Disaster prevention system

Abstract

This disaster prevention system transmits historical data of current monitoring, which includes the results of detecting abnormal current values ​​flowing through a signal line and the measurement results of current values, to a remote higher-level facility, allowing the higher-level facility to check the historical data of current monitoring. [Solution] The disaster prevention system comprises a disaster prevention receiving panel 10, terminal equipment including a manual notification device 24 that outputs a fire notification signal to the disaster prevention receiving panel 10 via a signal line when a fire occurs, and a current monitoring unit 70 that measures the current value flowing through the current line flowing through the signal line, determines an abnormality in the current value based on the measurement result, and stores the history data of the measurement result and the determination result in a memory card 100. When the current monitoring unit 70 receives a transmission request from a current monitoring higher-level station equipment 78 connected via a general-purpose external communication network 76, it extracts at least the determination result of an abnormality in the current value of the signal line from the history data stored in the memory card 100 and transmits it to the current monitoring higher-level station equipment 78.

Description

Technical Field

[0001] The present invention relates to a disaster prevention system that monitors abnormalities in a monitoring area by connecting terminal devices such as reporting devices and detectors installed in the monitoring area to a disaster prevention receiving board.

Background Art

[0002] Conventionally, in tunnels such as exclusive motorways that serve as monitoring areas, tunnel emergency facilities have been installed to construct a tunnel disaster prevention system that protects people and vehicles from fire accidents occurring inside the tunnel.

[0003] As terminal devices of such tunnel emergency facilities, a fire detector for detecting fire and reporting a fire, a manual reporting device or an emergency telephone for reporting a fire, a fire hydrant activation device for extinguishing a fire and preventing its spread, and an automatic valve device of a water spray facility that sprays fire extinguishing water from a water spray head to protect the tunnel structure and ducts from fire, a duct temperature detector, etc. are installed, and a disaster prevention receiving board for monitoring and controlling these terminal devices of the emergency facilities is installed in the tunnel electrical room.

[0004] Tunnel emergency facilities equipped with a disaster prevention receiving board and terminal devices are roughly classified into an R-type transmission method and a P-type direct transmission method. The R-type transmission method is a method that enables individual management in which terminal devices such as fire detectors with addresses set on a transmission line are connected, and operations and controls are performed for each terminal device by transmission control. The P-type direct transmission method is a method in which terminal devices are divided into predetermined section units according to the type of terminal device, etc., a plurality of terminal devices belonging to the same section are connected to a signal line drawn out in section units, and operations and controls are performed for each signal line unit.

[0005] In the P-type direct-service tunnel disaster prevention system, terminal equipment such as manual notification devices, fire hydrant activation devices, and duct temperature detectors are configured with a voltage-free normally open (a) contact switch for signal output via operation or detection, and this voltage-free a contact switch is connected to the signal line drawn from the disaster prevention receiving panel. The voltage-free a contact switch is normally off in the monitoring state, and the terminal equipment turns on the voltage-free a contact switch and outputs a voltage-free contact signal upon operation or detection. In addition, a termination resistor for monitoring for disconnections is connected to the end of the signal line.

[0006] Furthermore, the disaster prevention receiver panel applies a power supply voltage between the signal line and the common line of the signal line via a pull-up resistor. In the normal monitoring state with the voltage-free normally open contact switch off, a weak current for detecting disconnections, determined by the termination resistor, flows through the signal line, but the voltage between the signal line and the common line of the signal line, as seen from the disaster prevention receiver panel, is maintained at approximately the power supply voltage. Additionally, when the voltage-free normally open contact switch of the terminal equipment is turned on due to operation or detection, and a voltage-free contact signal is output, a current exceeding a predetermined value flows through the signal line, and the voltage between the signal line and the common line of the signal line, as seen from the disaster prevention receiver panel, drops to approximately zero volts. The disaster prevention receiver panel detects the reception of a voltage-free contact signal from the increase in current consumption of the signal line or the voltage drop between the signal line and the common line of the signal line, and performs predetermined control based on the transmitted voltage-free contact signal.

[0007] For example, if a fire alarm signal is received from a manual alarm device, the fire alarm receiving panel will perform actions such as displaying a fire alarm, controlling the illumination of the response lamp on the manual alarm device, and indicating the manual alarm area. It will also transmit the fire alarm signal to external equipment such as remote monitoring and control equipment, television monitoring equipment, alarm display board equipment, ventilation equipment, and lighting equipment to perform the necessary actions.

[0008] In conventional P-type direct-drive tunnel disaster prevention systems, when the insulation of the signal lines (wiring cables) connecting terminal equipment deteriorates over time, a current exceeding the expected level flows through the signal lines under normal monitoring conditions. This causes the disaster prevention receiver to mistakenly detect the reception of a voltage-free contact signal caused by operation or detection of the terminal equipment, and perform predetermined control actions. Simultaneously, it causes other equipment such as remote monitoring and control equipment, television monitoring equipment, alarm display board equipment, ventilation equipment, and lighting equipment to perform predetermined control actions, frequently resulting in the closure of the tunnel.

[0009] To solve this problem, a current monitoring device is installed in the same enclosure as the disaster prevention receiving panel installed in the tunnel electrical room, or in a separate enclosure. The current monitoring device measures the current flowing through the signal line to which terminal equipment is connected at predetermined intervals, such as once a day, and stores the measurement result of the current value. Furthermore, if the measured current exceeds a predetermined threshold, for example, it determines that there is an abnormality in the current value of the signal line and stores the determination result, and the disaster prevention receiving panel further triggers an alarm about the abnormality in the current value of the signal line (Patent Document 1). [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Japanese Patent Publication No. 2018-032114 [Patent Document 2] Japanese Patent Publication No. 2002-246962 [Patent Document 3] Japanese Patent Application Publication No. 11-128381 [Patent Document 4] Japanese Patent Publication No. 2004-126880 [Overview of the Initiative] [Problems that the invention aims to solve]

[0011] Incidentally, in tunnel disaster prevention systems equipped with current monitoring devices, staff members are either stationed at the tunnel-side equipment on a day-night shift basis, or they make regular rounds, for example, once a day, to visit the tunnel electrical room to check for alarms based on current value abnormalities detected by the current monitoring device. Even if no current value abnormalities are detected, they routinely perform tasks such as checking the current value measurement results by displaying historical data of the previous day's current value measurement results on the monitor device.

[0012] However, depending on weather conditions such as snowfall and wind and flood damage, it may be difficult to have staff permanently stationed at tunnel-side facilities, which are common in mountainous areas, and to conduct regular rotations and patrols. This could result in situations where staff cannot go to the tunnel electrical room, and therefore cannot address abnormal current values ​​detected by the current monitoring device, nor can they check the historical data of current measurement results. In particular, this situation could occur for extended periods during the winter in tunnels in snowy regions.

[0013] The present invention aims to provide a disaster prevention system that transmits current monitoring history data, which stores the results of determining abnormal current values ​​flowing through a signal line and the results of current value measurement, to a remote higher-level facility, allowing the higher-level facility to check the current monitoring history data. [Means for solving the problem]

[0014] (Disaster prevention system) The present invention Disaster prevention receiving panel, A terminal device that outputs a predetermined signal regarding the abnormality to the disaster prevention receiving panel via a signal line when an abnormality occurs, A current monitoring unit measures the current value flowing through a signal line and stores the historical data of the measurement results, and also determines current value abnormalities based on the current value measurement results and stores the historical data of the determination results. A disaster prevention system that is equipped with The current monitoring unit is characterized by, upon receiving a transmission request from a higher-level facility connected via a predetermined communication network, extracting the current value abnormality determination result for at least the signal line that has been determined to have an abnormal current value from the stored history data and transmitting it to the higher-level facility.

[0015] (Transmission of measurement results to higher-level equipment) When the current monitoring unit receives a transmission request from a higher-level facility, it extracts the measurement result of the signal line's current value from stored historical data and transmits it to the remote monitoring and control facility.

[0016] (Transmission of historical data in response to a request to narrow down to higher-level equipment) The current monitoring unit extracts the results of determining abnormal current values ​​in the signal line and / or the measurement results of the current values ​​from the stored historical data according to predetermined filtering conditions included in the transmission request from the higher-level equipment, and transmits them to the higher-level equipment.

[0017] (Automatic measurement, all specified measurement, or selected specified measurement) The current monitoring unit is, At predetermined timings set in advance, the current value flowing through each signal line is measured, and an abnormality in the current value is determined for each line. The historical data of the measurement results and the abnormality determination results for each signal line are then stored. When a predetermined all-specified measurement operation is detected in which all signal lines are specified at any given time, the current value flowing through each of the signal lines is measured, an abnormality in the current value of each line is determined, and historical data of the measurement results and the current value abnormality determination results for each of the signal lines is stored, or, When a predetermined selection measurement operation is detected in which one or more signal lines are selected at any given time, the current value flowing through each of the selected signal lines is measured, and an abnormality in the current value for each line is determined. The measurement results and the determination results of the abnormalities in the current value for each of the selected signal lines are stored as historical data.

