 (100-2) is connected to the third terminal A3 of the terminal block 30, and an external common line 104 to the higher-level device is connected to the fourth terminal A4. Furthermore, a parallel circuit of a relay X and a disconnection indicator light 36 using an LED is connected between the second terminal A21 and the third terminal A3 of the terminal block 30.

[0131] In the final-stage terminal device 100 (100-2), the switch terminal S11 of the switch SW1 is connected to the first terminal A11 and the second terminal A21 of the terminal block 30 by individual internal signal lines, and the switch terminal S12 is connected to the third terminal A3 and the fourth terminal A4 of the terminal block 30 by an internal common line common to the switch SW2. The connection between the switch terminal S12 and the third terminal A3 of the terminal block 30 is via the switch terminal 22 of the switch SW2. An external signal line 102 from the preceding-stage terminal device 100 (100-1) is connected to the first terminal A11 of the terminal block 30, and an external common line 104 to the preceding-stage terminal device 100 (100-1) is connected to the fourth terminal A4. Furthermore, a parallel circuit of a relay X and a disconnection indicator light 36 using an LED is connected between the second terminal A21 and the third terminal A3 of the terminal block 30. In addition, the relay X is configured to function as a terminator, and the wiring between the second terminal A21 and the third terminal A3 via the relay X is treated as being included in the "internal wiring."

[0132] Next, to form a loop line passing through the internal wiring for the switch SW2 of the terminal devices 100 (100-1) and 100 (100-2), in the first-stage terminal device 100 (100-1), the switch terminal S21 is connected to the first terminal A12 and the second terminal A22 of the terminal block 30 by individual internal signal lines, and the switch terminal S22 is connected to the third terminal A3 and the fourth terminal A4 of the terminal block 30 by an internal common line common to the switch SW1. Note that the connection between the switch terminal S22 and the fourth terminal A4 of the terminal block 30 is made via the switch terminal 12 of the switch SW1. An external signal line 106 from a higher-level device is connected to the first terminal A12 of the terminal block 30, an external signal line 106 to the next-stage terminal device 100 (100-2) is connected to the second terminal A22 of the terminal block 30, an external common line 104 from the next-stage terminal device 100 (100-2) is connected to the third terminal A3 of the terminal block 30, and an external common line 104 to the higher-level device is connected to the fourth terminal A4. Furthermore, a parallel circuit of a relay Y and a disconnection indicator light 38 using an LED is connected between the second terminal A22 and the third terminal A3 of the terminal block 30.

[0133] In the final-stage terminal device 100 (100-2), the switch terminal S21 of the switch SW2 is connected to the first terminal A12 and the second terminal A22 of the terminal block 30 by individual internal signal lines, and the switch terminal S22 is connected to the third terminal A3 and the fourth terminal A4 of the terminal block 30 by an internal common line common to the switch SW1. The switch terminal S22 is connected to the fourth terminal A4 of the terminal block 30 via the switch terminal 12 of the switch SW1. An external signal line 106 from the preceding-stage terminal device 100 (100-1) is connected to the first terminal A12 of the terminal block 30, and an external common line 104 to the preceding-stage terminal device 100 (100-1) is connected to the fourth terminal A4. Furthermore, a parallel circuit of a relay Y and a disconnection indicator light 38 using an LED is connected between the second terminal A22 and the third terminal A3 of the terminal block 30. In addition, the relay Y is configured to function as a terminator, and the wiring between the second terminal A22 and the third terminal A3 via the relay Y is treated as being included in the "internal wiring."

[0134] In this embodiment, an external signal line 102 from the higher-level device to the first terminal A11 of the terminal block 30 of the terminal device 100 (100-1), an external signal line 106 from the higher-level device to the first terminal A12 of the terminal block 30 of the terminal device 100 (100-1), each of the internal signal lines from the first terminal A11 of the terminal block 30 of the terminal devices 100 (100-1), 100 (100-2) to the switch terminal S11 of the switch SW1 provided in the same terminal device, each of the internal signal lines from the first terminal A12 of the terminal block 30 of the terminal devices 100 (100-1), 100 (100-2) to the switch terminal S21 of the switch SW2 provided in the same terminal device, The "first wiring" includes the internal signal line from the second terminal A21 of the terminal block 30 of the terminal device 100 (100-1) to the switch terminal S11 of the switch SW1, the internal signal line from the second terminal A22 of the terminal block 30 of the terminal device 100 (100-1) to the switch terminal S21 of the switch SW2, the external signal line 102 from the second terminal A21 of the terminal block 30 of the terminal device 100 (100-1) to the first terminal A11 of the terminal block 30 of the next terminal device 100 (100-2), and the external signal line 106 from the second terminal A22 of the terminal block 30 of the terminal device 100 (100-1) to the first terminal A12 of the terminal block 30 of the next terminal device 100 (100-2).

[0135] In addition, the external common line 104 from the higher-level device to the fourth terminal A4 of the terminal block 30 of the terminal device 100 (100-1), each of the internal common lines from the fourth terminal A4 of the terminal block 30 of the terminal devices 100 (100-1) and 100 (100-2) to the switch terminal S12 of the switch SW1, each of the internal common lines from the switch terminal S12 of the switch SW1 of the terminal devices 100 (100-1) and 100 (100-2) to the switch terminal S22 of the switch SW2, the internal common line from the third terminal A3 of the terminal block 30 of the terminal device 100 (100-1) to the switch terminal S22 of the switch SW2, and the external common line 104 from the third terminal A3 of the terminal block 30 of the terminal device 100 (100-1) to the fourth terminal A4 of the terminal block 30 of the next-stage terminal device 100 (100-2) are the "second wiring."

[0136] In addition, the internal signal line from the second terminal A21 of the terminal block 30 of the terminal device 100 (100-2) to the switch terminal S11 of the switch SW1, the internal signal line from the second terminal A22 of the terminal block 30 of the terminal device 100 (100-2) to the switch terminal S21 of the switch SW2, the internal common line from the third terminal A3 of the terminal block 30 of the terminal device 100 (100-2) to the switch terminal S22 of the switch SW2, the internal wiring from the second terminal A21 to the third terminal A3 of the terminal block 30 of the terminal device 100 (100-2) via the relay X, and the internal wiring from the second terminal A22 to the third terminal A3 of the terminal block 30 of the terminal device 100 (100-2) via the relay Y are the "third wiring."

[0137] This wiring connection forms a loop line from the external signal line 102 from the host device through the internal wiring for the switch SW1 of the terminal devices 100 (100-1) and 100 (100-2) to the external common line 104 to the host device. The route of the loop line is indicated by symbols as follows: [external signal line 102] - [first terminal A11 of terminal block 30 of terminal device 100 (100-1)] - [switch terminal S11 of switch SW1 of terminal device 100 (100-1)] - [second terminal A21 of terminal block 30 of terminal device 100 (100-1)] - [external signal line 102] - [first terminal A11 of terminal block 30 of terminal device 100 (100-2)] - [switch terminal S11 of switch SW1 of terminal device 100 (100-2)] - [second terminal A21 of terminal block 30 of terminal device 100 (100-2)] - [relay X, disconnection indicator light 36 of terminal device 100 (100-2)] - [terminal device 100 (100 -2)]-[switch terminal S22 of switch SW2 of terminal device 100 (100-2)]-[switch terminal S12 of switch SW1 of terminal device 100 (100-2)]-[fourth terminal A4 of terminal block 30 of terminal device 100 (100-2)]-[external common line 104]-[third terminal A3 of terminal block 30 of terminal device 100 (100-1)]-[switch terminal S22 of switch SW2 of terminal device 100 (100-1)]-[switch terminal S12 of switch SW1 of terminal device 100 (100-1)]-[fourth terminal A4 of terminal block 30 of terminal device 100 (100-1)]-[external common line 104].

[0138] Also, a loop line is formed from the external signal line 106 from the host device through the internal wiring for the switch SW2 of the terminal devices 100 (100-1) and 100 (100-2) to the external common line 104 to the host device. The route of the loop line is indicated by symbols as follows: [external signal line 106] - [first terminal A12 of terminal block 30 of terminal device 100 (100-1)] - [switch terminal S21 of switch SW2 of terminal device 100 (100-1)] - [second terminal A22 of terminal block 30 of terminal device 100 (100-1)] - [external signal line 106] - [first terminal A12 of terminal block 30 of terminal device 100 (100-2)] - [switch terminal S21 of switch SW2 of terminal device 100 (100-2)] - [second terminal A22 of terminal block 30 of terminal device 100 (100-2)] - [relay Y, disconnection indicator light 38 of terminal device 100 (100-2)] - [terminal device 100 (100 -2)]-[switch terminal S22 of switch SW2 of terminal device 100 (100-2)]-[switch terminal S12 of switch SW1 of terminal device 100 (100-2)]-[fourth terminal A4 of terminal block 30 of terminal device 100 (100-2)]-[external common line 104]-[third terminal A3 of terminal block 30 of terminal device 100 (100-1)]-[switch terminal S22 of switch SW2 of terminal device 100 (100-1)]-[switch terminal S12 of switch SW1 of terminal device 100 (100-1)]-[fourth terminal A4 of terminal block 30 of terminal device 100 (100-1)]-[external common line 104].

[0139] The disconnection monitoring from the upper device is performed, for example, by sequentially switching the connection between the external signal line 102 and the external common line 104 and the connection between the external signal line 106 and the external common line 104 at predetermined intervals to connect them to lines for disconnection monitoring provided by the upper device, detecting the disconnection monitoring current flowing through each loop line, determining that it is normal if it is above or exceeds a predetermined threshold, and determining that it is disconnected if it is below or equal to the predetermined threshold, and outputting a disconnection alarm.

[0140] Furthermore, since this embodiment is a combination of the second and third embodiments, it is possible to obtain the effects of both the second and third embodiments with regard to line breakage indication.

[0141] [f. Specific embodiment of tunnel emergency equipment using a wire breakage monitoring system] A specific embodiment of the wire break monitoring system for emergency tunnel facilities in which a plurality of fire hydrant devices are connected to the disaster prevention receiving panel shown in FIG. 1 will be described in more detail.

[0142] The tunnel emergency equipment in Figure 1 has four fire hydrant devices functioning as terminal devices connected in stages to a disaster prevention receiving panel functioning as a higher-level device, and the electrical equipment connected to the wiring to be monitored and arranged on the terminal device includes a transmitter 24, a pump start push button 32, and a pump start interlocking device 34, so the fourth embodiment of the wire break monitoring system is applied.

[0143] In addition, this explanation will be given with reference to Figure 7, which shows a wiring circuit diagram of the first stage fire hydrant device 10 (10-1), Figure 8, which shows a wiring circuit diagram of the last stage fire hydrant device 10 (10-4), and Figure 9, which shows a wiring circuit diagram for the transmitter 24, pump start push button 32, and pump start interlocking device 34 in the first and last stage fire hydrant devices of Figures 7 and 8.

[0144] (f1. Wiring circuit of the first stage fire hydrant device) The wiring circuit of the first-stage fire hydrant device 10 (10-1) will be described in more detail. As shown in Fig. 7, the first-stage fire hydrant device 10 (10-1) is provided with electrical equipment such as a telephone jack 28, a transmitter 24, a response lamp 26, a pump start push button 32, and a pump start interlocking device 34. Of these, the electrical equipment connected to the wiring monitored by the wire breakage monitoring system is the transmitter 24, the pump start push button 32, and the pump start interlocking device 34. Here, the switch provided on the transmitter 24 is shown as switch SW1 in Fig. 6 showing the fourth embodiment of the wire breakage monitoring system, the switch provided on the pump start push button 32 is shown as switch SW2 in Fig. 6, and the switch of the pump start interlocking device 34 connected in parallel to the switch provided on the pump start push button 32 is shown as SW3.

[0145] The pump start push button 32 and the switches SW2 and SW3 of the pump start interlocking device 34 are connected in parallel and are treated as a single switch in the loop line for wire breakage monitoring. The transmitter 24 is also provided with a switch SW4 that is interlocked with the push button operation.

[0146] The terminal device 10 (10-1) is provided with a terminal block 30, and the terminal block 30 is assigned a terminal to be used for each electrical device, with terminals T1, T2, TC1, TC2 assigned to the telephone jack 28, terminals M1, M2, MC3, MC4 assigned to the switch SW1 of the transmitter 24, terminals MF1, MF2, FC1, FC2 assigned to the response lamp 26 and switch SW4 of the transmitter, and terminals HA1, HA2, MC3, MC4 assigned to the pump start push button 32 and switches SW2, SW3 of the pump start interlocking device 34.

