Vibration sensing device and switch

Abstract

To provide an improved switch.SOLUTION: A switch includes: overcurrent detection means which detects an overcurrent accident at an electric path; power failure detection means which detects a power failure at the electric path; trip operation means which automatically opens the electric path; a control device; and a vibration sensing device including vibration sensing means which detects vibration. In the switch, the vibration sensing device includes: a vibration detection circuit to which an output signal of the vibration detection means is input; a power failure detection circuit to which an output signal of the power failure detection means is input; and a trip circuit which causes trip operation means to execute trip operation. When the vibration detection circuit detects vibration and the power failure detection circuit continuously detects the power failure of the electric path for a predetermined time, the control device directly outputs a signal from the trip circuit to the trip operation means to control the trip operation means to execute trip operation.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This specification discloses a vibration sensing device attached to a switch that opens and closes an electric circuit, and a technique relating to a switch having a vibration sensing function. [Background technology]

[0002] Patent Document 1 discloses a switch that can prevent secondary disasters, such as fires, caused by energization of electrical equipment of an electric power consumer after the power supply is resumed when a power outage occurs due to a disaster such as an earthquake. The switch of Patent Document 1 does not trip (does not open) the switch when an overcurrent accident occurs in an electric circuit, but keeps the tripped state in a standby state. The switch then trips (opens) the switch when a power outage is detected by a power outage detection means, or when vibration is detected by a vibration detection means and a power outage is detected by the power outage detection means. In other words, the switch of Patent Document 1 does not trip when vibration is detected by the vibration detection means alone, but trips when a power outage is detected together with vibration. This prevents the switch from tripping (misoperating) when vibrations that are not caused by a disaster such as an earthquake are detected, such as when a large vehicle passes around the switch and causes vibrations. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-273389 Summary of the Invention [Problem to be solved by the invention]

[0004] The switch disclosed in Patent Document 1 includes a control device for controlling tripping. The control device includes an overcurrent detection circuit to which a detection signal from an overcurrent detection means is input, and a power outage detection circuit to which the voltage state of the electrical circuit is input. The control device determines whether to open the switch (whether to perform a tripping operation or to prepare for a tripping operation) using the output signals from the overcurrent detection circuit and the power outage detection circuit. Patent Document 1 also discloses two types of switch. In one, the output signal from a vibration detection means is input to the overcurrent detection circuit. In this case, if a power outage occurs due to vibrations such as an earthquake, the same steps as in the case of a power outage due to an overcurrent accident are taken to determine whether to open the switch. In other words, the overcurrent detection circuit also functions as a vibration detection circuit. Therefore, the specifications of the vibration detection means are limited by the specifications of the overcurrent detection means (overcurrent detection circuit).

[0005] Another switch disclosed in Patent Document 1 has a control device that includes a vibration detection circuit, separate from the overcurrent detection circuit, and an OR circuit to which both the output signal of the overcurrent detection circuit and the output signal of the vibration detection circuit are input. In this case, the specifications of the vibration sensing means are not limited to the specifications of the overcurrent detection means. However, this requires the addition of an OR circuit, which increases the number of components arranged in the control device. Furthermore, when performing maintenance or replacement of the vibration detection circuit, it is necessary to maintain or replace the control device itself. Therefore, there is a demand for a more improved switch. The purpose of this specification is to provide an improved switch and a vibration sensing device attached to the switch that have not been seen in the past. [Means for solving the problem]

[0006] One embodiment of the vibration sensing device disclosed in this specification is attached to a switch having overcurrent detection means for detecting overcurrent faults in an electric circuit, power outage detection means for detecting power outages in the electric circuit, tripping means for automatically opening the electric circuit, and a control device that detects vibrations and causes the tripping means to trip when a power outage in the electric circuit has been detected for a predetermined continuous period of time.The vibration sensing device may also include a power outage detection circuit to which an output signal from the power outage detection means is input, a vibration detection circuit that detects vibrations, and a trip circuit that causes the tripping means to perform a tripping operation.

[0007] Another embodiment of the vibration sensing device disclosed in this specification is attached to a switch having overcurrent detection means for detecting overcurrent faults in an electric circuit, ground fault detection means for detecting ground faults in the electric circuit, power outage detection means for detecting power outages in the electric circuit, tripping means for automatically opening the electric circuit, and a control device that detects vibrations and causes the tripping means to trip when a power outage in the electric circuit has been detected for a predetermined continuous period of time.The vibration sensing device may also include a power outage detection circuit to which an output signal from the power outage detection means is input, a vibration detection circuit that detects vibrations, and a trip circuit that causes the tripping means to perform a tripping operation.