[0018] (Communication network connecting the current monitoring unit and the higher-level equipment) The current monitoring unit stores historical data in an electronic recording medium equipped with communication capabilities. When a transmission request is received from a higher-level device connected via a communication network, the history data stored in the electronic recording medium is read out and transmitted to the higher-level device.

[0019] (Configuration for measuring the current value of the signal line) The current monitoring unit includes a pair of current input terminals for inputting the current flowing through the signal line. When measuring the current value, a measurement line switching unit is provided to switch the connection of the pair of current input terminals from a state where they are not inserted into the signal line to a state where they are inserted into the signal line.

[0020] (Current monitoring unit for measuring the current value of each signal line) The measurement line switching unit is provided for each signal line. When measuring the current value, the measurement line switching unit provided for the signal line for measuring the current value switches the connection of the pair of current input terminals to a state where they are inserted into the signal line of the signal line for measuring the current value, and the current monitoring unit measures the current value flowing through each of the signal lines to be measured.

[0021] (Switching of the signal line to be measured by the relay) The measurement line switching unit For each signal line, a relay having a first switching relay contact and a second switching relay contact that operate by energization is provided. When the relay is non-operating, at the insertion part of the pair of current input terminals, the first switching relay contact connects the upstream side and the downstream side of the signal line, and the second switching relay contact disconnects the connection between the upstream side of the signal line and one of the pair of current input terminals of the current monitoring unit, so that the current monitoring unit is not inserted into the signal line. When the relay is operating, at the insertion part of the pair of current input terminals, the first switching relay contact connects the downstream side of the signal line to the other of the pair of current input terminals of the current monitoring unit, and the second switching relay contact connects the upstream side of the signal line to one of the pair of current input terminals of the current monitoring unit, so that the current monitoring unit is inserted into the signal line.

Effect of the Invention

[0022] (Basic effects) The present invention relates to a disaster prevention system comprising a disaster prevention receiving panel, terminal equipment that outputs a predetermined signal related to the abnormality to the disaster prevention receiving panel via a signal line when an abnormality occurs, and a current monitoring unit that measures the current value flowing through the signal line and stores historical data of the measurement results, as well as historical data of the determination results of current value abnormalities. The current monitoring unit is configured to, when it receives a transmission request from a higher-level facility connected via a predetermined communication network, extract the determination result of current value abnormalities for at least the signal line that has been determined to have a current value abnormality from the stored historical data and transmit it to the higher-level facility. Therefore, in situations where it is difficult for personnel to be stationed at the monitoring area, for example, the facility on the tunnel side, by making a transmission request from the higher-level facility, the determination result of current value abnormalities stored in the current monitoring unit can be obtained from the historical data without having to go to the facility on the tunnel side, and the signal line that has deteriorated over time can be easily and readily identified and dealt with by, for example, displaying it on a screen on the higher-level facility side.

[0023] (Effect of transmitting measurement results to higher-level equipment) Furthermore, the current monitoring unit, upon receiving a transmission request from a higher-level device, extracts the measurement result of the current value from the stored historical data and transmits it to the higher-level device. This allows for the detection of signal lines with abnormal current values ​​without having to go to the monitoring area's equipment. For example, by displaying the history of past current values ​​on the higher-level device, it is possible to understand the progress of aging deterioration from past changes in current values, enabling appropriate countermeasures against aging deterioration.

[0024] (Effect of sending historical data in response to requests to narrow down to higher-level equipment) Furthermore, the current monitoring unit extracts the results of current value anomaly detection and / or current value measurement results for signal lines according to predetermined filtering conditions included in the transmission request from the higher-level equipment, from the stored historical data and transmits them to the higher-level equipment. For example, in a tunnel disaster prevention system, by specifying filtering conditions such as the systems corresponding to the up-line and down-line tunnels, manual notification devices, fire hydrant activation devices, duct temperature detectors, and section numbers, the higher-level equipment can extract and transmit the necessary specific current value anomaly detection results and current value measurement results from the vast amount of historical data, enabling efficient determination of line degradation status and other conditions for specific signal lines.

[0025] (Effects of automatic measurement, all-specified measurement, or selectively specified measurement) Furthermore, the current monitoring unit measures the current flowing through each of the signal lines at predetermined preset timings, determines whether there is an abnormality in the current value for each line, and stores historical data of the measurement results and the determination results of the abnormal current value for each of the signal lines, or, when a predetermined all-specified measurement operation is detected at any given timing in which all signal lines are specified, it measures the current flowing through each of the signal lines, determines whether there is an abnormality in the current value for each line, and stores historical data of the measurement results and the determination results of the abnormal current value for each of the signal lines, or, when one or more signal lines are selected and specified at any given timing, it performs a predetermined selected measurement operation. When an operation is detected, the current value flowing through each of the selected signal lines is measured, and an abnormality in the current value is determined for each line. The measurement results and the abnormality determination results for the selected signal lines are stored as historical data. Normally, the current values ​​of the signal lines are measured at predetermined intervals, for example, once a day, and the measurement results and abnormality determination results are stored as historical data. This stored historical data can be used by remote higher-level equipment, enabling efficient monitoring of the aging degradation of signal lines during operation from the higher-level equipment side.

[0026] Furthermore, even when performing a full-specified measurement that specifies all signal lines, or a selective-specified measurement that selects one or more signal lines, the historical data can be made available not only to the equipment on the monitoring area side, but also to the remote higher-level equipment. This allows for efficient monitoring of signal lines that have received a predetermined signal related to an anomaly, or confirmation of the progress of insulation deterioration in signal lines where a fault has been detected, from the higher-level equipment side.

[0027] (Effects of the communication network connecting the current monitoring unit and the higher-level equipment) Furthermore, the current monitoring unit stores historical data on an electronic recording medium equipped with communication capabilities. When it receives a transmission request from a higher-level device connected via a communication network, it reads the historical data stored on the electronic recording medium and transmits it to the higher-level device. This allows for easy and convenient communication between the current monitoring unit and the higher-level device via a general-purpose communication network such as a LAN network, the Internet, or a mobile phone network, enabling the monitoring equipment to easily and conveniently transmit current monitoring historical data to the higher-level device in response to a transmission request from the higher-level device.

[0028] Furthermore, the effects of using a general-purpose communication network can be explained in comparison with conventional disaster prevention systems that use a dedicated communication network as follows. Conventionally, tunnel disaster prevention systems are equipped with remote monitoring and control equipment, and it is conceivable that the current monitoring device transmits the history of current monitoring data to a higher-level system equipped with remote monitoring and control equipment installed in a road management office of a road information system located away from the tunnel, using a communication network dedicated to this remote monitoring and control equipment.

[0029] Here, the remote monitoring and control equipment is responsible for the overall monitoring and control of power-related equipment (power receiving and distribution equipment, private power generation equipment, ventilation equipment, lighting equipment, etc.) and tunnel emergency equipment installed in each tunnel. IG slave station equipment (intelligent slave station equipment) is installed on the side of each tunnel subject to monitoring and control, and each IG slave station equipment is connected to a higher-level station equipment installed as a higher-level facility via a dedicated communication network (dedicated data transmission network).

[0030] Furthermore, monitoring and control of tunnel emergency equipment by remote monitoring and control equipment involves connecting disaster prevention receiving panels to IG slave station equipment, transmitting processing results from monitoring by disaster prevention receiving panels installed in each tunnel to the higher-level station equipment via IG slave station equipment, and inputting control signals transmitted from the higher-level station equipment to the disaster prevention receiving panels via IG slave station equipment to perform the corresponding control on the disaster prevention receiving panels installed in each tunnel.

[0031] However, in order to transmit current monitoring history data from the current monitoring device to the higher-level station equipment using the conventional communication network dedicated to remote monitoring and control equipment, it would be necessary to either install a new file transfer function in the current monitoring device and IG slave station equipment installed on the tunnel side to transmit the current monitoring history data stored in the current monitoring device, or integrate the current monitoring device with the disaster prevention receiving panel. This would require significant modifications to the equipment on the tunnel side, and furthermore, the data transmission method between the higher-level station equipment and multiple IG slave station equipment, which is built as a communication network dedicated to remote monitoring and control equipment, would need to be revised to allow the transmission of current monitoring history data. This would require considerable effort, time, and expense, making practical implementation difficult.

[0032] In contrast, when using general-purpose communication networks such as LAN networks, the Internet, or mobile phone networks, an electronic recording medium equipped with communication functions compatible with these general-purpose communication networks, such as a memory card with wireless LAN capabilities, is used. By storing the current monitoring history data on this electronic recording medium, it becomes possible to send the current monitoring history data from the current monitoring device to the higher-level equipment with a simple configuration, without affecting the remote monitoring and control equipment using a dedicated communication network.