[0147] Furthermore, a manual notification line M, a manual notification common line MC, a pump start line HA, a response line MF, a response common line FC, a telephone line T, and a telephone common line TC are drawn out from the disaster prevention receiving panel 12 and connected to the terminal block 30. To clarify the correspondence between the signal lines and the terminals, the alphabetical symbols of the signal lines and the terminal block are made to match.

[0148] 6, terminal M1 corresponds to the first terminal A11 in FIG. 6, terminal M2 corresponds to the second terminal A21 in FIG. 6, terminal MC3 corresponds to the third terminal A3 in FIG. 6, terminal MC4 corresponds to the fourth terminal A4 in FIG. 6, terminal HA1 corresponds to the first terminal A12 in FIG. 6, terminal HA2 corresponds to the second terminal A22 in FIG. 6, manual communication line M corresponds to the external signal line 102 in FIG. 6, manual communication common line MC corresponds to the external common line 104 in FIG. 6, and pump start line HA corresponds to the external signal line 106 in FIG. 6.

[0149] The disaster prevention receiving panel 12 is provided with a disconnection monitoring unit 40, which detects the disconnection monitoring current flowing in the loop line from the manual notification line M from the disaster prevention receiving panel 12 via the internal wiring for switch SW1 of the transmitter 24 to the manual notification common line MC to the disaster prevention receiving panel 12, and in the loop line from the pump start line HA from the disaster prevention receiving panel 12 via the internal wiring for switch SW2 of the pump start push button 32 and switch SW3 of the pump start interlocking device 34 to the manual notification common line MC to the disaster prevention receiving panel 12 by switching the connected loop lines at predetermined intervals, and monitors whether or not there is a disconnection in each loop line.

[0150] The wiring circuit of the loop line formed for this disconnection monitoring is the same as the wiring circuit of the first-stage terminal device 100 (10-1) shown in the fourth embodiment of Fig. 6, except that switch SW3 is connected in parallel to switch SW2 and diodes D1 and D2 are connected in parallel to relays X and Y. Therefore, it is denoted by the same reference numerals as in Fig. 6. Note that diodes D1 and D2 are provided for the purpose of preventing damage to relays X and Y due to surge voltages.

[0151] The wiring circuit specific to the fire hydrant device that does not exist in the disconnection monitoring system of Figure 6 is the wiring circuit related to the response lamp 26 and telephone jack 28. The wiring circuit of the response lamp 26 is a circuit of [response line MF] - [terminals MF1, MF2] - [response lamp 26] - [switch SW4 of transmitter 24] - [terminals FC1, FC2] - [response common line FC], and the response lamp 26 lights up in response to a response signal from the disaster prevention receiving panel 12, provided that switch SW4 is closed in conjunction with the operation of the push button on the transmitter 24. In addition, the response line MF connected to the next-stage fire hydrant device 10 (10-2) is connected to terminal MF2, and the response common line FC connected to the next-stage fire hydrant device 10 (10-2) is connected to terminal FC2.

[0152] The wiring circuit of the telephone jack 28 is a circuit of [telephone line T] - [terminals T1, T2] - [telephone jack 28] - [terminals TC1, TC2] - [telephone common line TC], and when the user plugs in the handset they carry to the telephone jack 28, a call current flows and a call is made to the disaster prevention receiving panel 12, and when the user picks up the handset on the disaster prevention receiving panel 12 side, the call connection is established. In addition, the telephone line T that connects to the next stage fire hydrant device 10 (10-2) is connected to terminal T2, and the telephone common line TC that connects to the next stage fire hydrant device 10 (10-2) is connected to terminal TC2.

[0153] In addition, in this embodiment, a line breakage reporting unit is configured that uses the telephone line T and the telephone common line TC to report to the disaster prevention receiving panel 12 that a line breakage has occurred in the loop line that passes through the internal wiring of the fire hydrant device 10 (10-1).

[0154] The disconnection notification unit connects a normally closed contact X4 of relay X, which is provided in correspondence with the loop line that passes through the internal wiring for switch SW1 of transmitter 24, and a normally closed contact Y4 of relay Y, which is provided in correspondence with the loop line that passes through the internal wiring for switch SW2 of pump start push button 32 and SW3 of pump start interlocking device 34, in parallel between terminals T1 and TC2, i.e., to telephone jack 28, via dummy resistor 44.

[0155] For this reason, if a break occurs in the internal wiring of the fire hydrant device 10 (10-1) and the current to relay X or relay Y stops, operation of relay X or relay Y stops, the normally closed contact X4 or Y4 when not energized closes, and a dummy resistor 44 equivalent to the resistance when a handset is connected to the telephone jack 28 is connected between the telephone line T and the telephone common line TC, causing a call current to flow and sending a pseudo call signal as a break-in notification signal to the disaster prevention receiving panel 12. In this case, even if the handset is picked up at the disaster prevention receiving panel 12, there is no call, so the person in charge knows that an abnormality, including a break in the wire, has occurred on the fire hydrant device side and can take action such as checking the site.

[0156] In addition, the wire break reporting unit may be configured such that a dedicated wire break reporting line and its common line are drawn out from the disaster prevention receiving panel 12 to the fire hydrant device and connected, and the normally closed contacts X4 and Y4 of relay X and relay Y when not energized are connected in parallel between the wire break reporting line and its common line, thereby enabling the wire break reporting signal to be transmitted.

[0157] (f2. Wiring circuit of the final stage fire hydrant device) The wiring circuit of the final-stage fire hydrant device 10 (10-4) will now be described. As shown in Figure 8, the final-stage fire hydrant device 10 (10-4) has basically the same electrical equipment and wiring configuration as the first-stage fire hydrant device 10 (10-1) shown in Figure 7, but differs in that there is no next-stage fire hydrant device, and therefore the external wiring to the next stage is omitted. Therefore, the same reference numerals as in Figure 7 will be used, and their description will be omitted.

[0158] (f3. Loop line monitored for breaks) We will now explain in more detail the loop line formed for wire break monitoring in tunnel emergency equipment, in which the first stage fire hydrant device 10 (10-1) in Figure 7 to the final stage fire hydrant device 10 (10-4) in Figure 8 are connected in stages to the disaster prevention receiving panel 12.

[0159] Figure 9 shows the wiring circuit of the loop line that is the target of wire breakage monitoring for the first and last stage fire hydrant devices 10 (10-1) and 10 (10-4). Note that the fire hydrant devices 10 (10-2) and 10 (10-3) connected between the first and last stages are omitted.

[0160] In FIG. 9, the loop line from the manual notification line M from the disaster prevention receiving panel 12 to the manual notification common line MC to the disaster prevention receiving panel 12 via the internal wiring for the switch SW1 of the transmitter 24 of the first stage fire hydrant device 10 (10-1) to the last stage fire hydrant device 10 (10-4) is shown by the connection of symbols as follows: [manual notification line M] - [terminal M1 of the terminal block 30 of the fire hydrant device 10 (10-1)] - [fire hydrant device 10 (10-4)]. 0-1)] - [Terminal M2 of the terminal block 30 of the hydrant device 10 (10-1)] - [Manual notification line M] - (omitted) - [Terminal M1 of the terminal block 30 of the terminal block 30 of the hydrant device 10 (10-4)] - [Terminal S11 of the switch SW1 of the hydrant device 10 (10-4)] - [Terminal M2 of the terminal block 30 of the hydrant device 10 (10-4)] - [Relay X of the hydrant device 10 (10-4), open circuit Indicator light 36] - [Terminal MC3 of the terminal block 30 of the hydrant device 10 (10-4)] - [Terminal S31 of the switch SW3 of the hydrant device 10 (10-4)] - [Terminal S22 of the switch SW2 of the hydrant device 10 (10-4)] - [Terminal S12 of the switch SW1 of the hydrant device 10 (10-4)] - [Terminal MC4 of the terminal block 30 of the hydrant device 10 (10-4)] - [Manual notification common line MC] - (omitted) - [fire A loop line is formed from the terminal MC3 of the terminal block 30 of the hydrant device 10 (10-1) - the terminal S31 of the switch SW3 of the hydrant device 10 (10-1) - the terminal S22 of the switch SW2 of the hydrant device 10 (10-1) - the terminal S12 of the switch SW1 of the hydrant device 10 (10-1) - the terminal MC4 of the terminal block 30 of the hydrant device 10 (10-1) - the manual notification common line MC. Note that (omitted) indicates the parts of the hydrant devices 10 (10-2) and 10 (10-3) that are not shown.

[0161] In addition, the loop line from the pump start line HA from the disaster prevention receiving panel 12 to the manual notification common line MC to the disaster prevention receiving panel 12 via all the internal wiring for the switch SW2 of the pump start push button 32 of the first stage fire hydrant device 10 (10-1) to the last stage fire hydrant device 10 (10-4) and the switch SW3 of the pump start interlocking device 34 is shown by the connection of symbols as follows: [pump start line HA] - [terminal HA1 of the terminal block 30 of the fire hydrant device 10 (10-1)] - [fire Terminal S21 of switch SW2 of fire hydrant device 10 (10-1) - [Terminal S32 of switch SW3 of fire hydrant device 10 (10-1)] - [Terminal HA2 of terminal block 30 of fire hydrant device 10 (10-1)] - [Pump starting line HA] - (omitted) - [Terminal HA1 of terminal block 30 of fire hydrant device 10 (10-4)] - [Terminal S21 of switch SW2 of fire hydrant device 10 (10-4)] - [Terminal S32 of switch SW3 of fire hydrant device 10 (10-4)] - [Fire hydrant device 10 (10-4) terminal block 30] - [fire hydrant device 10 (10-4) relay Y, disconnection indicator light 38] - [fire hydrant device 10 (10-4) terminal MC3] - [fire hydrant device 10 (10-4) switch SW3 terminal S31] - [fire hydrant device 10 (10-4) switch SW2 terminal S22] - [fire hydrant device 10 (10-4) switch SW1 terminal S12] - [fire hydrant device 10 (10-4) terminal block 30 terminal MC A loop line is formed from the terminal block 30 of the hydrant device 10 (10-1) to the terminal S31 of the switch SW3 of the hydrant device 10 (10-1) to the terminal S22 of the switch SW2 of the hydrant device 10 (10-1) to the terminal S12 of the switch SW1 of the hydrant device 10 (10-1) to the terminal MC4 of the terminal block 30 of the hydrant device 10 (10-1) to the manual reporting common line MC. Note that the (omitted) indicates the parts of the hydrant devices 10 (10-2) and 10 (10-3) that are not shown.

[0162] In addition, the disconnection monitoring unit 40 of the disaster prevention receiving panel 12, which functions as a higher-level device, sequentially switches the connection between the manual reporting line M and the manual reporting common line MC and the connection between the pump start line HA and the manual reporting common line MC at predetermined intervals, detects the disconnection monitoring current flowing through each loop line, and determines that it is normal if it is above or exceeds a predetermined threshold, or determines that it is disconnected if it is below or equal to the predetermined threshold, and outputs a disconnection alarm.

[0163] Furthermore, since the fourth embodiment is a combination of the second and third embodiments, the effects of both the second and third embodiments can be obtained with regard to line breakage indication.

[0164] [g. Fail-safe circuit] A fail-safe circuit that reforms a loop line when a break occurs in the internal wiring that is part of the loop line, thereby maintaining functions other than those of electrical equipment connected to the internal wiring where the break occurs, will be described in more detail below, divided into the break monitoring systems of the second embodiment, the fourth embodiment, and the embodiment applied to emergency tunnel equipment.

[0165] [h. Fail-safe circuit of second embodiment] The fail-safe circuit provided in the second embodiment of the wire breakage monitoring system will be described in more detail below with reference to Fig. 10, which is a wiring circuit diagram in which a fail-safe circuit is provided in the second embodiment of the wire breakage monitoring system of Fig. 4.

[0166] As shown in Fig. 10, an external signal line 102 and an external common line 104 from a disconnection monitoring unit 40 provided in a higher-level device 110 are connected in stages to a switch SW1 of a terminal device 100 (100-2) via a switch SW1 of a terminal device 100 (100-1). The second embodiment shown in Fig. 10 is obtained by adding a fail-safe circuit to the second embodiment shown in Fig. 4, and the circuit configuration of the terminal devices 100 (100-1) and 100 (100-2) other than the fail-safe circuit is basically the same as that of the second embodiment shown in Fig. 4, so the same reference numerals are used and their description will be omitted.