[0033] (Effects of a configuration that measures the current value of the signal line) Furthermore, the current monitoring unit is equipped with a pair of current input terminals for inputting the current flowing through the signal line, and a measurement line switching unit is provided to switch the connection of the pair of current input terminals from a state where they are not inserted into the signal line to a state where they are inserted when measuring the current value. As a result, when the current monitoring unit measures the current value, the current monitoring unit is inserted into the signal line, and when the current monitoring unit does not measure the current value, the current monitoring unit is disconnected from the signal line. This allows the current monitoring unit to monitor the signal line without interfering with normal monitoring by the disaster prevention receiving panel via the signal line.

[0034] (Effect of the current monitoring unit that measures the current value of each signal line) A measurement line switching unit is provided for each signal line. When measuring a current value, the measurement line switching unit provided for the signal line to be measured switches the connection so that a pair of current input terminals are interposed in the line of the signal line to be measured. The current monitoring unit then measures the current value flowing through each of the signal lines to be measured. As a result, a single current monitoring unit can measure the current values ​​of multiple signal lines, simplifying the circuit configuration and reducing costs compared to providing a current detection unit for each signal line.

[0035] (Effect of switching the signal circuit being measured by a relay) Furthermore, the measurement line switching unit is provided with a relay for each signal line, which has a first switching relay contact and a second switching relay contact that are activated by the flow of power. When the relay is not activated, the first switching relay contact connects the upstream and downstream sides of the signal line at the insertion point of the pair of current input terminals, and the second switching relay contact disconnects the connection between the upstream side of the signal line and one of the pair of current input terminals of the current monitoring unit, thereby preventing the current monitoring unit from being inserted into the signal line. When the relay is activated, the first switching relay contact connects the downstream side of the signal line at the insertion point of the pair of current input terminals. The monitoring unit is connected to the other of its pair of current input terminals, and the second switching relay contact is connected to one of its pair of current input terminals on the upstream side of the signal line, thereby inserting the current monitoring unit into the signal line. When measuring the current value of a signal line, the relay installed on the signal line to be measured is energized and activated, switching the first and second switching relay contacts. This connects the signal line to be measured with a pair of current input terminals inserted into it, allowing the current monitoring unit to measure the current value flowing through each signal line. [Brief explanation of the drawing]

[0036] [Figure 1] This is an explanatory diagram showing the general configuration of the tunnel disaster prevention system. [Figure 2] This is an explanatory diagram showing an embodiment of the current monitoring function of the disaster prevention receiving panel. [Figure 3] This is an explanatory diagram showing all specified measurement screens displayed on the sub-monitor device. [Figure 4] This is an explanatory diagram showing the selection and measurement screen displayed on the sub-monitor device. [Figure 5] This flowchart illustrates the current monitoring and control performed by the current monitoring unit of the disaster prevention receiver panel. [Figure 6] This is an explanatory diagram illustrating the current monitoring function of a disaster prevention receiving panel using a dedicated external communication network. [Modes for carrying out the invention]

[0037] Embodiments of the disaster prevention system according to the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiments.

[0038] [Basic Concepts of the Embodiment] First, the basic concepts of this embodiment will be explained. This embodiment relates to a disaster prevention system that monitors abnormalities within a monitoring area by connecting terminal equipment installed within the monitoring area to a disaster prevention receiving panel. Here, "monitoring area" includes the area, range, or space within a structure that is the target of monitoring abnormalities, and specifically includes the space inside a tunnel. Furthermore, "tunnel" refers to a tunnel that has a road through which vehicles pass, such as an expressway or a motorway.

[0039] Furthermore, the disaster prevention system of this embodiment includes a disaster prevention receiving panel, terminal equipment, and a current monitoring unit.

[0040] Here, "disaster prevention receiving panel" refers to a device that primarily manages or controls terminal equipment connected to it, and is a concept that includes devices also known as disaster prevention receivers, disaster prevention monitoring panels, central monitoring panels, etc.

[0041] Furthermore, "terminal equipment" refers to equipment that is managed or controlled by the disaster prevention receiving panel and outputs a predetermined signal related to the abnormality to the disaster prevention receiving panel via a signal line when an abnormality occurs. The "terminal equipment" targeted by this embodiment is, for example, equipment equipped with a voltage-free normally open contact switch that closes its contacts in response to operations or detection actions related to a fire. Specifically, this concept includes manual notification devices, fire extinguishing activation devices, duct temperature detectors, etc., which are installed as emergency equipment in tunnels.

[0042] Here, "signal line" refers to wiring that connects the disaster prevention receiving panel and terminal equipment, enabling the disaster prevention receiving panel to manage or control electrical equipment, and includes, for example, a wiring cable formed by a pair of signal lines and a common line.

[0043] Furthermore, the "current monitoring unit" measures the current value flowing through the signal line between the disaster prevention receiving panel and terminal equipment, stores the historical data of the measurement results, determines current value abnormalities based on the current value measurement results, stores the historical data of the determination results, and, when a transmission request is received from a higher-level facility connected via a predetermined communication network, extracts at least the determination result of the current value abnormality in the signal line from the stored historical data and transmits it to the higher-level facility.

[0044] Here, "historical data of current value measurement results" refers to data that includes the current value of the measured signal line, and may also include historical data other than current values. "Historical data of current value anomaly determination results" refers to data that indicates whether or not the measured signal line had a current value anomaly, and may also include historical data other than data indicating a current value anomaly.

[0045] Furthermore, the "communication network" refers to a communication network for connecting the current monitoring unit installed in the monitoring area with a remote, higher-level facility located away from the monitoring area. Upon receiving a transmission request from the higher-level facility, the current monitoring unit extracts the result of determining an abnormal current value from the historical data it stores and transmits it.

[0046] Furthermore, while the configuration and type of communication network are arbitrary, they include general-purpose communication networks such as LAN communication networks, the Internet, or mobile phone networks, as well as dedicated communication networks provided by disaster prevention systems. A "general-purpose communication network" is defined as a network that enables communication connections between devices and equipment owned by an unspecified number of users using IDs and passwords obtained through contracts with communication carriers, and includes "public communication networks," "mass communication networks," and "open communication networks."

[0047] In contrast, a "dedicated communication network" is a communication network in which the communication carrier and users are limited to a specific business entity. This includes, for example, intranetworks known as communication networks exclusively for the internal use of a business entity. Specifically, in the case of conventional tunnel disaster prevention systems, this would refer to the communication network used for remote monitoring and control equipment (the data transmission network connecting the substation on the disaster prevention receiving panel side and the master station of the higher-level equipment).

[0048] Furthermore, the current monitoring unit may, upon receiving a transmission request from a higher-level device, extract the measurement result of the signal line's current value from the stored historical data and transmit it to the higher-level device, or it may extract the determination result of an abnormality in the signal line's current value and / or the measurement result of the current value from the stored historical data according to predetermined filtering conditions included in the transmission request from the higher-level device and transmit it to the higher-level device.

[0049] Here, the "predetermined filtering conditions" and their types are arbitrary, but they include, for example, conditions targeting the results of current value abnormality detection and / or current value measurement results for a predetermined signal line, and conditions targeting the results of current value abnormality detection and / or current value measurement results for a predetermined period. Specifically in the case of a tunnel disaster prevention system, the filtering conditions would include systems corresponding to the up-line and down-line tunnels, terminal equipment such as manual notification devices, fire hydrant activation devices, and duct temperature detectors, as well as section numbers.

[0050] Furthermore, the current monitoring unit may perform automatic measurement, all-specified measurement, and selective-specified measurement. "Automatic measurement" means measuring the current value flowing through each of the signal lines at a predetermined timing set in advance, determining whether there is an abnormality in the current value of each line, and storing historical data of the measurement results and the determination results of the abnormality in the current value of each of the signal lines. "All-specified measurement" means that when a predetermined all-specified measurement operation in which all signal lines are specified at any timing is detected, the current value flowing through each of the signal lines is measured, determining whether there is an abnormality in the current value of each line, and storing historical data of the measurement results and the determination results of the abnormality in the current value of each of the signal lines. "Selective-specified measurement" means that when a predetermined selective-specified measurement operation in which one or more signal lines are selected is detected at any timing, the current value flowing through each of the selected signal lines is measured, determining whether there is an abnormality in the current value of each line, and storing historical data of the measurement results and the determination results of the abnormality in the current value of each of the selected signal lines.

[0051] Furthermore, the "pre-set predetermined timing" in automatic measurement is arbitrary, but includes measurements that are performed periodically, such as once a day. Also, the "all-specified measurement operation" in all-specified measurement and the "selective-specified measurement operation" in selective-specified measurement can be performed at any location, including operations at the current monitoring unit, the disaster prevention receiving panel, or the higher-level equipment.

[0052] Furthermore, the current monitoring unit may store historical data on an electronic recording medium equipped with communication capabilities, and when it receives a transmission request from a higher-level device connected via a communication network, it may read the historical data stored on the electronic recording medium and transmit it to the higher-level device. Here, "electronic recording medium equipped with communication capabilities" refers to any electronic recording medium that has communication capabilities corresponding to the communication standards used in the communication network for communication connection with the higher-level device and is capable of storing historical data, and includes, for example, a memory card equipped with wireless LAN.

[0053] Furthermore, the current monitoring unit may be equipped with a pair of current input terminals for inputting the current flowing through the signal line, and a measurement line switching unit may be provided to switch the connection of the pair of current input terminals from a state where they are not interposed in the signal line to a state where they are interposed when measuring the current value. Here, "current input terminals" refers to the input terminals to the current monitoring unit when connected to the signal line line by the measurement line switching unit. Also, "measurement line switching unit" includes a circuit equipped with various switches for switching wiring connections or switching between connected and disconnected states, and includes, for example, a circuit equipped with a relay.

[0054] Alternatively, a measurement line switching unit may be provided for each signal line, and when measuring current values, the measurement line switching unit provided on the signal line to be measured may switch the connection so that a pair of current input terminals are interposed in the line of the signal line to be measured, and the current monitoring unit may measure the current values ​​flowing through each of the signal lines to be measured.

[0055] Furthermore, the measurement line switching unit may be provided with a relay for each signal line, which has a first switching relay contact and a second switching relay contact that are activated by energization. When the relay is not activated, the first switching relay contact connects the upstream and downstream sides of the signal line at the insertion point of a pair of current input terminals, and the second switching relay contact disconnects the upstream side of the signal line from one of the pair of current input terminals of the current monitoring unit, thereby not inserting the current monitoring unit into the signal line. When the relay is activated, the first switching relay contact connects the downstream side of the signal line to the other of the pair of current input terminals of the current monitoring unit at the insertion point of a pair of current input terminals, and the second switching relay contact connects the upstream side of the signal line to one of the pair of current input terminals of the current monitoring unit, thereby inserting the current monitoring unit into the signal line. Here, the "switching relay contact" of the relay includes a switching point of wiring that can switch wiring connections or switches between connected and disconnected.

[0056] In the specific embodiment described below, the "disaster prevention system" is a "tunnel disaster prevention system that monitors fires in the tunnel by connecting terminal equipment installed in the tunnel to a disaster prevention receiving panel," the "current monitoring unit" is "integrally provided with the disaster prevention receiving panel," the "terminal equipment" is a "manual notification device" and a "fire pump activation device" equipped with a voltage-free normally open-contact switch, the "communication network" that connects the current monitoring unit to the higher-level equipment is a "general-purpose external communication network combining a wireless LAN and a mobile phone network" or a "dedicated external communication network that connects the higher-level station equipment and the IG slave station equipment of the remote monitoring and control equipment," and the "measurement line switching unit" is a "relay circuit equipped with a relay that has two switching relay contacts for each signal line."

[0057] [Specific details of the embodiment] I will now explain the tunnel disaster prevention system in more detail. The details will be explained in the following sections. a. Overview of the tunnel disaster prevention system b. Disaster prevention receiver b1. Configuration of the disaster prevention receiving panel b2. Monitoring and control of disaster prevention receiving panels c. Current monitoring of the disaster prevention receiving panel c1. Overview of current monitoring of signal lines c2. Signaling circuits c3.Current monitoring section c4. Measurement circuit switching unit c5. Automatic measurement of current value c6. Measurement of all specified current values c7. Current value selection and measurement c8. Memory card with communication function d. General-purpose external communication network e. Control operation of the current monitoring unit f. Tunnel disaster prevention system using a dedicated external communication network g. Modified form of the present invention

[0058] [a. Overview of the tunnel disaster prevention system] A more detailed explanation of the tunnel disaster prevention system will be provided. This explanation will refer to Figure 1, which shows an overview of the tunnel disaster prevention system's configuration.

[0059] As shown in Figure 1, the tunnel emergency equipment consists of a disaster prevention receiving panel 10 and terminal equipment groups 18(18-1) to 18(18-n) and 20(20-1) to 20(20-n). From the disaster prevention receiving panel 10 installed in the tunnel electrical room, P-type signal lines 14 and 16 are drawn out to each of the terminal equipment groups 18(18-1) to 18(18-n) and 20(20-1) to 20(20-n) of the tunnel emergency equipment, which are installed in sections at predetermined distances in the direction of vehicle travel, for the uphill tunnel 12(12-1) and downhill tunnel 12(12-2), which are constructed as tunnels for automobile roads. Terminal equipment belonging to each of the terminal equipment groups 18(18-1) to 18(18-n) and 20(20-1) to 20(20-n) is connected to each signal line 14 and 16. In this embodiment, the P-type signal lines 14 and 16 use wiring cables composed of signal lines and common lines.

[0060] The terminal equipment of the tunnel emergency equipment is a group of manual notification devices 24 and fire pump starters 26 installed on four fire hydrant devices 22, as shown representatively in terminal equipment group 18 (18-1), with the manual notification devices 24 connected to signal line 14 and the fire pump starters 26 connected to signal line 16.

[0061] Here, since the installation interval of the fire hydrant devices 22 is, for example, 50 meters, each section of terminal equipment groups 18(18-1)~18(18-n) and 20(20-1)~20(20-n), which include four fire hydrant devices 22, is approximately 200 meters.

[0062] The manual notification device 24 is installed on the electrically operated door of the fire hydrant device 22, along with a red indicator light and a response lamp. It is equipped with a voltage-free normally open (a) contact switch that can be turned on by push-button operation. When a fire occurs and a road user operates the push-button, the voltage-free a-contact switch is turned on, and current flows through the signal line 14 to which the operated manual notification device 24 is connected, transmitting a fire notification signal to the disaster prevention receiving panel 10. Upon receiving the fire notification signal from the manual notification device 24, the disaster prevention receiving panel 10 outputs a fire alarm and transmits a response signal to the fire hydrant device 22, causing the red indicator lights of the four fire hydrant devices 22 in the same section belonging to the same group of terminal equipment to flash and the response lamps to light up.

[0063] The fire pump activation device 26 is equipped with a voltage-free normally open (a) contact switch that is turned on by pressing the pump activation button on the fire hydrant device 22. When a firefighter opens the maintenance door of the fire hydrant device 22 and presses the pump activation button, the voltage-free normally open (a) contact switch is turned on, and current flows through the signal line 16 to which the activated fire pump activation device 26 is connected, transmitting a pump activation signal to the disaster prevention receiving panel 10. Upon receiving the pump activation signal from the fire pump activation device 26, the disaster prevention receiving panel 10 activates the fire pump equipment 54 to pressurize and supply firefighting water. The part of the fire pump activation device 26 that is turned on by pressing the pump activation button is sometimes called the "fire pump activation switch".

[0064] Furthermore, the fire pump activation device 26 is equipped with another voltage-free normally open (a) contact switch that turns on and off in conjunction with the opening and closing operation of the fire hydrant valve opening / closing lever provided on the fire hydrant device 22. This switch is connected in parallel to the voltage-free normally open (a) contact switch that turns on when the pump activation button is pressed. In the event of a fire, when a user opens the fire hydrant door of the fire hydrant device 22, pulls out the hose with the nozzle, and operates the fire hydrant valve opening / closing lever to the open position to start water discharge, the other voltage-free normally open (a) contact switch turns on, and current flows through the signal line 16 to which the activated fire pump activation device 26 is connected, sending a pump activation signal to the disaster prevention receiving panel 10. Similar to when the pump activation button is pressed, the disaster prevention receiving panel 10 activates the fire pump equipment 54 and pressurizes and supplies water for firefighting. Note that the section of the fire pump activation device 26 that consists of a voltage-free normally open (a) contact switch that turns on and off when the fire hydrant valve opening / closing lever is opened and closed is sometimes called a "fire pump activation interlocking device" or "fire pump activation interlocking switch".

[0065] In addition to the manual notification device 24 for the fire hydrant system 22 and the fire pump activation device 26, terminal equipment for the tunnel emergency system includes fire detectors, automatic valve systems, duct temperature detectors, etc., but these are not shown in the illustration.

[0066] Fire detectors are installed along the wall in the direction of vehicle travel at intervals of, for example, 25 or 50 meters. A monitoring area is set on both sides of the 25 or 50-meter distance in the direction of vehicle travel, and a fire alarm is triggered when flames from a fire are detected within the monitoring area.

[0067] The automatic valve system is part of the water spray system and operates by remotely controlling the opening of the main valve via a signal line of the operating electric valve. This drives the main valve to open, and firefighting water is discharged from multiple water spray heads installed on the upper part of the tunnel wall in the direction of vehicle travel, protecting the tunnel structure from fire.

[0068] The duct temperature detector is installed in the ducts containing pipes and cables inside the monitoring walkway located along the tunnel wall. It detects temperature increases inside the duct due to cable fires, etc., and transmits a temperature detection signal to the disaster prevention receiving panel 10 by turning on a voltage-free normally open contact switch.

[0069] In addition to tunnel emergency equipment, other facilities installed on the tunnel side include IG substation equipment 42, ventilation equipment 44, alarm display board equipment 46, radio rebroadcasting equipment 48, television monitoring equipment 50, lighting equipment 52, fire pump equipment 54, and cooling pump equipment 56 for ducts.