[0167] In order to function as a fail-safe circuit, taking the terminal device 100 (100-1) as an example, a relay X is connected between the second terminal A2 and the third terminal A3 of the terminal block 30 so as to be connected to the second terminal A2 via its own normally open contact X3 when not energized, a normally closed contact X1 when not energized of the relay X is connected between the first terminal A1 and the second terminal A2 of the terminal block 30, and a normally closed contact X2 when not energized of the relay X is connected between the third terminal A3 and the fourth terminal A4 of the terminal block 30. An external relay control line 108 drawn from the upper device 110 is connected to the second terminal A2 side of the terminal block 30 of the relay X, and an external relay control line 108 to the relay X of the terminal device 100 (100-2) at the next stage is also connected.

[0168] The fail-safe circuit of terminal device 100 (100-2) also has a circuit configuration that is basically the same as that of terminal device 100 (100-1), but differs in that the external relay control line to the next stage is omitted because there is no next-stage terminal device.

[0169] The host device 110 is provided with, for example, an operation switch 112 having a non-locking structure, and an external relay control line 108 is connected via the operation switch 112 to a power supply line that has a predetermined power supply voltage (+Vc).

[0170] Next, the operation of the second embodiment of the disconnection monitoring system including the fail-safe circuit will be described in more detail. When the upper device 110 is started to start operation of the equipment of the second embodiment in Fig. 10, a predetermined power supply voltage (+Vc) is supplied between the external signal line 102 and the external common line 104 drawn from the disconnection monitoring unit 40.

[0171] However, since the relay X of the terminal devices 100 (100-1) and 100 (100-2) is connected to the terminal A2 of the terminal block 30 via the normally open contact X3 when not energized, it cannot receive power supply via the external signal line 102 and does not operate.

[0172] For this reason, when starting operation of the equipment, the operation switch 112 of the higher-level device 110 is turned on once, and power is temporarily supplied to the relays X of the terminal devices 100 (100-1) and 100 (100-2) via the external relay control line 108, activating them. This activates the relays X, closing the normally open contact X3 when de-energized, so that the relays X can receive power via the external signal line 102. After that, the operation switch 112 is turned off, but even if the power supply via the external relay control line 108 is cut off, the power supply via the external signal line 102 continues, so the operating state of the relays X is maintained.

[0173] Furthermore, when the operation switch 112 of the higher-level device 110 is turned on and power supply via the external relay control line 108 is started, the normally closed contacts X1 and X2 of the relay X when not energized are opened, and even if the operation switch 112 is subsequently turned off, the operating state of the relay X is maintained, so the normally closed contacts X1 and X2 of the relay X when not energized are maintained in the open state.

[0174] This forms a loop line from the external signal line 102 from the upper device 110 that is the target of disconnection monitoring, via the internal wiring of the terminal devices 100 (100-1) and 100 (100-2), to the external common line 104 to the upper device 110, and the upper device 110 enters a disconnection monitoring state.

[0175] Furthermore, when a break occurs in the loop line during operation and the break is repaired, the upper device 110 is restarted, and the operation switch 112 is turned on to activate the relay X in the same manner as when starting operation of the facility, and then the operation switch 112 is turned off, thereby forming the loop line that is the subject of break monitoring again.

[0176] Next, a fail-safe operation when a break occurs in the internal wiring of the terminal devices 100 (100-1) and 100 (100-2) will be described in more detail.

[0177] For example, suppose that a break occurs in the internal wiring between the switch terminal S11 of the switch SW1 of the terminal device 100 (100-1) and the terminal A2 of the terminal block 30. This break will cut the loop line, so the operation of the relay X of the terminal device 100 (100-1) will stop and the normally closed contacts X1 and X2 will close, and the normally closed contact X1 will bypass between the first terminal A1 and the second terminal A2, and the normally closed contact X2 will bypass between the third terminal A3 and the fourth terminal A4, thereby reforming the loop line and disconnecting the internal wiring for the switch SW1 of the terminal device 100 (100-1) where the break occurred.

[0178] Furthermore, when the operation of the relay X stops, the normally open contact X3 when de-energized opens, cutting off the connection between the relay X and the second terminal A2 of the terminal block 30, and the normally closed contacts X1 and X2 when de-energized close to re-form the loop line, even if the relay X does not operate again. Therefore, the normally closed contacts X1 and X2 when de-energized do not open again, maintaining the re-formed loop line, and making it possible to maintain the function of the switch SW1 of the terminal device 100 (100-2) in which no break has occurred in the internal wiring.

[0179] Furthermore, the relay X of the terminal device 100 (100-2) in the second embodiment functions as a terminator. However, if a break occurs in the internal wiring of the terminal device 100 (100-2), the relay X of the terminal device 100 (100-2) is disconnected from the loop line. Therefore, a termination resistor, for example, that functions as a terminator may be provided in the wiring on the side of the break indicator lamp 36 that is connected in parallel to the relay X between the second terminal A2 and the third terminal A3 of the terminal block 30.

[0180] [i. Fail-safe circuit of the fourth embodiment] The fail-safe circuit provided in the fourth embodiment of the wire breakage monitoring system will be described in more detail below with reference to Fig. 11, which is a wiring circuit diagram in which a fail-safe circuit is provided in the fourth embodiment of the wire breakage monitoring system of Fig. 6.

[0181] As shown in Fig. 11, external signal lines 102, 106 and an external common line 104 from a disconnection monitoring unit 40 provided in a higher-level device 110 are connected in stages to corresponding switches SW1, SW2 of a terminal device 100 (100-2) via corresponding switches SW1, SW2 of a terminal device 100 (100-1). Also, the fourth embodiment shown in Fig. 11 is obtained by adding a fail-safe circuit to the fourth embodiment shown in Fig. 6, and the circuit configuration of the terminal devices 100 (100-1) and 100 (100-2) other than the fail-safe circuit is basically the same as that of the fourth embodiment in Fig. 6, so the same reference numerals are used and their description will be omitted.

[0182] In order to function as a fail-safe circuit, taking the terminal device 100 (100-1) as an example, a relay X is connected between the second terminal A21 and the third terminal A3 of the terminal block 30 so as to be connected to the second terminal A21 via its own normally open contact X3 when not energized, a normally closed contact X1 when not energized of the relay X is connected between the first terminal A11 and the second terminal A21 of the terminal block 30, and a normally closed contact X2 when not energized of the relay X is connected between the third terminal A3 and the fourth terminal A4 of the terminal block 30.

[0183] In addition, a relay Y is connected between the second terminal A22 and the third terminal A3 of the terminal block 30 so as to be connected to the second terminal A22 via its own normally open contact Y3 when not energized, and the normally closed contact Y1 when not energized of the relay Y is connected between the first terminal A12 and the second terminal A22 of the terminal block 30.

[0184] Furthermore, the second terminal A21 side of the terminal block 30 of the relay X is connected to an external relay control line 108 drawn from the higher-level device 110, and is also connected to a relay control line to the relay Y. Furthermore, the second terminal A22 side of the terminal block 30 of the relay Y is connected to a relay control line from the relay X, and is also connected to an external relay control line 108 to the relay X of the terminal device 100 (100-2) at the next stage.

[0185] The fail-safe circuit of terminal device 100 (100-2) also has a circuit configuration that is basically the same as that of terminal device 100 (100-1), but differs in that the external relay control line to the next stage is omitted because there is no next-stage terminal device.

[0186] The host device 110 is provided with, for example, an operation switch 112 having a non-locking structure, and an external relay control line 108 is connected via the operation switch 112 to a power supply line that has a predetermined power supply voltage (+Vc).

[0187] Next, the operation of the fourth embodiment of the disconnection monitoring system including the fail-safe circuit will be described in more detail. When the host device 110 is started to start operation of the equipment of the fourth embodiment in Fig. 11, a predetermined power supply voltage (+Vc) is supplied between the external signal lines 102 and 106 and the common line 104 drawn from the disconnection monitoring unit 40.

[0188] However, since the relays X of the terminal devices 100 (100-1) and 100 (100-2) are connected to the second terminal A21 of the terminal block 30 via the normally open contact X3 when not energized, they cannot receive power via the external signal line 102 and do not operate. The same is true for the relays Y of the terminal devices 100 (100-1) and 100 (100-2), which are connected to the second terminal A22 of the terminal block 30 via the normally open contact Y3 when not energized and therefore cannot receive power via the external signal line 106 and do not operate.

[0189] For this reason, when starting operation of the equipment, the operation switch 112 of the higher-level device 110 is turned on once, and power is temporarily supplied to and activated by the relays X and Y of the terminal devices 100 (100-1) and 100 (100-2) via the external relay control line 108. This activates the relays X and Y, closing the normally open contacts X3 and Y3 when de-energized, allowing the relays X and Y to receive power via either the external signal lines 102 and 106. After that, the operation switch 112 is turned off, but even if the power supply via the external relay control line 108 is cut off, the power supply via the external signal lines 102 and 106 continues, so the activated state of the relays X and Y is maintained.

[0190] Furthermore, when the operation switch 112 of the higher-level device 110 is turned on and the supply of power via the external relay control line 108 is started, the normally closed contacts X1 and X2 of relay X and the normally closed contact Y1 of relay Y are opened, and even if the operation switch 112 is subsequently turned off, the operating states of relays X and Y are maintained, so the normally closed contacts X1 and X2 of relay X and the normally closed contact Y1 of relay Y are maintained in the open state.

[0191] This forms a loop line from the external signal line 102 from the upper device 110 that is the target of disconnection monitoring, via the internal wiring for the switch SW1 of the terminal devices 100 (100-1) and 100 (100-2), to the external common line 104 to the upper device 110, and a loop line from the external signal line 106 from the upper device 110, via the internal wiring for the switch SW2 of the terminal devices 100 (100-1) and 100 (100-2), to the external common line 104 to the upper device 110, and the upper device 110 enters a disconnection monitoring state.

[0192] Furthermore, if a break occurs in the loop line during operation and the break is repaired, the upper device 110 is restarted, and the operation switch 112 is turned on to activate relays X and Y in the same way as when starting operation of the equipment, and then the operation switch 112 is turned off, thereby forming the loop line that is the subject of break monitoring again.

[0193] [j. Fail-safe operation in the event of a wire break in the fourth embodiment] Next, the fail-safe operation when a break occurs in the internal wiring of the terminal devices 100 (100-1) and 100 (100-2) will be described in more detail using the example of a break in the internal wiring of the terminal device 100 (100-1). The fail-safe operation when a break occurs in the internal wiring can be divided into the following three cases:

[0194] Case 1 is when the internal wiring in the path [first terminal A11 of terminal block 30] - [switch terminal S11 of switch SW1] - [second terminal A21 of terminal block 30] is broken. In this case, the power supply to relay X via external signal line 102 is cut off, and operation of relay X stops.

[0195] Case 2 is when the internal wiring in the path [first terminal A12 of terminal block 30] - [switch terminal S21 of switch SW2] - [second terminal A22 of terminal block 30] is broken. In this case, the power supply to relay Y via external signal line 106 is cut off, and operation of relay Y stops.

[0196] Case 3 is when the internal wiring in the path [third terminal A3 of terminal block 30] - [switch terminal S22 of switch SW2] - [switch terminal S12 of switch SW1] - [fourth terminal A4 of terminal block 30] is broken. In this case, the path to the external common wire 104 of relays X and Y is broken, and operation of relays X and Y stops.

[0197] (j1. Fail-safe operation in case of internal wiring breakage in Case 1) As an example of a disconnection in the internal wiring in Case 1, let us assume that the internal wiring between the first terminal A11 of the terminal block 30 of the terminal device 100 (100-1) and the switch terminal S11 of the switch SW1 is disconnected. This disconnection breaks the loop line to the switch SW1, so the operation of the relay X of the terminal device 100 (100-1) stops and the normally closed contacts X1 and X2 when de-energized are closed, and the normally closed contact X1 when de-energized bypasses between the first terminal A11 and the second terminal A21, and the normally closed contact X2 when de-energized bypasses between the third terminal A3 and the fourth terminal A4, thereby reforming the loop line, and the internal wiring to the switch SW1 of the terminal device 100 (100-1) where the disconnection occurred is disconnected.

[0198] Furthermore, when the operation of the relay X stops, the normally open contact X3 when de-energized opens, cutting off the connection between the relay X and the second terminal A21 of the terminal block 30, and the normally closed contacts X1 and X2 when de-energized close to re-form the loop line, even if the relay X does not operate again. Therefore, the normally closed contacts X1 and X2 when de-energized do not open again, maintaining the re-formed loop line, and making it possible to maintain the function of the switch SW1 of the terminal device 100 (100-2) in which no break has occurred in the internal wiring.