[0070] Here, with the exception of the IG substation equipment 42 being connected via a data transmission line, all other equipment is individually connected to the disaster prevention receiving panel 10 via P-type signal lines. Furthermore, the IG substation equipment 42 constitutes part of the remote monitoring and control equipment 60, which communicates with the disaster prevention receiving panel 10 to a higher-level station equipment 62 located far outside the tunnel via a dedicated external communication network 58.

[0071] Furthermore, the ventilation equipment 44 is a system that energizes the air inside the tunnel by operating jet fans installed on the ceiling side of the tunnel, creating a ventilation flow in the direction of vehicle travel. In addition, the warning display board equipment 46 is a system that informs tunnel users of any abnormalities inside the tunnel by displaying them on an electronic display board. In addition, the radio rebroadcasting equipment 48 is a system that allows drivers and others inside the tunnel to receive information from the road administrator. The television monitoring equipment 50 is a system that allows for confirmation of the scale and location of fires, operation of water spray equipment, and understanding the situation inside the tunnel when guiding evacuations. In addition, the lighting equipment 52 is a system that drives and controls the lighting equipment inside the tunnel.

[0072] Furthermore, as mentioned above, the fire pump system 54 is a system that activates the fire pump via the disaster prevention receiving panel 10, which receives a pump activation signal from the fire pump activation device 26, and supplies pressurized fire extinguishing water to the water supply piping for the fire hydrant system 22, etc.

[0073] Furthermore, the cooling pump equipment 56 is a system that activates the cooling pump via a disaster prevention receiving panel 10, which receives temperature detection signals from duct temperature detectors located in ducts with pipes and cables laid inside the monitoring passage along the tunnel wall, and supplies pressurized cooling water to the water supply pipes inside the ducts.

[0074] [b. Disaster Prevention Receiving Panel] (b1. Configuration of the disaster prevention receiving panel) The configuration of the disaster prevention receiver panel will be explained in more detail. As shown in Figure 1, the disaster prevention receiver panel 10 is equipped with a control unit 28. The control unit 28 is a function that is realized, for example, by the execution of a program, and the hardware used is a computer circuit equipped with a CPU, memory, various input / output ports including an AD conversion port, etc.

[0075] A P-type transmission unit 30 is provided for the control unit 28, which connects the terminal equipment groups 18(18-1) to 18(18-n) and 20(20-1) to 20(20-n) installed in the tunnel via P-type signal lines 14 and 16.

[0076] In addition, the control unit 28 is equipped with a main monitor device 32, an alarm unit 34 with a speaker, buzzer, and alarm indicator light, a display unit 35 with various indicator lights, an operation unit 36 ​​with various switches, a data transmission unit 38, and a P-type transmission unit 40. The data transmission unit 38 is connected to the IG slave station equipment 42 via a data transmission line, and the P-type transmission unit 40 is individually connected to the ventilation equipment 44, alarm display board equipment 46, radio rebroadcasting equipment 48, television monitoring equipment 50, lighting equipment 52, fire pump equipment 54, and cooling pump equipment 56 via P-type signal lines.

[0077] Furthermore, the disaster prevention receiver panel 10 is equipped with a current monitoring unit 70, a measurement line switching unit 72, a sub-monitor device 74, and a terminal communication unit 75 for monitoring the current of the P-type signal lines 14 and 16.

[0078] Here, we will describe the remote monitoring and control equipment 60 that corresponds to the disaster prevention receiving panel 10. The remote monitoring and control equipment 60 is responsible for the overall monitoring and control of the operation of power-related equipment (power receiving and distribution equipment, private power generation equipment, ventilation equipment, lighting equipment, etc.) and tunnel emergency equipment installed in multiple tunnels. In this embodiment, for monitoring and control of the operation of tunnel emergency equipment, the remote monitoring and control equipment 60 includes IG slave station equipment 42 connected to the disaster prevention receiving panel 10 by a data transmission line, a dedicated external communication network 58, and a higher-level station equipment 62.

[0079] The higher-level station equipment 62 is, for example, equipment installed in a road management office of a road information system that operates and manages a highway network including tunnels located far from the tunnels. It is a higher-level facility that connects each of the IG slave station equipment 42 installed for each of the disaster prevention receiving panels 10 installed in multiple tunnels in a tree-like communication configuration.

[0080] The disaster prevention receiving panel 10 then transmits the processing results related to monitoring and controlling fires in the tunnel from the IG substation equipment 42 to the upper station equipment 62 via the dedicated external communication network 58 for display, and receives control signals transmitted from the upper station equipment 62 via the dedicated external communication network 58 from the IG substation equipment 42 and performs corresponding control actions.

[0081] (b2. Monitoring and control of disaster prevention receiving panel) The monitoring and control by the control unit 28 installed in the disaster prevention receiving panel 10 will be explained in more detail.

[0082] The control unit 28 performs predetermined monitoring and control based on fire-related signals from terminal equipment such as a manual notification device 24, a fire pump activation device 26, a fire detector, a duct temperature detector, and an automatic valve device, which are installed in the fire hydrant system 22 located inside the tunnel.

[0083] As a predetermined monitoring and control measure, for example, when the disaster prevention receiving panel 10 receives a fire alarm signal from the operation of a manual notification device 24 installed on the fire hydrant device 22, the alarm unit 34 sounds the main sound, the display unit 35 displays a representative fire, the main monitor device 32 displays the fire and the manual notification area, and other fire alarm functions are activated. At the same time, a response signal is sent to the fire hydrant device 22, causing the red indicator light to flash and the response lamp to light up.

[0084] Furthermore, for example, if the fire hydrant valve opening / closing lever on the fire hydrant device 22 is opened, the fire prevention receiving panel 10 receives a pump start signal from the fire pump start device 26, and performs control to send a pump start signal to the fire pump equipment 54 to start it.

[0085] Furthermore, for example, if the temperature inside the duct rises and the disaster prevention receiving panel 10 receives a temperature detection signal from the duct temperature detector, it sends a pump start signal to the cooling pump equipment 56 and controls the system to cool the inside of the duct by spraying water from water spray heads installed inside the duct.

[0086] Furthermore, the control unit 28 performs the following controls for other equipment: sending a fire alarm signal to the higher-level station equipment 62 of the remote monitoring and control equipment 60 via the IG slave station equipment 42 to trigger an alarm in the higher-level station equipment 62; displaying the manually reported area using the television monitoring equipment 50; displaying the fire alarm for the manually reported area using the alarm display board equipment 46; ventilating the manually reported area using the ventilation equipment 44; and illuminating the manually reported area using the lighting equipment 52.

[0087] Furthermore, the control unit 28 monitors for disconnections in the signal lines 14 and 16. When a disconnection is detected, the alarm unit 34 sounds an alarm, the display unit 35 displays a representative of the disconnection, and the main monitor device 32 displays the occurrence of the disconnection and the location of the disconnection on its screen. The control unit 28 monitors for disconnections in the signal lines 14 and 16 by connecting termination resistors to the ends of the signal lines 14 and 16 to supply a disconnection monitoring current, and detects a disconnection when the disconnection monitoring current is interrupted.

[0088] [c. Current monitoring of the disaster prevention receiving panel] I will now explain in more detail the current monitoring of the disaster prevention receiving panel.

[0089] (c1. Overview of current monitoring of signal lines) First, let's explain the overview of current monitoring of signal lines. As shown in Figure 1, the disaster prevention receiving panel 10 is equipped with a current monitoring unit 70, a measurement line switching unit 72, a sub-monitor device 74, and a terminal communication unit 75 to monitor the current flowing through signal lines 14 and 16. The terminal communication unit 75 is connected to a current monitoring upper-level station equipment 78 installed on the upper-level station equipment 62 side of the remote monitoring and control equipment 60 via a general-purpose external communication network 76.

[0090] The current monitoring unit 70 measures the current flowing through the signal line 14 to which the manual notification device 24 is connected and the signal line 16 to which the fire pump device 26 is connected, stores the measurement results as historical data, and also determines if there is a current value abnormality based on the measurement results and stores the determination results as historical data. When measuring the current value, the current monitoring unit 70 switches the signal lines 14 and 16 on a line-by-line basis so that the current value of each signal line 14 and 16 can be measured by switching control of the measurement line switching unit 72, and measures the current value.

[0091] Furthermore, when the current monitoring unit 70 receives a transmission request from the current monitoring superior station equipment 78, which functions as a higher-level facility in current monitoring, via the general-purpose external communication network 76, it extracts the measurement results of the current values ​​of the signal lines 14 and 16 and / or the determination results of current value abnormalities from the stored history data and transmits them to the current monitoring superior station equipment 78 for display.

[0092] The functional configuration of the current monitoring system will be explained in more detail. This explanation will refer to Figure 2, which shows an embodiment of the current monitoring function of the disaster prevention receiving panel.

[0093] (c2. Signaling circuits) First, we will explain in more detail the signal line to which the current value is to be measured. Figure 2 shows the signal line 14 to which the manual notification device 24 of the terminal equipment group 18(18-1) in Figure 1 is connected as a representative example.

[0094] As shown in Figure 2, the P-type transmission unit 30 of the disaster prevention receiving panel 10 is provided with a receiving circuit 300 for each signal line. Signal line 14(14-1) and common line 14(14-2) are drawn out from the receiving circuit 300 of the P-type transmission unit 30 as signal lines 14, and the voltage-free normally open contact switches 240 of the manual notification devices 24 installed on the four fire hydrant devices 22 are connected in parallel between signal line 14(14-1) and common line 14(14-2), and a termination resistor 25 for monitoring for disconnection is connected to the end. The receiving circuit 300 applies a predetermined line voltage +V between signal line 14(14-1) and common line 14(14-2) by pulling up signal line 14(14-1) to a predetermined power supply voltage +V.

[0095] (c3.Current monitoring section) Next, the current monitoring unit 70 will be described in more detail. The configuration and type of the current monitoring unit 70 shown in Figure 2 are arbitrary, but for example, a programmable logic controller (PLC) equipped with a current measurement function can be used.

[0096] The current monitoring unit 70 measures the current value of the signal line by automatic measurement, all specified measurement, or selective specified measurement, and determines current value abnormalities based on the measurement results. For example, at a predetermined current measurement timing, the current input terminals 84 and 86 of the current monitoring unit 70 are connected in a state where they are interposed in the signal line 14. By switching the measurement line switching unit 72 in this way, the current value flowing through the signal line 14 is measured, and current value abnormalities are determined based on the measurement results. If the control unit 28 receives a fire-related signal from either signal line 14 or 16 and performs predetermined monitoring control, the current monitoring of signal lines 14 and 16 by the current monitoring unit 70 is stopped or canceled.

[0097] Furthermore, the relay unit 88 is equipped with a relay 90 corresponding to each of the signal lines 14 and 16. The current monitoring unit 70 sequentially activates the relays 90 at predetermined current measurement timings and switches the measurement line switching unit 72 so that current input terminals 84 and 86 are inserted into the signal line to be measured. For this reason, the relays 90 used for switching signal lines are equipped with two switching relay contacts. In addition, one end of the coil of each relay 90 is commonly connected to the signal line that becomes the (+) side when a predetermined voltage is applied, and the other end of the coil is individually connected to the signal line that becomes the (-) side. The current monitoring unit 70 activates the coil of the corresponding relay 90 by turning on one of the switching elements provided for each (-) side signal line.

[0098] (c4. Measurement line switching section) The measurement line switching unit 72 will be explained in more detail. As shown in Figure 2, a switching circuit constituting the measurement line switching unit 72 is provided on the signal line 14(14-1) drawn out from the receiving circuit 300 of the P-type transmission unit 30. The first switching relay contact 92 and the second switching relay contact 94 of the relay 90 provided on the relay unit 88 are interposed and connected to the portion of the signal line 14(14-1) of the signal line 14 that has been cut off. When measuring the current value flowing through the signal line 14, the measurement line switching unit 72 switches the first switching relay contact 92 and the second switching relay contact 94 of the relay 90 so that the pair of current input terminals 84 and 86 of the current monitoring unit 70 are interposed and connected to the portion of the signal line 14(14-1) of the signal line 14 that has been cut off.

[0099] Specifically, the first switching relay contact 92 of the relay 90 has fixed terminal a connected to the signal line 14(14-1) on the receiving circuit 300 side (upstream side) of the P-type transmission unit 30 at the disconnection point of the signal line 14(14-1), fixed terminal b connected to the signal line from the current input terminal 84, and switching terminal (common terminal) c connected to the signal line 14(14-1) on the manual notification device 24 side (downstream side) of the terminal equipment group 18(18-1) at the disconnection point of the signal line 14(14-1).

[0100] Furthermore, the second switching relay contact 94 of the relay 90 has fixed terminal a which is unconnected and separated from the disconnected portion of signal line 14 (14-1), fixed terminal b which is connected to the upstream side of the disconnected portion of signal line 14 (14-1), and switching terminal (common terminal) c which is connected to the signal line from the current input terminal 86.

[0101] Therefore, when relay 90 is in a non-operating state and no measurement is being taken, as shown in the figure, the first switching relay contact 92 switches so that the switching terminal c is connected to the fixed terminal a, connecting the upstream and downstream sides of the disconnection portion of signal line 14 (14-1), and the second switching relay contact 94 switches so that the switching terminal c is connected to the fixed terminal a, disconnecting the connection between the upstream side of the disconnection portion of signal line 14 (14-1) and the current input terminal 86. As a result, the line current i, which is determined by the line voltage +V, the termination resistor 25, and the insulation resistance of the wiring cable constituting the signal line 14, flows from signal line 14 (14-1) to common line 14 (14-2) without passing through the current input terminals 84 and 86 of the current monitoring unit 70.

[0102] When relay 90 is activated to measure the line current i, the switching terminal c of the first switching relay contact 92 switches from being connected to fixed terminal a to being connected to fixed terminal b, connecting the downstream side of the disconnected portion of signal line 14 (14-1) to the current input terminal 84. The switching terminal c of the second switching relay contact 94 switches from being connected to fixed terminal a to fixed terminal b, connecting the upstream side of the disconnected portion of signal line 14 (14-1) to the current input terminal 86. As a result, the current input terminals 84 and 86 of the current monitoring unit 70 are interposed and connected to the disconnected portion of signal line 14 (14-1), and the voltage value generated by the current detection resistor in the current monitoring unit 70 is read as digital data by the AD conversion port to measure the current value.

[0103] (c5. Automatic measurement of current value) The automatic measurement of current values ​​by the current monitoring unit 70 will be explained in more detail. In this explanation, refer to Figure 3, which shows the full specified measurement screen of the sub-monitor device used for full specified measurement.

[0104] The monitor screen 120 shown in Figure 3 has a button for all specified measurements 122, a button for selected measurements 124, a measurement record button 126, an error history button 128, and a buzzer stop button 130 located at the bottom of the screen. As indicated by the hatching, operating the button for all specified measurements 122 switches to the all specified measurement screen 132.

[0105] In the upper right corner of the monitor screen 120 are an input button 134 and an output button 136 for setting up automatic measurement. Initially, the input button 134 is set to the ON position, so the current monitoring unit 70 performs automatic measurement, which involves sequentially measuring the current values ​​of all signal lines at a predetermined interval, such as once a day. If the measured current value falls outside a predetermined threshold range, for example, the unit determines that there is a current value abnormality and stores the current value measurement result and the current value abnormality determination result as history data in the memory card 100 provided in the terminal communication unit 75.

[0106] Here, the threshold for determining an abnormal current value includes, for example, an upper limit and a lower limit corresponding to a threshold range. The current monitoring unit 70 determines an upper limit current value abnormality when the current value is equal to or exceeds the upper threshold value, and determines a lower limit current value abnormality when the current value is equal to or falls below the lower threshold value.

[0107] Furthermore, the format of the history data stored by the current monitoring unit 70 on the memory card 100 is arbitrary, but for example, the history data is generated as a text file containing "measurement date, line number, upper threshold value, lower threshold value, measured value, upper current value abnormality flag, lower current value abnormality flag," and if a current value abnormality is detected, the "upper current value abnormality flag" or the "lower current value abnormality flag" is set to "1" and stored on the memory card 100.

[0108] (c6. Measurement of all specified current values) The current monitoring unit 70 will now explain in more detail how to perform a full-specified measurement of current values. When performing a full-specified measurement of current values ​​using the monitor screen 120 switched to the full-specified measurement screen 132 in Figure 3, first, the automatic measurement is canceled by operating the off button 136 located in the automatic measurement section in the upper right. Next, in the type selection unit 140, select "Upbound Manual Notification," which indicates the signal line 14 to which the manual notification device 24 installed in the upbound tunnel 12 (12-1) is connected, as the test target, and operate the start button 142 located in the full-specified measurement section.

[0109] The operation to measure all current values ​​using this monitor screen 120 is detected by the current monitoring unit 70, and the current values ​​of all signal lines 14 connected to the manual notification device 24 installed in the selected uphill tunnel 12 (12-1) are measured sequentially. The measurement results, including the measured current values, are displayed in the measurement details 146. In addition, the measured current value is displayed in the measurement value frame 148 in the lower right for each measured signal line, and the measurement time is displayed in the measurement time frame 150. Furthermore, during the all-specified measurement, the measurement in progress indicator 152 in the upper right of the screen changes to "Measurement in progress" to indicate that the all-specified measurement is being performed.