[0199] Furthermore, since a break in the internal wiring in Case 1 does not affect the loop line for switch SW2, even if a break in the internal wiring in Case 1 occurs, the function of switch SW2 in all terminal devices is maintained.

[0200] (j2. Case 2: Fail-safe operation when internal wiring is broken) As an example of a disconnection in the internal wiring in Case 2, let us assume that the internal wiring between the first terminal A12 of the terminal block 30 of the terminal device 100 (100-1) and the switch terminal S21 of the switch SW2 is disconnected. This disconnection breaks the loop line to the switch SW2, so the operation of the relay Y of the terminal device 100 (100-1) stops and the normally closed contact Y1 when de-energized closes, and the normally closed contact Y1 when de-energized bypasses between the first terminal A12 and the second terminal A22, thereby reforming the loop line and disconnecting the internal wiring to the switch SW2 of the terminal device 100 (100-1) where the disconnection occurred.

[0201] Furthermore, when the operation of relay Y stops, the normally open contact Y3 when de-energized opens, cutting off the connection between relay Y and the second terminal A22 of the terminal block 30, and the normally closed contact Y1 when de-energized closes, so even if the loop line is reformed again, relay Y will not operate again, and the normally closed contact Y1 when de-energized will not open again, maintaining the reformed loop line and making it possible to maintain the function of switch SW2 of terminal device 100 (100-2) in which no break has occurred in the internal wiring.

[0202] Furthermore, since a break in the internal wiring in Case 2 does not affect the loop line for switch SW1, even if a break in the internal wiring in Case 2 occurs, the function of switch SW1 in all terminal devices is maintained.

[0203] (j3. Fail-safe operation in case of internal wiring breakage in Case 3) As an example of a disconnection in the internal wiring in Case 3, let us assume that the internal wiring between the switch terminal S12 of the switch SW1 of the terminal device 100 (100-1) and the fourth terminal A4 of the terminal block 30 is disconnected. This disconnection breaks the loop line to the switch SW1, so the operation of the relay X of the terminal device 100 (100-1) stops and the normally closed contacts X1 and X2 when de-energized are closed, and the normally closed contact X1 when de-energized bypasses between the first terminal A11 and the second terminal A21, and the normally closed contact X2 when de-energized bypasses between the third terminal A3 and the fourth terminal A4, thereby reforming the loop line and disconnecting the internal wiring to the switch SW1 of the terminal device 100 (100-1) where the disconnection occurred.

[0204] Furthermore, when the operation of the relay X stops, the normally open contact X3 when de-energized opens, cutting off the connection between the relay X and the second terminal A21 of the terminal block 30, and the normally closed contacts X1 and X2 when de-energized close to re-form the loop line, even if the relay X does not operate again. Therefore, the normally closed contacts X1 and X2 when de-energized do not open again, maintaining the re-formed loop line, and making it possible to maintain the function of the switch SW1 of the terminal device 100 (100-2) in which no break has occurred in the internal wiring.

[0205] In addition, this break also cuts the loop line to switch SW2, so the operation of relay Y of terminal device 100 (100-1) stops and the normally closed contact Y1 when not powered closes, and the normally closed contact Y1 when not powered bypasses between the first terminal A12 and the second terminal A22, thereby reforming the loop line and disconnecting the internal wiring to switch SW2 of terminal device 100 (100-1) where the break occurred.

[0206] Furthermore, when the operation of relay Y stops, the normally open contact Y3 when de-energized opens, cutting off the connection between relay Y and the second terminal A22 of the terminal block 30, and the normally closed contact Y1 when de-energized closes, so even if the loop line is reformed again, relay Y will not operate again, and the normally closed contact Y1 when de-energized will not open again, maintaining the reformed loop line and making it possible to maintain the function of switch SW2 of terminal device 100 (100-2) in which no break has occurred in the internal wiring.

[0207] Furthermore, the relays X and Y of the terminal device 100 (100-2) in the fourth embodiment are configured to function as terminators, but since the relays X and Y are disconnected from the loop line when the fail-safe function is activated, it is possible to provide, for example, a terminating resistor that functions as a terminator, in the wiring on the side of the disconnection indicator light 36 that is connected in parallel to the relay X between the second terminal A21 and the third terminal A3 of the terminal block 30, and in the wiring on the side of the disconnection indicator light 38 that is connected in parallel to the relay Y between the second terminal A22 and the third terminal A3 of the terminal block 30.

[0208] [k. Fail-safe circuit in a modified example of the fourth embodiment] A modification of the fourth embodiment that includes a fail-safe circuit will be described in more detail. In the fourth embodiment of the disconnection monitoring system shown in Fig. 11, the switch terminal S12 of the switch SW1 and the switch terminal S22 of the switch SW2 provided in the terminal devices 100 (100-1) and 100 (100-2) are connected by internal wiring, and the switch terminal S12 of the switch SW1 is connected to the fourth terminal A4 of the terminal block 30, thereby providing a common connection to the external common line 104 from the higher-level device 110, but individual external common lines may be provided for each of the switches SW1 and SW2.

[0209] FIG. 12 shows a wiring circuit diagram of a wire breakage monitoring system that is a modification of the fourth embodiment in which individual external common lines are provided for the switches SW1 and SW2.

[0210] The difference from the fourth embodiment shown in FIG. 11 is that an external common line 104a is drawn from the host device 110 corresponding to the switch SW1, and another external common line 104b is drawn from the host device 110 corresponding to the switch SW2.

[0211] In addition, in the terminal device 100 (100-1), the switch terminal S12 of the switch SW1 and the switch terminal S22 of the switch SW2 are not connected by internal wiring, but the switch terminal S12 of the switch SW1 is connected to the third terminal A31 and the fourth terminal A41 of the terminal block 30 by individual internal common lines, and the switch terminal S22 of the switch SW2 is connected to the third terminal A32 and the fourth terminal A42 of the terminal block 30 by individual internal common lines.

[0212] Furthermore, an external common line 104a from a fourth terminal A41 of the terminal block 30 of the next-stage terminal device 100 (100-2) is connected to the third terminal A31 of the terminal block 30, and the external common line 104a to the higher-level device 110 is connected to the fourth terminal A41. Furthermore, an external common line 104b from a fourth terminal A42 of the terminal block 30 of the next-stage terminal device 100 (100-2) is connected to the terminal A32 of the terminal block 30, and the external common line 104b to the higher-level device 110 is connected to the fourth terminal A42.

[0213] 11 except that the symbol of the third terminal to which it is connected has been changed to "A31." However, the connection of relay Y differs in that it is connected between the second terminal A22 and the third terminal A32 of the terminal block 30 and that the normally closed contact Y2 when de-energized of relay Y is connected between the third terminal A32 and the fourth terminal A42 of the terminal block 30.

[0214] In the areas where changes have been made by providing individual external common lines for each switch, the circuit configuration of the final stage terminal device 100 (100-2) is basically the same as that of the first stage terminal device 100 (100-1), but differs in that the external common line to the next stage is eliminated because there is no next stage terminal device.

[0215] In this embodiment, the fail-safe operation when the internal wiring is broken is as follows, taking the case where a break occurs in the internal wiring of the terminal device 100 (100-1) as an example. First, if the internal wiring for the switch SW1 of the terminal device 100 (100-1) is broken, the loop line for the switch SW1 is broken, so the operation of the relay X of the terminal device 100 (100-1) stops and the normally closed contacts X1 and X2 when de-energized are closed. The normally closed contact X1 when de-energized bypasses between the first terminal A11 and the second terminal A21, and the normally closed contact X2 when de-energized bypasses between the third terminal A31 and the fourth terminal A41, thereby reforming the loop line, and the internal wiring for the switch SW1 of the terminal device 100 (100-1) where the break occurred is disconnected.

[0216] Furthermore, when the operation of the relay X stops, the normally open contact X3 when de-energized opens, cutting off the connection between the relay X and the second terminal A21 of the terminal block 30, and the normally closed contacts X1 and X2 when de-energized close to re-form the loop line, even if the relay X does not operate again. Therefore, the normally closed contacts X1 and X2 when de-energized do not open again, maintaining the re-formed loop line, and making it possible to maintain the function of the switch SW1 of the terminal device 100 (100-2) in which no break has occurred in the internal wiring.

[0217] Even if the loop line for switch SW1 is broken, it does not affect the loop line for switch SW2, so the function of switch SW2 of all terminal devices is maintained.

[0218] Furthermore, if the internal wiring for switch SW2 of terminal device 100 (100-1) is broken, the loop line for switch SW2 will be cut off, so that relay Y of terminal device 100 (100-1) stops operating and the normally closed contacts Y1 and Y2 when not energized are closed, and the normally closed contact Y1 when not energized bypasses between the first terminal A12 and the second terminal A22, and the normally closed contact Y2 when not energized bypasses between the third terminal A32 and the fourth terminal A42, thereby reforming the loop line and disconnecting the internal wiring for switch SW2 of terminal device 100 (100-1) where the break occurred.

[0219] Furthermore, when the operation of relay Y stops, the normally open contact Y3 when de-energized opens, cutting off the connection between relay Y and the second terminal A22 of terminal block 30, and the normally closed contacts Y1 and Y2 when de-energized close to re-form the loop line, but relay Y will not operate again. Therefore, the normally closed contacts Y1 and Y2 when de-energized do not open again, maintaining the re-formed loop line and enabling the function of switch SW2 of terminal device 100 (100-2) to be maintained even if no break has occurred in the internal wiring.

[0220] Even if the loop line for switch SW2 is broken, it does not affect the loop line for switch SW1, so the function of switch SW1 in all terminal devices is maintained.

[0221] In this modified example of the fourth embodiment, the external common lines for switches SW1 and SW2 are separate wires, which separates the fail-safe operation against a break in the internal wiring for switch SW1 from the fail-safe operation against a break in the internal wiring for switch SW2, making it possible to reliably maintain the functionality of the switches connected to internal wiring that is not broken.

[0222] [l. Fail-safe circuit for wire breakage monitoring system in emergency facilities for tunnels] A more detailed explanation will be given of the fail-safe circuit provided in the embodiment of the wire breakage monitoring system applied to the tunnel emergency facility in Fig. 1. This explanation will be made with reference to Fig. 13, which shows a wiring circuit diagram of the first-stage fire hydrant device, Fig. 14, which shows a wiring circuit diagram of the last-stage fire hydrant device, and Fig. 15, which shows a wiring circuit diagram for the transmitter 24, pump start push button 32, and pump start interlocking device 34 in the first-stage and last-stage fire hydrant devices in Figs. 13 and 14.

[0223] As shown in Figures 13 and 14, in this embodiment, the disconnection monitoring system in which the fail-safe circuit of Figure 11 is provided is applied to the tunnel emergency facility of Figure 1, that is, the fail-safe circuit of Figure 11 is provided to each fire hydrant device of the tunnel emergency facility of Figures 7 and 8, so the same reference numerals are used for the circuit configuration and their explanation will be omitted. The reference numeral for the external relay control line is "RL."

[0224] (l1. Fail-safe operation when the internal wiring of the fire hydrant device is broken) The fail-safe operation when the internal wiring of the fire hydrant devices 10 (10-1) to 10 (10-4) is broken can be explained as follows, taking the case where a break occurs in the internal wiring of the fire hydrant device 10 (10-1) as an example, and dividing it into cases 1 to 3 as in the fourth embodiment described above.

[0225] Case 1 is when the internal wiring is broken in the path [terminal M1 of terminal block 30] - [switch terminal S11 of switch SW1 of transmitter 24] - [terminal M2 of terminal block 30]. In this case, the power supply to relay X via manual communication line M is cut off, and operation of relay X stops.

[0226] Case 2 is when the internal wiring is broken in the path from [terminal HA1 of terminal block 30] - [switch terminal S21 of switch SW2 of pump start push button 32] - [switch terminal S32 of switch SW3 of pump start interlocking device 34] - [terminal HA2 of terminal block 30].In this case, the power supply to relay Y via the pump start line HA is cut off, and operation of relay Y stops.

[0227] Case 3 is when the internal wiring is broken in the path from [terminal MC3 of terminal block 30] - [switch terminal S31 of switch SW3 of pump start interlocking device 34] - [switch terminal S22 of switch SW2 of pump start push button 32] - [switch terminal S12 of switch SW1 of transmitter 24] - [terminal MC4 of terminal block 30].In this case, the path to the manual notification common line MC of relays X and Y is broken, and operation of relays X and Y stops.