[0110] In the center of the all-specified measurement screen 132, the measurement details 146 are displayed, showing the measurement results for each signal line, divided into items such as line number (No.), lower threshold value, upper threshold value, and measured value. For example, for line number 002, the measured value is 1.85mA, which exceeds the upper threshold value of 1.00mA, so it is determined to be an upper current value anomaly, and the display for line number 002 changes as shown by the hatching to indicate the current value anomaly. Similarly, for line number 027, the measured value is 0.00mA, which falls below the lower threshold value of 0.01mA, so it is determined to be a lower current value anomaly, and the display for line number 027 changes as shown by the hatching to indicate the current value anomaly. Furthermore, if a current value anomaly is detected in any signal line, the current anomaly value occurrence display 154 changes to indicate that a current value anomaly has been detected.

[0111] Once all specified measurements are complete, the current monitoring unit 70 stores the current value measurement results and the current value abnormality determination results as history data in the memory card 100 provided in the terminal communication unit 75. Furthermore, once all specified current value measurements are complete, the automatic measurement can be resumed by operating the automatic measurement input button 134. If it is desired to stop all specified measurements before they are completed, the all specified measurements can be interrupted by operating the stop button 144 located in the all specified measurement section.

[0112] (c7. Current value selection and measurement) The current value selection and measurement by the current monitoring unit 70 will be explained in more detail. In this explanation, refer to Figure 4, which shows the selection and measurement screen of the sub-monitor device used for selection and measurement.

[0113] As shown in Figure 4, operating the selection / specified measurement button 124 located at the bottom of the monitor screen 120 switches to the illustrated selection / specified measurement screen 160. To perform a selection / specified measurement of the current value using the monitor screen 120 that has switched to the selection / specified measurement screen 160, first, operate the off button 136 located in the automatic measurement section in the upper right to cancel automatic measurement. Next, in the type selection section 140, select, for example, "upbound line manual notification" as the test target, and then select the signal line to be measured by operating the selection buttons 162 and 164 located in the selection / specified measurement section.

[0114] Here, the display changes as shown by the hatching in the measurement details 146, indicating the currently selected signal line. By operating the selection buttons 162 and 164, the changed display moves up or down, allowing you to select any line number. Once you have selected the line number for the specified measurement, operate the start button 166 located in the specified measurement field. Note that in Figure 4, line number 004 is selected.

[0115] The current value selection and measurement operation using this monitor screen 120 is detected by the current monitoring unit 70, and the current value of the signal line 14 with line number 004 to the manual notification device 24 located in the up-line tunnel 12 (12-1) is measured, and the measurement results, including the measured current value, are displayed in the measurement details 146. In addition, when the selection and specification measurement is started, the measurement in progress display 152 changes to "Measuring" to indicate that the selection and specification measurement is being performed.

[0116] Here, the measured value for line number 004, which was selected for measurement, is 1.25mA, and since this exceeds the threshold upper limit of 1.00mA, it is determined that there is an abnormal upper limit current value. The display for line number 004 changes as shown by the hatching, and the current value abnormality occurrence display 154 also changes to indicate that a current value abnormality has been detected.

[0117] To end the selected current value measurement, the user can operate the stop button 168 in the selected measurement section, and then the on button 134 in the automatic measurement section to return to automatic current value measurement. The current monitoring unit 70 may also store the measurement results of the current value and the current value abnormality determination results as history data in the memory card 100 provided in the terminal communication unit 75 when the selected measurement is completed.

[0118] (c8. Memory card with communication function) A memory card with communication functionality will be explained in more detail. The memory card 100 provided in the terminal communication unit 75 shown in Figure 2 is, for example, a removable electronic storage medium that can be attached to devices and equipment. It is equipped with flash memory that can read and write data and its input / output interface, and the stored data remains even when the power to the device or equipment is turned off. This includes SD memory cards and the like.

[0119] Furthermore, the memory card 100 of the terminal communication unit 75 used in this embodiment includes a communication unit. The functions and configuration of the communication unit are arbitrary, but for example, in this embodiment, as shown in Figure 2, a wireless LAN client 102 is provided, and as the wireless LAN client 102, for example, a Wi-Fi (registered trademark) client is provided. The wireless LAN client 102 is capable of transmitting the current monitoring history data stored in the memory card 100 to external devices and equipment via a communication network equipped with an external wireless LAN access point.

[0120] [d. General-purpose external communication network] The general-purpose external communication network will be explained in more detail. As shown in Figure 2, the general-purpose external communication network 76 connects the current monitoring unit 70 installed in the disaster prevention receiving panel 10 with the current monitoring higher-level station equipment 78 installed as higher-level equipment. It utilizes a general-purpose communication network that is made publicly available for use by general users, including the business entity that operates and manages the disaster prevention receiving panel 10 and the current monitoring higher-level station equipment 78.

[0121] The functions and configuration of the general-purpose external communication network 76 are arbitrary, but for example, it can be configured to connect the terminal communication equipment 104 installed on the tunnel side where the disaster prevention receiving panel 10 is installed with the current monitoring upper-level station equipment 78 via the mobile phone network 112. Alternatively, the mobile phone network 112 may be replaced with an internet connection, or a communication network combining the mobile phone network 112 and an internet connection may be used.

[0122] Furthermore, the configuration and functions of the terminal communication equipment 104 and the current monitoring higher-level station equipment 78 are arbitrary, but for example, the terminal communication equipment 104 includes a wireless LAN access point 106, a router 108, and a mail processing unit 110, and the current monitoring higher-level station equipment 78 includes a router 114, a mail processing unit 116, and a monitoring device 118.

[0123] The wireless LAN access point 106 communicates with the terminal communication equipment 104 and the terminal communication unit 75 of the disaster prevention receiver panel 10. The wireless LAN access point 106 and the wireless LAN client 102, which is integrated into the memory card 100 of the terminal communication unit 75, communicate according to a predetermined wireless LAN communication protocol. More specifically, the wireless LAN access point 106 and the wireless LAN client 102 are a Wi-Fi® access point and a Wi-Fi® client, and communicate according to the Wi-Fi® communication protocol.

[0124] Routers 108 and 114 communicate via email between email processing units 110 and 116 via the mobile phone network 112. The configuration and functions of routers 108 and 114 are arbitrary, but for example, routers equipped with LTE-SIM cards are used. A SIM card (Subscriber Identity Module Card) is an IC card necessary for communication via the mobile phone network 112, on which a unique identification number (ID) for identifying a telephone number is recorded.

[0125] Furthermore, LTE (Long Term Evolution) is a mobile phone communication standard that sits between third-generation (3G) and fourth-generation (4G) mobile phones, enabling high-speed data communication with a maximum download speed of 100Mbps or more and an upload speed of 50Mbps or more. Note that the communication standard using the mobile phone network 112 is not limited to LTE; any appropriate communication standard such as 4G or 5G can be selected.

[0126] In this embodiment, when a request for transmission of current monitoring history data is made to the disaster prevention receiving panel 10 based on the operation of an operator at the current monitoring higher-level station equipment 78, the requested current monitoring history data stored in the memory card 100 is read and transmitted to the current monitoring higher-level station equipment 78 for display on the monitoring device 118.

[0127] Therefore, the memory card 100 of the disaster prevention receiver panel 10 responds to a transmission request from the higher-level equipment received by the wireless LAN client 102 by reading the history data stored as, for example, text file data, and transmits the read history data from the wireless LAN client 102 to the wireless LAN access point 106 of the terminal communication equipment 104.

[0128] The mail processing unit 110 of the terminal communication equipment 104 creates an email addressed to the mail processing unit 116 of the current monitoring upper station equipment 78, attaches the history data received by the wireless LAN access point 106 as a file, and sends the email with the history data file attached via the router 108.

[0129] Emails sent from the terminal communication equipment 104 are received by the email processing unit 116 via the mobile phone network 112 and the router 114 of the current monitoring upper-level station equipment 78. The email processing unit 116 opens the file attached to the received email, stores the current monitoring history data in memory, and displays it on the monitor device 118 in the same manner as the display of the sub-monitor device 74 shown in Figures 3 and 4, enabling verification by personnel of the current monitoring upper-level station equipment 78.

[0130] Here, the request from the personnel of the current monitoring higher-level station equipment 78 to transmit current monitoring history data to the disaster prevention receiving panel 10 allows for the specification of predetermined filtering conditions. The filtering conditions that can be specified are arbitrary, but for example, it is possible to specify the systems corresponding to the up-line tunnel and the down-line tunnel, terminal equipment such as manual notification devices, fire hydrant activation devices, and duct temperature detectors, as well as section numbers, etc., as filtering conditions. It is also possible to request transmission to extract and transmit arbitrary history data, such as the result of determining abnormal current values ​​in signal lines, or the measurement results of current values.

[0131] Therefore, the personnel of the current monitoring higher-level station equipment 78 can extract and display specific historical data from the vast amount of historical data stored in the memory card 100 of the disaster prevention receiving panel 10, enabling them to efficiently make judgments about specific line degradation conditions based on the historical data.

[0132] [e. Control operation of the current monitoring unit] The control operation of the current monitoring unit will be explained in more detail. This explanation will refer to the flowchart in Figure 5, which shows an example of current monitoring control by the current monitoring unit of the disaster prevention receiving panel.

[0133] As shown in Figure 5, the current monitoring unit 70 is initially set to automatically measure the current value. When it determines that a predetermined measurement timing, for example, once a day, has been reached (step S1), it performs a current value measurement process to sequentially measure the current values ​​of all signal lines 14 and 16 (step S2). Subsequently, if the measured current value is outside a predetermined threshold range, for example, it performs a current value anomaly determination process to determine that it is an anomaly (step S3). Then, it performs a history data storage process to generate history data including the current value measurement result and the current value anomaly determination result and store it in the memory card 100 (step S4).

[0134] Furthermore, if a request for transmission of historical data is received from the higher-level current monitoring station equipment 78 (step S5), the requested historical data is read from the memory card 100 and transmitted to the higher-level current monitoring station equipment 78 (step S6).

[0135] Furthermore, even when all-specified measurement or selective-specified measurement is set, the current monitoring unit 70 will determine the measurement timing corresponding to each measurement start operation and perform current value measurement processing, current value abnormality determination processing, and history data storage processing (steps S1 to S4). In addition, if a request for transmission of history data is received from the current monitoring higher-level station equipment 78, it may also be possible to transmit history data for automatic and manual measurements.

[0136] [f. Tunnel disaster prevention system using a dedicated external communication network] A more detailed explanation will be provided regarding the tunnel disaster prevention system using a dedicated external communication network. This explanation will refer to Figure 6, which illustrates the current monitoring function of the disaster prevention receiving panel using the dedicated external communication network.

[0137] As shown in Figure 6, the P-type transmission unit 30, current monitoring unit 70, measurement line switching unit 72, and relay unit 88 provided in the disaster prevention receiving panel 10 are the same as in the embodiment shown in Figure 2. They measure the current values ​​flowing through the signal lines 14 and 16 and determine if there is an abnormality in the current value. The measurement results of the current value and the determination results of the abnormality in the current value are stored as history data in the memory card 200.

[0138] The history data stored in the memory card 200 is displayed on the sub-monitor device 74 by the display control unit 202. In addition, when the memory card 200 receives a request to transmit history data from the current monitoring superior station equipment 78, which is a higher-level equipment in current monitoring, the history data stored in the memory card 200 is read from the memory card 200 and transmitted to the current monitoring superior station equipment 78.

[0139] The disaster prevention receiving panel 10 and the current monitoring upper-level station equipment 78 are connected by a dedicated external communication network 58. The dedicated external communication network 58 is the external communication network used between the upper-level station equipment 62 and the IG slave station equipment 42 of the remote monitoring and control equipment 60 shown in Figure 1. The type and configuration of the dedicated external communication network 58 are arbitrary, but for example, a LAN communication unit 206 and a router 208 are provided on the tunnel side where the disaster prevention receiving panel 10 is installed, and a LAN communication unit 214 and a router 212 are provided on the current monitoring upper-level station equipment 78 side, and a predetermined intranetwork 210 connects router 208 and router 212. The configuration and functions of the LAN communication units 206 and 214 are also arbitrary, but for example, an Ethernet unit is used and communication is performed in accordance with the Ethernet communication protocol.

[0140] The dedicated external communication network 58 configured in this way uses an ID and password that are not made public, and enables communication connections only between equipment and devices belonging to the business entity that owns, operates, and manages the tunnel disaster prevention system. It utilizes a dedicated communication network that is not available to the general public.

[0141] Furthermore, the disaster prevention receiving panel 10 is equipped with a file transfer communication unit 204, which is connected to the LAN communication unit 206 of the dedicated external communication network 58. The communication connection between the file transfer communication unit 204 and the LAN communication unit 206 is optional, but a known field network or PLC link corresponding to the communication connection of the programmable logic controller (PLC) constituting the current monitoring unit 70 is used. In addition, the current monitoring higher-level station equipment 78 is equipped with a processing unit 216 and a monitoring device 218. Note that a server may be used instead of the processing unit 216.

[0142] When the file transfer communication unit 204 of the disaster prevention receiving panel 10 receives a request from the processing unit 216 of the current monitoring higher-level station equipment 78 to transmit current monitoring history data via the dedicated external communication network 58, it reads the requested history data stored in the memory card 200 and transmits it to the current monitoring higher-level station equipment 78 via the dedicated external communication network 58. The processing unit 216 of the current monitoring higher-level station equipment 78 then displays the received history data on the monitor device 218.

[0143] Even in a tunnel disaster prevention system using such a dedicated external communication network 58, when it is difficult for staff to be stationed on the tunnel side on a rotating basis or to conduct regular patrols, the current monitoring higher-level station equipment 78 can request the transmission of historical data. The disaster prevention receiver panel 10 will then acquire historical data of current value measurement results and current value anomaly judgment results stored in the memory card 200, display it on the screen of, for example, the monitoring device 218, and allow the higher-level equipment, the current monitoring higher-level station equipment 78, to check for and address signal lines that have deteriorated over time.

[0144] [g. Variations of the present invention] Modifications of the disaster prevention system according to the present invention will now be described. In addition to the embodiments described above, the communication system of the present invention includes the following modifications.

[0145] (Memory card) The above embodiment uses a memory card to store current monitoring history data, but is not limited to this; any electronic recording medium capable of storing history data is acceptable.

[0146] (Enclosure structure) In the above embodiment, the current monitoring unit is provided in the same enclosure as the disaster prevention receiver panel, but this does not preclude the current monitoring unit from being in a separate enclosure.

[0147] (Monitoring device for disaster prevention receiving panel) In the above embodiment, a main monitor device is provided for monitoring and controlling emergency equipment by the disaster prevention receiving panel, and a sub-monitor device is provided for monitoring and controlling current in the current monitoring unit. However, a single monitor device may be provided for both monitoring and controlling emergency equipment and monitoring and controlling current in the current monitoring unit.

[0148] (Current measurement and control by higher-level equipment) In the above embodiment, the current monitoring unit installed in the disaster prevention receiving panel switches between automatic measurement, all-specified measurement, and selectively specified measurement. However, the current monitoring unit in the disaster prevention receiving panel may also switch between automatic measurement, all-specified measurement, and selectively specified measurement by remote operation from a higher-level current monitoring station.

[0149] (others) Furthermore, the present invention includes appropriate modifications that do not impair its purpose and advantages, and is not limited by the numerical values ​​shown in the above embodiments. [Explanation of symbols]

[0150] 10: Disaster Prevention Receiving Panel 12(12-1): Upbound Tunnel 12(12-2): Downbound Tunnel 14,16: Signaling circuits 18(18-1)-18(18-n), 20(20-1)-20(20-n): Terminal equipment group 22: Fire hydrant system 24:Manual notification device 25: Termination resistor 26: Fire pump starting device 28: Control Unit 30,40: P-type transmission section 32: Main monitor device 34:Alarm section 35: Display section 36:Operation unit 38: Data transmission section 42:IG slave station equipment 44: Ventilation equipment 46: Alarm display board equipment 48: Radio rebroadcasting equipment 50: Television surveillance equipment 52: Lighting equipment 54: Fire pump equipment 56: Cooling pump equipment 58: Dedicated external communication network 60: Remote monitoring and control equipment 62: Upper station equipment 70: Current monitoring section 72: Measurement line switching unit 74: Sub-monitor device 75: Terminal Communications Unit 76: General-purpose external communication network 78: Current monitoring upper station equipment 84, 86: Current input terminals 88: Relay Unit 90: Relay 92: First switching relay contact 94: Second switching relay contact 100,200: Memory card 102: Wireless LAN Client 104: Terminal communication equipment 106: Wireless LAN access point 108,114,208,212: Router 110,116: Mail Processing Unit 112: Mobile phone network 118,218: Monitoring device 202: Display Control Unit 204: File Transfer Communication Unit 206,214: LAN Communications Department 210: Intranetwork 216: Processing Unit 300: Receiving circuit

Claims

1. Disaster prevention receiving panel, A terminal device that outputs a predetermined signal related to the abnormality to the disaster prevention receiving panel via a signal line when an abnormality occurs, A current monitoring unit measures the current value flowing through the signal line and stores historical data of the measurement results, and when it receives a transmission request from a higher-level device connected via a predetermined communication network, it extracts at least the result of determining an abnormal current value in the signal line from the historical data and transmits it to the higher-level device. A monitoring device that displays the aforementioned historical data, A disaster prevention system characterized by having the following features.

2. A disaster prevention system according to claim 1, The current monitoring unit is characterized by extracting the determination result of an abnormal current value in the signal line and / or the measurement result of the current value from the stored history data according to predetermined filtering conditions included in the transmission request from the higher-level equipment, and transmitting it to the higher-level equipment.

3. A disaster prevention system according to claim 1 or 2, The current monitoring unit is characterized by being remotely controlled from the higher-level equipment.

4. A disaster prevention system according to any one of claims 1 to 3, The disaster prevention system is characterized in that the monitoring device is installed in the higher-level equipment.

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