[0228] (l2.Fail-safe operation in case of internal wiring breakage in case 1) As an example of a disconnection in the internal wiring in Case 1, let us assume that the internal wiring between terminal M1 of the terminal block 30 of the fire hydrant device 10 (10-1) and switch terminal S11 of the switch SW1 of the transmitter 24 is disconnected. This disconnection breaks the loop line to switch SW1, so the operation of relay X of the fire hydrant device 10 (10-1) stops and the normally closed contacts X1 and X2 when de-energized are closed, and the normally closed contact X1 when de-energized bypasses between terminals M1 and M2, and the normally closed contact X2 when de-energized bypasses between terminals MC3 and MC4, thereby reforming the loop line and disconnecting the internal wiring to switch SW1 of the fire hydrant device 10 (10-1) where the disconnection occurred.

[0229] Furthermore, when the operation of the relay X stops, the normally open contact X3 when de-energized opens, cutting off the connection between the relay X and terminal M2 of the terminal block 30, and the normally closed contacts X1 and X2 when de-energized close to re-form the loop line, even if the relay X does not operate again. Therefore, the normally closed contacts X1 and X2 when de-energized do not open again, maintaining the re-formed loop line, and making it possible to maintain the function of the transmitter 24 equipped with the switch SW1 of the fire hydrant devices 10 (10-2) to 10 (10-4) in which no breaks have occurred in the internal wiring.

[0230] Furthermore, since a break in the internal wiring of case 1 does not affect the loop line for switches SW2 and SW3, even if a break occurs in the internal wiring of case 1, the functions of the pump start push button 32 equipped with switch SW2 of the fire hydrant device and the pump start interlocking device 34 equipped with switch SW3 are maintained.

[0231] (l3. Case 2: Fail-safe operation when internal wiring is broken) As an example of a disconnection in the internal wiring in Case 2, let us assume that the internal wiring between terminal HA1 of the terminal block 30 of the fire hydrant device 10 (10-1) and switch terminal S21 of switch SW2 of the pump start interlocking device 34 is disconnected. This disconnection breaks the loop line to switches SW2 and SW3, so the operation of relay Y of the fire hydrant device 10 (10-1) stops and the normally closed contact Y1 when de-energized closes, and the normally closed contact Y1 when de-energized bypasses between terminals HA1 and HA2, thereby reforming the loop line and disconnecting the internal wiring to switches SW2 and SW3 of the fire hydrant device 10 (10-1) where the disconnection occurred.

[0232] Furthermore, when the operation of relay Y stops, the normally open contact Y3 when de-energized opens, cutting off the connection between relay Y and terminal HA2 of terminal block 30, and even if the normally closed contact Y1 when de-energized closes and the loop line is reformed again, relay Y will not operate again, so the normally closed contact Y1 when de-energized will not open again and the reformed loop line will be maintained, making it possible to maintain the function of the pump start push button 32 equipped with switch SW2 and the pump start interlocking device 34 equipped with switch SW3 of fire hydrant devices 10 (10-2) to 10 (10-4) where no breaks have occurred in the internal wiring.

[0233] Furthermore, since a break in the internal wiring in case 2 does not affect the loop line to switch SW1, even if a break in the internal wiring in case 2 occurs, the functionality of all transmitters 24 equipped with switch SW1 of the fire hydrant device is maintained.

[0234] (l4. Case 3: Fail-safe operation in case of internal wiring breakage) As an example of a disconnection in the internal wiring in Case 3, let us assume that the internal wiring between the switch terminal S12 of the switch SW1 of the transmitter 24 provided in the fire hydrant device 10 (10-1) and the terminal MC4 of the terminal block 30 is disconnected. This disconnection breaks the loop line to the switch SW1, so the operation of the relay X of the fire hydrant device 10 (10-1) stops and the normally closed contacts X1 and X2 when de-energized are closed, and the normally closed contact X1 when de-energized bypasses between terminals M1 and M2, and the normally closed contact X2 when de-energized bypasses between terminals MC3 and MC4, thereby reforming the loop line and disconnecting the internal wiring to the switch SW1 of the fire hydrant device 10 (10-1) where the disconnection occurred.

[0235] Furthermore, when the operation of the relay X stops, the normally open contact X3 when de-energized opens, cutting off the connection between the relay X and terminal M2 of the terminal block 30, and the normally closed contacts X1 and X2 when de-energized close to re-form the loop line, even if the relay X does not operate again. Therefore, the normally closed contacts X1 and X2 when de-energized do not open again, maintaining the re-formed loop line, and making it possible to maintain the function of the transmitter 24 equipped with the switch SW1 of the fire hydrant devices 10 (10-2) to 10 (10-4) in which no breaks have occurred in the internal wiring.

[0236] In addition, this disconnection also cuts the loop line to switches SW2 and SW3, causing relay Y of fire hydrant device 10 (10-1) to stop operating and closing contact Y1 when de-energized. The normally closed contact Y1 when de-energized then bypasses between terminals HA1 and HA2, thereby reforming the loop line and disconnecting the internal wiring to switches SW2 and SW3 of fire hydrant device 10 (10-1) where the disconnection occurred.

[0237] Furthermore, when the operation of relay Y stops, the normally open contact Y3 when de-energized opens, cutting off the connection between relay Y and terminal HA2 of terminal block 30, and even if the normally closed contact Y1 when de-energized closes and the loop line is reformed again, relay Y will not operate again, so the normally closed contact Y1 when de-energized will not open again and the reformed loop line will be maintained, making it possible to maintain the function of the pump start push button 32 equipped with switch SW2 and the pump start interlocking device 34 equipped with switch SW3 of fire hydrant devices 10 (10-2) to 10 (10-4) where no breaks have occurred in the internal wiring.

[0238] Although the above description has been given in connection with the application of the fourth embodiment of the disconnection monitoring system provided with the fail-safe circuit shown in Figure 11, it is also possible to apply a modified example of the fourth embodiment of the disconnection monitoring system provided with a fail-safe circuit in which the external common wires for the switch SW1 of the transmitter 24, the pump start push button 32, and the switches SW2 and SW3 of the pump start interlocking device 34 are separate external common wires, as shown in Figure 12.

[0239] [m. Fail-safe circuit that enables identification of broken wire location] Here, in the second and fourth embodiments of the disconnection monitoring system that does not have the fail-safe circuit described above, the disconnection indicator lights 36, 38 of the terminal devices that are next in line to the terminal device where the disconnection occurred are also turned off, so the number of terminal devices that have the disconnection indicator lights 36, 38 turned off is not necessarily limited to just one, and it is necessary to check the lighting status in order from the terminal device in the first line to the terminal device in the last line.Although the location where the disconnection occurred can be identified by the disconnection indicator lights 36, 38, this checking process remains cumbersome.

[0240] Furthermore, in the second and fourth embodiments of the disconnection monitoring system equipped with the fail-safe circuit described above, if a disconnection occurs in any of the terminal devices, the loop line is re-formed by the fail-safe circuit, so the disconnection indicator lights 36, 38 that were once turned off due to the disconnection will turn on again, and it will not be possible to identify the location of the disconnection from the disconnection indicator lights 36, 38 of each terminal device.

[0241] Furthermore, in a tunnel emergency facility to which the fourth embodiment of the wire breakage monitoring system equipped with a fail-safe circuit is applied, if a wire breakage occurs in any of the hydrant devices, a momentary power outage will occur due to the wire breakage, and the relays X and Y provided in the fire hydrant devices next to and after the one where the wire breakage occurred will also stop operating in the same way as the relays X and Y provided in the fire hydrant device where the wire breakage occurred, and the normally closed contacts X4 and Y4 when not energized provided in the relays X and Y connected to the telephone line T and telephone common line TC will close, and a wire breakage transfer signal will be sent to the disaster prevention receiving panel 12 from each of the fire hydrant devices from the fire hydrant device where the wire breakage occurred to the final fire hydrant device, making it difficult to identify the location where the wire breakage occurred.

[0242] Therefore, we will explain in more detail an embodiment in which a fail-safe circuit is provided in the second and fourth embodiments of the wire break monitoring system, allowing wire breaks to be indicated by a disconnection indicator light while facilitating the confirmation process, and even in equipment equipped with a wire break notification unit such as emergency tunnel equipment, a wire break notification signal is sent only from the terminal device where the wire break has occurred, making it possible to identify the location of the wire break.

[0243] (m1. Fail-safe circuit that enables identification of the disconnection position in the second embodiment) First, in describing the second embodiment that includes a fail-safe circuit that can identify the location of a broken wire, reference will be made to FIG. 16, which is a wiring circuit diagram in which the second embodiment of the broken wire monitoring system of FIG. 4 is provided with a fail-safe circuit that can display a broken wire.

[0244] As shown in FIG. 16, the circuit configuration of the terminal devices 100 (100-1) and 100 (100-2) other than the fail-safe circuit is basically the same as that of the second embodiment in which the fail-safe circuit shown in FIG. 10 is provided. Therefore, the same reference numerals are used and their explanation is omitted. Regarding the fail-safe circuit, the differences from the fail-safe circuit in FIG. 10 will be explained.

[0245] The terminal device 100 (100-1) differs from Fig. 10 in that the disconnection indicator light 36 is connected to the second terminal A2 via the normally open contact X3 of the relay X when not energized, similar to the relay X. The terminal device 100 (100-2) also differs from Fig. 10 in that the disconnection indicator light 36 is connected to the second terminal A2 of the terminal block 30 via the normally open contact X3 of the relay X when not energized, similar to the terminal device 100 (100-1), that an internal wire is added between the second terminal A2 and terminal A3 of the terminal block 30, and that a delay circuit, which is an RC circuit composed of a capacitor 114 and a resistor 118, is provided between the normally open contact X3 of the relay X when not energized and the third terminal A3 of the terminal block 30.

[0246] Here, the delay circuit is a circuit for supplying power from the capacitor 114 to the relay X of the terminal device 100 (100-2) so that operation of the relay X does not stop during the period from when the break occurs in the internal wiring of the terminal device 100 (100-1) until the loop line is re-formed by the fail-safe circuit of the terminal device 100 (100-1) after the break occurs in the terminal device 100 (100-1). Note that any circuit configuration may be used as long as the delay circuit can supply power to the relay X of the terminal device 100 (100-2) so that operation of the relay X of the terminal device 100 (100-2) does not stop during the period from when the break occurs in the terminal device 100 (100-1) until the loop line is re-formed by the fail-safe circuit of the terminal device 100 (100-1).

[0247] In addition, the internal wiring between the second terminal A2 and terminal A3 of the terminal block 30 added to the terminal device 100 (100-2) is wiring to prevent a situation in which, if a break occurs in the internal wiring of the terminal device 100 (100-2), causing the operation of the relay X of the terminal device 100 (100-2) to stop and the normally open contact X3 when no power is applied to open, the wiring connecting the second terminal A2 and terminal A3 of the terminal block 30 of the terminal device 100 (100-2) will be lost and the loop line will not be able to be re-formed.

[0248] Next, a fail-safe operation that enables a wire breakage indication when a wire breakage occurs in the internal wiring of the terminal devices 100 (100-1) and 100 (100-2) will be described. Note that the basic fail-safe operation is similar to that of the fail-safe circuit shown in Fig. 10, so its explanation will be omitted and only the wire breakage indication accompanying the fail-safe operation will be described.

[0249] If a break occurs in the internal wiring of the terminal device 100 (100-1), for example, in the internal wiring between the switch terminal S11 of the switch SW1 of the terminal device 100 (100-1) and the terminal A2 of the terminal block 30, the relay X of the terminal device 100 (100-1) stops operating and the normally open contact X3 of the relay X of the terminal device 100 (100-1) when no current is applied opens, so that the break indicator light 36 of the terminal device 100 (100-1) goes out. On the other hand, the relay X of the terminal device 100 (100-2) does not stop operating and maintains its operating state due to the power supply from the capacitor 114 of the delay circuit of the terminal device 100 (100-2) from the time the break occurs in the terminal device 100 (100-1) until the loop line is re-formed by the fail-safe circuit of the terminal device 100 (100-1). Therefore, the normally open contact X3 of the relay X of the terminal device 100 (100-2) when not energized does not open, and the break indicator light 36 of the terminal device 100 (100-2) remains lit.

[0250] Furthermore, when a break occurs in the internal wiring of the terminal device 100 (100-2), for example, in the internal wiring between the switch terminal S11 of the switch SW1 of the terminal device 100 (100-2) and the terminal A2 of the terminal block 30, the relay X of the terminal device 100 (100-2) maintains an operating state from the time the break occurs in the internal wiring until the power supply voltage supplied from the capacitor 114 of the delay circuit of the terminal device 100 (100-2) falls below the voltage (operating voltage) for operating the relay X. However, when the power supply voltage supplied from the capacitor 114 falls below the operating voltage of the relay X, the relay X stops operating and the non-energized normally open contact X3 opens, so that the break indicator light 36 of the terminal device 100 (100-2) goes out. On the other hand, since the relay X of the terminal device 100 (100-1) can operate without being affected by the disconnection of the internal wiring in the terminal device 100 (100-2), the disconnection indicator light 36 of the terminal device 100 (100-1) will remain lit.

[0251] In other words, by providing the fail-safe circuit of this embodiment, only the disconnection indicator light 36 of the terminal device in which a disconnection has occurred is turned off, and the disconnection indicator light 36 of the terminal device in which no disconnection has occurred remains on. This makes it possible to display a disconnection even when a fail-safe circuit is provided, and because the disconnection indicator light 36 is turned off only in the terminal device in which a disconnection has occurred, there is no need to check the on state of the terminal devices in order from the first stage, and it is possible to identify the location of the disconnection just by the off state of the disconnection indicator light 36 of the terminal device in which a disconnection has occurred.

[0252] Furthermore, although Figure 16 shows an example in which there are two terminal devices, if electrical equipment is installed in three or more terminal devices, the fail-safe circuit of terminal device 100 (100-1) in Figure 16 is applied to the first-stage terminal device, and the fail-safe circuit of terminal device 100 (100-2) in Figure 16 is applied to terminal devices other than the first-stage terminal device.

[0253] The delay circuit provided in the terminal device to which the fail-safe circuit of terminal device 100 (100-2) in Figure 16 is applied has a time constant that increases from the terminal device next to the first-stage terminal device toward the terminal device that is the final-stage terminal device. In other words, the capacitance of capacitor 114 and the resistance value of resistor 118 are determined so that the time from the occurrence of a disconnection until the power supply voltage supplied from capacitor 114 of the delay circuit falls below the operating voltage of relay X is longer than that of the delay circuit of the terminal device before it and shorter than that of the delay circuit of the terminal device after it.

[0254] As a result, when a break occurs in the internal wiring of a specific terminal device provided with a fail-safe circuit including a delay circuit, the operation of the relay X provided in the terminal device next to or subsequent to the terminal device where the break occurred will not be stopped before the operation of the relay X of the terminal device where the break occurred stops, and the operation of the relay X can be stopped correctly only in the terminal device where the break occurred.

[0255] (m2. Fail-safe circuit that enables identification of the disconnection position in the fourth embodiment) Next, in describing a fourth embodiment that includes a fail-safe circuit that can identify the location of a broken wire, reference will be made to FIG. 17, which is a wiring circuit diagram in which the fourth embodiment of the broken wire monitoring system of FIG. 6 is provided with a fail-safe circuit that can identify the location of a broken wire.

[0256] As shown in FIG. 17, the circuit configuration of the terminal devices 100 (100-1) and 100 (100-2) other than the fail-safe circuit is basically the same as that of the fourth embodiment in which the fail-safe circuit shown in FIG. 11 is provided. Therefore, the same reference numerals are used and their explanation is omitted. Regarding the fail-safe circuit, the differences from the fail-safe circuit in FIG. 11 will be explained.

[0257] The terminal device 100 (100-1) differs from FIG. 11 in that the disconnection indicator light 36 is connected to the second terminal A21 of the terminal block 30 via the normally open contact X3 of the relay X when not energized, similar to the relay X, and the disconnection indicator light 38 is connected to the second terminal A22 of the terminal block 30 via the normally open contact Y3 of the relay Y when not energized, similar to the relay Y. 11 in that the terminal device 100 (100-2) is different from the terminal device 100 (100-1) in that the disconnection indicator light 36 is connected to the second terminal A21 of the terminal block 30 via the normally open contact X3 of the relay X when not energized, and the disconnection indicator light 38 is connected to the second terminal A22 of the terminal block 30 via the normally open contact Y3 of the relay Y when not energized, that one internal wire is added between the second terminal A21 and terminal A3 of the terminal block 30 and between the second terminal A22 and third terminal A3 of the terminal block 30, that an RC delay circuit consisting of a capacitor 114 and a resistor 118 is provided between the normally open contact X3 of the relay X when not energized and the third terminal A3 of the terminal block 30, and that another RC delay circuit consisting of a capacitor 116 and a resistor 120 is provided between the normally open contact Y3 of the relay Y when not energized and the third terminal A3 of the terminal block 30.

[0258] Next, a fail-safe operation that enables a wire breakage indication when a wire breakage occurs in the internal wiring of the terminal devices 100 (100-1) and 100 (100-2) will be described. Note that the basic fail-safe operation is similar to that of the fail-safe circuit shown in Fig. 11, so its explanation will be omitted and only the wire breakage indication accompanying the fail-safe operation will be described.

[0259] In the case of a break in the internal wiring of the terminal device 100 (100-1) in case 1 of the fourth embodiment described above, for example, if the internal wiring between the first terminal A11 of the terminal block 30 of the terminal device 100 (100-1) and the switch terminal S11 of the switch SW1 is broken, the relay X of the terminal device 100 (100-1) stops operating and the normally open contact X3 of the relay X when not energized is opened, so that the break indicator light 36 of the terminal device 100 (100-1) goes out. On the other hand, the relay X of the terminal device 100 (100-2) maintains its operating state without stopping due to the power supply from the capacitor 114 of the delay circuit of the terminal device 100 (100-2) from the time the break occurs in the terminal device 100 (100-1) until the loop line is re-formed by the fail-safe circuit of the terminal device 100 (100-1), so the normally open contact X3 when not energized of the relay X of the terminal device 100 (100-2) does not open and the break indicator light 36 of the terminal device 100 (100-2) remains lit. Also, since the break in the internal wiring of Case 1 does not affect the loop line for the switch SW2, the break indicator lights 38 of the terminal devices 100 (100-1) and 100 (100-2) remain lit.

[0260] Furthermore, in the case of a break in the internal wiring of case 2 of the fourth embodiment described above in the terminal device 100 (100-1), for example, if the internal wiring between the first terminal A12 of the terminal block 30 of the terminal device 100 (100-1) and the switch terminal S21 of the switch SW2 is broken, the relay Y of the terminal device 100 (100-1) stops operating and the normally open contact Y3 of the relay Y when not energized is opened, so that the broken wire indicator light 38 of the terminal device 100 (100-1) goes out. On the other hand, the relay Y of the terminal device 100 (100-2) maintains its operating state without stopping due to the power supply from the capacitor 116 of the delay circuit of the terminal device 100 (100-2) from the time the break occurs in the terminal device 100 (100-1) until the loop line is re-formed by the fail-safe circuit of the terminal device 100 (100-1), so the normally open contact Y3 of the relay Y of the terminal device 100 (100-2) when not energized does not open, and the break indicator light 38 of the terminal device 100 (100-2) remains lit. Also, since the break in the internal wiring of case 2 does not affect the loop line for the switch SW1, the break indicator lights 36 of the terminal devices 100 (100-1) and 100 (100-2) remain lit.

[0261] Furthermore, in the case of a break in the internal wiring of the terminal device 100 (100-1) in case 3 of the fourth embodiment described above, for example, if the internal wiring between the switch terminal S12 of the switch SW1 of the terminal device 100 (100-1) and the fourth terminal A4 of the terminal block 30 is broken, the relays X and Y of the terminal device 100 (100-1) will stop operating and the normally open contacts X3 and Y3 of the relays X and Y when not energized will open, and the break indicator lights 36 and 38 of the terminal device 100 (100-1) will turn off. On the other hand, the relays X and Y of the terminal device 100 (100-2) maintain their operating state without being stopped by the power supply from the capacitors 116 and 118 of the delay circuit of the terminal device 100 (100-2) from the time when the break occurs in the terminal device 100 (100-1) until the loop line is re-formed by the fail-safe circuit of the terminal device 100 (100-1). Therefore, the normally open contacts X3 and Y3 of the relays X and Y of the terminal device 100 (100-2) when not energized do not open, and the break indicator lights 36 and 38 of the terminal device 100 (100-2) maintain their lit state.

[0262] Furthermore, for example, if a break occurs in the internal wiring of case 1 in the terminal device 100 (100-2), the relay X of the terminal device 100 (100-2) maintains an operating state from the time the break occurs until the power supply voltage supplied from the capacitor 114 of the delay circuit of the terminal device 100 (100-2) falls below the operating voltage of the relay X. However, when the power supply voltage supplied from the capacitor 114 falls below the operating voltage of the relay X, the relay X stops operating and the normally open contact X3 when no current is applied opens, so that the break indicator light 36 of the terminal device 100 (100-2) goes out. On the other hand, since the relay X of the terminal device 100 (100-1) can operate without being affected by a broken internal wiring in the terminal device 100 (100-2), the broken wire indicator light 36 of the terminal device 100 (100-1) remains lit, and since the broken internal wiring in the case 1 does not affect the loop line to the switch SW2, the broken wire indicator light 38 of the terminal devices 100 (100-1) and 100 (100-2) remains lit.

[0263] Furthermore, for example, if a break occurs in the internal wiring of case 2 in terminal device 100 (100-2), relay Y of terminal device 100 (100-2) will maintain an operating state from the time the break occurs until the power supply voltage supplied from capacitor 116 of the delay circuit of terminal device 100 (100-2) falls below the operating voltage of relay Y. However, when the power supply voltage supplied from capacitor 116 falls below the operating voltage of relay Y, it will stop operating and the normally open contact Y3 when not energized will open, causing the break indicator light 38 of terminal device 100 (100-2) to go out. On the other hand, since relay Y of terminal device 100 (100-1) can operate without being affected by a broken internal wiring in terminal device 100 (100-2), the broken wire indicator light 38 of terminal device 100 (100-1) remains lit, and since the broken internal wiring in case 2 does not affect the loop line to switch SW1, the broken wire indicator light 36 of terminal devices 100 (100-1) and 100 (100-2) remains lit.

[0264] Furthermore, for example, if a break occurs in the internal wiring of case 3 in the terminal device 100 (100-2), the relays X and Y of the terminal device 100 (100-2) maintain an operating state from the time the break occurs in the internal wiring until the power supply voltage supplied from the capacitors 114 and 116 of the delay circuit of the terminal device 100 (100-2) falls below the operating voltage of the relays X and Y. However, when the power supply voltage supplied from the capacitors 114 and 116 falls below the operating voltage of the relays X and Y, they stop operating and the normally open contacts X3 and Y3 when de-energized are opened, so the break indicator lights 36 and 38 of the terminal device 100 (100-2) are turned off. On the other hand, the relays X and Y of the terminal device 100 (100-1) can operate without being affected by the break in the internal wiring of the terminal device 100 (100-2), so the break indicator lights 36 and 38 of the terminal device 100 (100-1) maintain an on state.

[0265] That is, by providing the fail-safe circuit of this embodiment, only the disconnection indicator lights 36, 38 of the terminal device in which a disconnection has occurred change from an on state to an off state, while the disconnection indicator lights 36, 38 of the terminal devices in which no disconnection has occurred remain on, and furthermore, the on state of the disconnection indicator lights 36, 38 differs depending on Cases 1 to 3. As a result, even when a fail-safe circuit is provided, it is possible to indicate a disconnection, and since the disconnection indicator lights 36, 38 change from an on state to an off state only in the terminal device in which a disconnection has occurred, there is no need to check the on state of the terminal devices in order starting from the first stage, and it is possible to identify the location of the disconnection just by the off state of the disconnection indicator lights 36, 38 of the terminal device in which a disconnection has occurred.

[0266] Furthermore, the fail-safe circuit of the modified example of the fourth embodiment shown in Fig. 12 may be configured to be able to identify the location of a broken wire. Since the loop line for switch SW1 and the loop line for switch SW2 are independent, in this case, when a break occurs in the internal wiring for switch SW1, only the broken wire indicator light 36 of the terminal device in which the break occurs is turned off, and when a break occurs in the internal wiring for switch SW2, only the broken wire indicator light 38 of the terminal device in which the break occurs is turned off.

[0267] Also, while Figure 17 shows an example in which there are two terminal devices, if electrical equipment is installed in three or more terminal devices, the fail-safe circuit of terminal device 100 (100-1) in Figure 17 is applied to the first-stage terminal device, and the fail-safe circuit of terminal device 100 (100-2) in Figure 17 is applied to terminal devices other than the first-stage terminal device.

[0268] The delay circuit provided in the terminal device to which the fail-safe circuit of terminal device 100 (100-2) in Figure 17 is applied is provided in the terminal device that is the next stage after the first stage terminal device, so the time constant becomes larger toward the final stage terminal device.In other words, the capacitance of capacitors 114, 116 and the resistance values ​​of resistors 118, 120 are determined so that the time from the occurrence of a break until the power supply voltage supplied from capacitors 114, 116 of the delay circuit falls below the operating voltage of relays X, Y is longer than that of the delay circuit of the terminal device before it and shorter than that of the delay circuit of the terminal device after it.

[0269] As a result, when a break occurs in the internal wiring of a predetermined terminal device provided with a fail-safe circuit having a delay circuit, the operation of relays X and Y of terminal devices subsequent to the terminal device where the break occurred will not be stopped before the operation of relays X and Y of the terminal device where the break occurred is stopped, and the operation of relays X and Y can be stopped correctly only in the terminal device where the break occurred.

[0270] (m3. Fail-safe circuit that enables identification of broken wire location applied to emergency equipment in tunnels) Next, we will explain in more detail the fail-safe circuit that makes it possible to identify the location of a broken wire when applied to the tunnel emergency equipment in Fig. 1. In this explanation, we will refer to Fig. 18, which shows a wiring circuit diagram of the first-stage fire hydrant device, Fig. 19, which shows a wiring circuit diagram of the last-stage fire hydrant device, and Fig. 20, which shows a wiring circuit diagram for the transmitter 24, pump start push button 32, and pump start interlocking device 34 in the first-stage and last-stage fire hydrant devices in Figs. 18 and 19.

[0271] As shown in Figures 18 to 20, this is basically the same as the emergency tunnel equipment equipped with the fail-safe circuit shown in Figures 13 to 15, and the difference is that the fail-safe circuit of the fourth embodiment is applied, which makes it possible to identify the location of a broken wire. Therefore, explanations of the circuit configuration of the emergency tunnel equipment, basic fail-safe operation, and broken wire indication accompanying the fail-safe operation will be omitted, and only the broken wire notification accompanying the fail-safe operation will be explained.

[0272] If a break occurs in the internal wiring of case 1 in the fire hydrant device 10 (10-1) of Figure 1, for example, if the internal wiring between terminal M1 of the terminal block 30 of the fire hydrant device 10 (10-1) and switch terminal S11 of the switch SW1 of the transmitter 24 is broken, the relay X of the fire hydrant device 10 (10-1) will stop operating and the normally closed contact X4 of the relay X when not energized will close, and a break notification signal will be sent from the fire hydrant device 10 (10-1) to the disaster prevention receiving panel 12. On the other hand, the relays X of the fire hydrant devices 10 (10-2) to 10 (10-4) maintain their operating state without being interrupted by the power supply from the capacitors 114 of the fire hydrant devices 10 (10-2) to 10 (10-4) from the time the wire break occurs in the fire hydrant device 10 (10-1) until the loop line is re-formed by the fail-safe circuit of the fire hydrant device 10 (10-1). Therefore, the normally closed contact X4 when not energized of the relays X of the fire hydrant devices 10 (10-2) to 10 (10-4) is not closed and the wire break transfer signal is not transmitted from the fire hydrant devices 10 (10-2) to 10 (10-4) to the disaster prevention receiving panel 12. Furthermore, since a break in the internal wiring of Case 1 does not affect the loop line for switches SW2 and SW3, the operation of relay Y of fire hydrant devices 10 (10-1) to 10 (10-4) does not stop and normally closed contact X4 when not energized is not closed.

[0273] Furthermore, if a disconnection occurs in the internal wiring of the fire hydrant device 10 (10-1) in case 2, only the relay Y of the fire hydrant device 10 (10-1) stops operating, and a disconnection report signal is sent from the fire hydrant device 10 (10-1) to the disaster prevention receiving panel 12. Furthermore, if a disconnection occurs in the internal wiring of the fire hydrant device 10 (10-1) in case 3, only the relays X and Y of the fire hydrant device 10 (10-1) stop operating, and a disconnection report signal is sent from the fire hydrant device 10 (10-1) to the disaster prevention receiving panel 12.

[0274] Furthermore, if a break occurs in the internal wiring of Case 1 in the fire hydrant device 10 (10-2) of FIG. 1, for example, if the internal wiring between terminal M1 of the terminal block 30 of the fire hydrant device 10 (10-2) and switch terminal S11 of the switch SW1 of the transmitter 24 is broken, the relay X of the fire hydrant device 10 (10-2) will maintain its operating state from the time the break occurs until the power supply voltage supplied from capacitor 114 of the delay circuit of the fire hydrant device 10 (10-2) falls below the operating voltage of the relay X. However, once the power supply voltage supplied from capacitor 114 falls below the operating voltage of the relay X, the relay will stop operating and the non-energized normally open contact X3 will open, and a break notification signal will be sent from the fire hydrant device 10 (10-2) to the disaster prevention receiving panel 12. On the other hand, the relays X of the fire hydrant devices 10 (10-3) and 10 (10-4) are maintained in operation without being interrupted by the power supply from the capacitor 114 of the delay circuit of the fire hydrant devices 10 (10-3) and 10 (10-4) from the time the wire break occurs in the fire hydrant device 10 (10-2) until the loop line is re-formed by the fail-safe circuit of the fire hydrant device 10 (10-2). Therefore, the wire break transfer signal will not be sent from the fire hydrant devices 10 (10-3) and 10 (10-4) to the disaster prevention receiving panel 12 without the normally closed contact X4 when not energized of the relays X of the fire hydrant devices 10 (10-3) and 10 (10-4) being closed. Furthermore, since the relay X of the fire hydrant device 10 (10-1) can operate without being affected by the disconnection in the fire hydrant device 10 (10-2), a disconnection notification signal is not sent from the fire hydrant device 10 (10-1) to the disaster prevention receiving panel 12. Furthermore, since the disconnection of the internal wiring in Case 1 does not affect the loop line to the switches SW2 and SW3, the operation of the relay Y of the fire hydrant devices 10 (10-1) to 10 (10-4) does not stop and the normally closed contact X4 when not energized is not closed.

[0275] Furthermore, if a disconnection occurs in the internal wiring of the fire hydrant device 10 (10-2) in case 2, only the relay Y of the fire hydrant device 10 (10-2) stops operating, and a disconnection report signal is sent from the fire hydrant device 10 (10-2) to the disaster prevention receiving panel 12. Furthermore, if a disconnection occurs in the internal wiring of the fire hydrant device 10 (10-2) in case 3, only the relays X and Y of the fire hydrant device 10 (10-2) stop operating, and a disconnection report signal is sent from the fire hydrant device 10 (10-2) to the disaster prevention receiving panel 12.

[0276] The same applies if a break occurs in the fire hydrant devices 10 (10-3) and 10 (10-4), and a break notification signal will be sent to the disaster prevention receiving panel 12 only from the fire hydrant device where the break occurred.

[0277] In other words, by providing the fail-safe circuit of this embodiment, only the terminal device in which a disconnection has occurred transmits a disconnection notification signal to the disaster prevention receiving panel 12, and terminal devices in which no disconnection has occurred do not transmit a disconnection notification signal. This allows workers to easily identify the location of the disconnection on the disaster prevention receiving panel 12 side without going to the site.

[0278] [n. Variations of the present invention] Modifications of the wire breakage monitoring system and tunnel emergency equipment according to the present invention will be described in more detail. In addition to the above-described embodiment, the wire breakage monitoring system of the present invention includes the following modifications.

[0279] (Manual notification device) In the above embodiment, a fire hydrant device is used as an example of a terminal device for emergency facilities in a tunnel, but any device of emergency facilities that functions as a terminal device may be used, for example, a manual notification device connected to a disaster prevention receiving panel. The manual notification device is equipped with a transmitter, and by forming a wiring circuit via its switch in a loop similar to the case of a fire hydrant device, it is possible to monitor for breaks in the wiring circuit, including the internal wiring of the manual notification device.

[0280] (Number and type of terminal devices and electrical equipment) The number and types of terminal devices, fire hydrant devices that function as terminal devices, and electrical equipment connected to the wiring to be monitored for disconnection shown in the above embodiments are merely examples and are not limited to these.A disconnection monitoring system may be configured using any number and any type of devices, and disconnection monitoring may be performed by forming the wiring circuit to be monitored for disconnection as a loop line.

[0281] (others) Furthermore, the present invention includes appropriate modifications that do not impair the objects and advantages thereof, and is not limited to the numerical values ​​shown in the above embodiments. [Explanation of symbols]

[0282] 10(10-1)~10(10-4): Fire hydrant equipment 10a, 10b: Housing 11a, 11b: decorative frame 12: Disaster prevention receiving panel 14: Wiring cable 15: Fire hydrant door 16: Maintenance door 18: Fire extinguisher door 20: Electric door 22: Red indicator light 24: Transmitter 25a, 25b: Terminal box 26: Answer lamp 28: Telephone Jack 30:Terminal block 32: Pump start button 34: Pump start interlocking device 36, 38: Disconnection indicator light 40: Disconnection monitoring unit 42, 48, 50: Termination resistor 44: Dummy Resistance 100, 100(100-1), 100(100-2): Terminal device 102, 106: External signal lines 104, 104a, 104b: External common lines 108, RL: External relay control line 110: Upper device 112: Operation switch 114, 116: Capacitor 118, 120: Resistance SW1~SW4: Switches S1, S2, S11 to S32: Switch terminals M:Manual report line MC: Manual reporting common line HA: Pump starting line MF: Response line FC: Response common line T:Telephone line TC: Telephone common line

Claims

1. A wire break monitoring system for a facility in which electrical equipment is connected to a host device, The higher-level device and the electrical equipment are connected by a first wiring and a second wiring, a third wiring is connected between a first connection point of the first wiring and a second connection point of the second wiring in the electrical equipment via a terminator, thereby forming a loop line from the upper device to the upper device via the first wiring, the second wiring, and the third wiring; The host device monitors the loop line for breakage, A line break monitoring system characterized in that the loop line has an indicator light arranged in parallel with the terminator.

2. A wire break monitoring system for a facility in which a plurality of electrical devices are connected to a host device, a first wiring extending from the upper device to connect first connection points of all the electrical devices in series; a second wiring extending from the higher-level device to connect the second connection points of all the electrical devices in series; and connecting the upper device and the plurality of electrical devices to each other. a third wiring via a terminator is connected between the first connection point of the final-stage electrical equipment, which is located farthest in the connection to the host device via the first wiring, and the second connection point of the final-stage electrical equipment, which is located farthest in the connection to the host device via the second wiring, thereby forming a loop line from the host device to the second host device via the first wiring, the second wiring, and the third wiring; The host device monitors the loop line for breakage, A line break monitoring system characterized in that the loop line has an indicator light arranged in parallel with the terminator.

3. A wire break monitoring system for a facility in which a plurality of electrical devices are connected to a host device, a first wiring individually wired from the higher-level device to a first connection point of each electrical device; a second wiring extending from the higher-level device to connect the second connection points of all the electrical devices in series; and connecting the upper device and the plurality of electrical devices to each other. By connecting the first connection point of each electrical device to the second connection point of the final-stage electrical device, which is the farthest in the connection to the host device via the second wiring, with a third wiring wired via a terminator, a different loop line is formed for each electrical device from the host device to the host device via the first wiring, the second wiring, and the third wiring, The disconnection monitoring system is characterized in that the host device monitors each of the loop lines for disconnection.

4. A wire break monitoring system for a facility in which a plurality of electrical devices are connected to a host device, The plurality of electrical devices are divided into a plurality of groups, a first wiring that is individually wired for each group from the higher-level device and that is wired so as to connect in series the first connection points of all the electrical devices that belong to the group; a second wiring extending from the higher-level device to connect the second connection points of all the electrical devices in series; and connecting the upper device and the plurality of electrical devices to each other. a third wiring connected via a terminator between the first connection point of the final-stage electrical equipment, which is located farthest in the connection to the host device via the first wiring of each group, and the second connection point of the final-stage electrical equipment, which is located farthest in the connection to the host device via the second wiring, thereby forming a different loop line for each group from the host device to the host device via the first wiring, the second wiring, and the third wiring; The disconnection monitoring system is characterized in that the host device monitors each of the loop lines for disconnection.

5. A wire break monitoring system for equipment in which electrical equipment is connected to a host device, The higher-level device and the electrical equipment are connected by a first wiring and a second wiring, a third wiring is connected between a first connection point of the first wiring and a second connection point of the second wiring in the electrical equipment via a terminator, thereby forming a loop line from the upper device to the upper device via the first wiring, the second wiring, and the third wiring; The host device monitors the loop line for breakage, The electrical equipment is disposed in a terminal device having a terminal block, the first wiring, the second wiring, and the third wiring are wired using the terminal block; The first wiring is an external wiring from the upper device to the first terminal of the terminal block; an internal wiring from a first terminal of the terminal block to a first connection point of the electrical equipment; and The second wiring is an external wiring from the upper device to the fourth terminal of the terminal block; an internal wiring from a fourth terminal of the terminal block to a second connection point of the electrical equipment; and The third wiring is an internal wiring from the second terminal of the terminal block to the first connection point of the electrical equipment; an internal wiring from a third terminal of the terminal block to a second connection point of the electrical equipment; internal wiring from the second terminal to the third terminal of the terminal block; and The disconnection monitoring system is characterized in that the terminator is provided on the internal wiring from the second terminal to the third terminal of the terminal block.

6. A wire break monitoring system for a facility in which a plurality of electrical devices are connected to a host device, a first wiring extending from the upper device to connect first connection points of all the electrical devices in series; a second wiring extending from the higher-level device to connect the second connection points of all the electrical devices in series; and connecting the upper device and the plurality of electrical devices to each other. a third wiring via a terminator is connected between the first connection point of the final-stage electrical equipment, which is located farthest in the connection to the host device via the first wiring, and the second connection point of the final-stage electrical equipment, which is located farthest in the connection to the host device via the second wiring, thereby forming a loop line from the host device to the second host device via the first wiring, the second wiring, and the third wiring; The host device monitors the loop line for breakage, the plurality of electrical devices are arranged corresponding to a plurality of terminal devices each having a terminal block; the first wiring, the second wiring, and the third wiring are wired using the terminal block; The first wiring is an external wiring from the upper device to a first terminal of a terminal block corresponding to an electrical device in a first stage that is closest in connection with the upper device via the first wiring; Each of the internal wirings from the first terminal of the terminal block corresponding to each electrical device to the first connection point of the corresponding electrical device; Each of the internal wirings from the second terminal of the terminal block corresponding to each electrical device except for the final-stage electrical device in the connection by the first wiring to the first connection point of the corresponding electrical device; each of external wirings from a second terminal of a terminal block corresponding to each electrical device except for the electrical device at the final stage in the connection by the first wiring to a first terminal of a terminal block corresponding to the electrical device at the next stage in the connection by the first wiring; and The second wiring is an external wiring from the upper device to a fourth terminal of a terminal block corresponding to a first-stage electrical device that is located closest to the upper device in connection with the second wiring; Each internal wiring from the fourth terminal of the terminal block corresponding to each electrical device to the second connection point of the corresponding electrical device; Each of the internal wirings from the third terminal of the terminal block corresponding to each electrical device except for the final-stage electrical device in the connection by the second wiring to the second connection point of the corresponding electrical device; each of external wirings from a third terminal of a terminal block corresponding to each electrical device except for the electrical device at the final stage in the connection by the second wiring to a fourth terminal of a terminal block corresponding to the electrical device at the next stage in the connection by the second wiring; and The third wiring is an internal wiring from a second terminal of a terminal block corresponding to a final-stage electrical device in the connection by the first wiring to a first connection point of the corresponding electrical device; an internal wiring from a third terminal of a terminal block corresponding to a final-stage electrical device in the connection by the second wiring to a second connection point of the corresponding electrical device; internal wiring from the second terminal to the third terminal of the terminal block corresponding to the final stage electrical equipment; and The disconnection monitoring system is characterized in that the terminator is provided on the internal wiring from the second terminal of the terminal block to the third terminal of the third wiring.

7. 4. The wire break monitoring system according to claim 3, The electrical equipment is disposed in a terminal device having a terminal block, the first wiring, the second wiring, and the third wiring are wired using the terminal block; The first wiring is Each of external wirings from the upper device to a first terminal of a terminal block corresponding to each electrical device; Each of the internal wirings from the first terminal of the terminal block corresponding to each electrical device to the first connection point of the corresponding electrical device; and The second wiring is external wiring from the upper device to a fourth terminal of a terminal block common to all electrical equipment; an internal wiring from the fourth terminal of the terminal block to a second connection point of a first-stage electrical device that is the closest to the connection to the upper device via the second wiring; each of the internal wirings from a second connection point of each electrical device except for a final-stage electrical device in the connection by the second wiring to a second connection point of a next-stage electrical device in the connection by the second wiring; and The third wiring is Each internal wiring from the second terminal of the terminal block corresponding to each electrical device to the first connection point of the corresponding electrical device; Each of the internal wirings from the second terminal of the terminal block corresponding to each electrical device to a third terminal common to all the electrical devices; an internal wiring from the third terminal to a second connection point of an electrical device at a final stage in the connection by the second wiring; and A wire break monitoring system characterized in that the terminators are provided on each internal wiring from each second terminal of a terminal block corresponding to each electrical device to a third terminal common to all electrical devices.

8. 5. The wire break monitoring system according to claim 4, the plurality of electrical devices are arranged corresponding to a plurality of terminal devices each having a terminal block; the first wiring, the second wiring, and the third wiring are wired using the terminal block; The first wiring is each of the external wirings from the upper device to a first terminal of a terminal block corresponding to a first-stage electrical device that is closest in connection with the upper device through the first wiring of each group; Each of the internal wirings from the first terminal of the terminal block corresponding to each electrical device to the first connection point of the corresponding electrical device; Each of the internal wirings from the second terminal of the terminal block corresponding to each electrical device except for the final-stage electrical device in the connection by the first wiring to the first connection point of the corresponding electrical device; each of external wirings from a second terminal of a terminal block corresponding to each electrical device except for the electrical device at the final stage in the connection by the first wiring to a first terminal of a terminal block corresponding to the electrical device at the next stage in the connection by the first wiring; and The second wiring is an external wiring from the upper device to a fourth terminal common to all electrical equipment arranged in a terminal block of a terminal device in which an electrical equipment in a first stage that is closest in connection with the upper device through the second wiring is arranged; internal wiring from the fourth terminal of the terminal block of each terminal device to the second connection point of the first-stage electrical equipment that is the closest in the same terminal device to the upper device via the second wiring; Each of the internal wirings from the second connection point of the electrical equipment to the second connection point of the electrical equipment that is the next stage in the connection by the second wiring and is arranged in the same terminal device; Each of the internal wirings from a third terminal of a terminal block common to all the electrical equipments arranged in the same terminal device to a second connection point of an electrical equipment arranged in another terminal device, the electrical equipment being the next stage in the connection by the second wiring; Each external wiring from the third terminal of the terminal block to the fourth terminal of the terminal block arranged in a terminal device in which an electrical device that is the next stage in the connection by the second wiring is arranged; and, and The third wiring is Each of the internal wirings from the second terminal of the terminal block corresponding to the final stage electrical equipment in the connection by the first wiring of each group to the first connection point of the corresponding electrical equipment; an internal wiring from a third terminal common to all electrical equipment arranged on a terminal block of a terminal device in which an electrical equipment at a final stage in the connection by the second wiring is arranged to a second connection point of the electrical equipment at the final stage in the connection by the second wiring; Each of the internal wirings from the second terminal to the third terminal of the terminal block corresponding to the final stage electrical equipment in the connection by the first wiring of each group; and The disconnection monitoring system is characterized in that the terminators are provided on each of the internal wirings extending from the second terminals of the terminal block to the third terminals of the third wiring.

9. 9. The wire break monitoring system according to claim 5, The disconnection monitoring system further comprises an indicator light connected between each of the second terminal and the third terminal of the terminal block provided in the terminal device.

10. 10. The wire break monitoring system according to claim 5, a transfer line is provided between the host device and the terminal device; The terminal device is characterized in that it includes a line breakage notification unit that detects a line break in the loop line and transmits a line breakage notification signal to the higher-level device.

11. The wire break monitoring system according to claim 10, As the disconnection reporting unit, a relay is provided between the second terminal and the third terminal of the terminal block provided in the terminal device, A wire break monitoring system characterized in that the third normally closed when not energized contact of the relay is connected to the transfer line, and when the third normally closed when not energized contact is closed due to the relay stopping, the wire break transfer signal is transmitted to the higher-level device via the transfer line.

12. 7. The wire break monitoring system according to claim 6, Furthermore, a relay is connected between the second terminal and the third terminal of the terminal block corresponding to each electrical device so that the relay is connected to the second terminal of the terminal block via a normally open contact provided in the relay when not energized, the first terminal and the second terminal of the terminal block corresponding to each electrical device are connected via a first normally closed contact when not energized that each relay has, and the third terminal and the fourth terminal corresponding to each electrical device are connected via a second normally closed contact when not energized, A wire break monitoring system characterized in that an external relay control line for operating the relay is connected to the second terminal side of each relay.

13. 13. The wire break monitoring system according to claim 12, further comprising: the indicator lamp is connected between the second terminal and the third terminal of the terminal block corresponding to each electrical device so that the indicator lamp is connected to the second terminal of the terminal block via a normally open contact when de-energized that the relay has; A wire break monitoring system characterized in that a delay circuit is provided between the normally open contact when not energized, which each relay has, corresponding to each relay except for the first stage relay which is located closest in connection to the host device, and the third terminal of the terminal block to which the relay is connected, and the time constant is configured to increase as the relay becomes farther away in connection to the host device.

14. 9. The wire break monitoring system according to claim 8, Furthermore, the relay is connected between the second terminal of the terminal block corresponding to each electrical device and the third terminal of a terminal block common to all electrical devices arranged in the same terminal device so that the second terminal of the terminal block is connected via a normally open contact provided in the relay when not energized, the first terminal and the second terminal of the terminal block corresponding to each electrical device are connected via a first normally closed contact when not energized that is provided in each relay; the third terminal and the fourth terminal of a terminal block common to all electrical devices arranged in the same terminal device are connected via a second normally closed contact when not energized that is provided in any of the relays arranged in the same terminal device, A wire break monitoring system characterized in that an external relay control line for operating the relay is connected to the second terminal side of each relay.

15. 15. The wire break monitoring system according to claim 14, further comprising: The indicator light is connected to the second terminal of the terminal block through a normally open contact provided in the relay when not energized, and the second terminal of the terminal block corresponding to each electrical device is connected to a third terminal common to all electrical devices arranged in the same terminal device, A wire break monitoring system characterized in that a delay circuit is provided between the normally open contact when not energized, which each relay has, corresponding to each relay except for the first stage relay which is located closest in connection to the host device, and the third terminal of the terminal block to which the relay is connected, and the time constant is configured to increase as the relay becomes farther away in connection to the host device.

16. The wire break monitoring system according to claim 13 or 15, a transfer line is provided between the host device and the terminal device; the relay is a disconnection notification unit that detects a disconnection of the loop line and transmits a disconnection notification signal to the higher-level device; A wire break monitoring system characterized in that the third normally closed when not energized contact of the relay is connected to the transfer line, and when the third normally closed when not energized contact is closed due to the relay stopping, the wire break transfer signal is transmitted to the higher-level device via the transfer line.

17. 17. The wire break monitoring system according to claim 12, A wire break monitoring system characterized in that the upper device is provided with a power supply for supplying power to the external relay control line and an operating unit for operating the power supply and stopping of power supply from the power supply to the external relay control line.

18. 18. The wire break monitoring system according to claim 5, The facility is an emergency facility for a tunnel in which predetermined electrical equipment arranged in a fire hydrant device or a manual reporting device functioning as the terminal device is connected to a disaster prevention receiving panel functioning as the host device, A wire break monitoring system characterized in that the predetermined electrical equipment includes a transmitter, a pump start push button, and a pump start interlocking device.

19. 17. The wire break monitoring system according to claim 11 or 16, The facility is an emergency facility for a tunnel in which predetermined electrical equipment arranged in a fire hydrant device or a manual reporting device functioning as the terminal device is connected to a disaster prevention receiving panel functioning as the host device, The report transfer line is a telephone line provided between the disaster prevention receiving panel and the fire hydrant device or the manual reporting device, A line break monitoring system characterized by the fact that when the relay stops operating and the third normally closed contact when not energized is closed, a call signal via the telephone line is sent to the disaster prevention receiving panel as the line break notification signal.

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