[0008] Another embodiment of the vibration sensing device disclosed in this specification is attached to a switch having ground fault detection means for detecting a ground fault in an electric circuit, vibration sensing means for detecting vibrations, tripping means for automatically opening the electric circuit, and a control device that detects vibrations and causes the tripping means to trip when it detects a power outage in the electric circuit for a predetermined continuous period of time. The vibration sensing device may also include a power outage detection circuit to which a signal indicating a power outage in the electric circuit is input, a vibration detection circuit for detecting vibrations, and a trip circuit that causes the tripping means to perform a tripping operation.

[0009] This specification also discloses a switch. One embodiment of the switch disclosed in this specification includes an overcurrent detection device that detects an overcurrent fault in an electric circuit, a power failure detection device that detects a power failure in the electric circuit, a tripping operation device that automatically opens the electric circuit, a control device, and a vibration detection device that is provided with vibration detection means that detects vibrations. In this switch, the vibration detection device may include a vibration detection circuit to which an output signal from the vibration detection device is input, a power failure detection circuit to which an output signal from the power failure detection device is input, and a trip circuit that causes the tripping operation device to perform a tripping operation. Furthermore, when the vibration detection circuit detects vibration and the power failure detection circuit detects a power failure in the electric circuit for a predetermined continuous time, the control device may output a signal directly from the trip circuit to the tripping operation device to cause the tripping operation device to perform a tripping operation.

[0010] Another embodiment of the switchgear disclosed in this specification includes a ground fault detection means for detecting a ground fault in an electric circuit, a vibration sensing means for detecting vibrations, a tripping operation means for automatically opening the electric circuit, a control device, and a vibration sensing device provided with the vibration sensing means for detecting vibrations. In this switchgear, the vibration sensing device may include a vibration detection circuit to which an output signal from the vibration detection means is input, a power failure detection circuit to which a signal indicating a power failure is input, and a trip circuit to cause the tripping operation means to perform a tripping operation. Furthermore, when the vibration detection circuit detects vibrations and the power failure detection circuit detects a power failure in the electric circuit for a predetermined continuous time, the control device may output a signal directly from the trip circuit to the tripping operation means to cause the tripping operation means to perform a tripping operation.

[0011] Another embodiment of the switchgear disclosed in this specification includes an overcurrent detection means for detecting an overcurrent fault in an electric circuit, a power failure detection means for detecting a power failure in the electric circuit, a tripping operation means for automatically opening the electric circuit, a vibration sensing means for detecting vibrations, and a control device. This switchgear may further include a power failure detection circuit to which an output signal from the power failure detection means is input, a vibration detection circuit for detecting vibrations from the vibration sensing means, and a vibration sensing device for outputting a tripping operation signal when the vibration detection circuit detects vibrations and the power failure detection circuit detects a power failure in the electric circuit for a predetermined continuous time. The control device may also include an input terminal for inputting a tripping operation signal from the vibration sensing device, and may cause the tripping operation means to perform a tripping operation when the tripping operation signal is input to the input terminal from the vibration sensing device.

[0012] Another embodiment of the switchgear disclosed in this specification includes a ground fault detection means for detecting a ground fault in an electric circuit, a vibration sensing means for detecting vibrations, a control device, a tripping operation means for automatically opening the electric circuit, and the control device. This switchgear may further include a power outage detection means for detecting a power outage in the electric circuit, a power outage detection circuit to which an output signal of the power outage detection means is input, a vibration detection circuit for detecting vibrations of the vibration sensing means, and a vibration sensing device for outputting a tripping operation signal when the vibration detection circuit detects vibrations and the power outage detection circuit detects a power outage in the electric circuit for a predetermined continuous time. The control device may also include an input terminal for inputting a tripping operation signal from the vibration sensing device, and may cause the tripping operation means to perform a tripping operation when the tripping operation signal is input to the input terminal from the vibration sensing device. [Brief explanation of the drawings]

[0013] [Figure 1] 1 shows a schematic diagram of a first embodiment. [Figure 2] 1 shows a block diagram of a switch according to a first embodiment. [Figure 3] FIG. 2 is a block diagram of a modified example of the switch of the first embodiment. [Figure 4] FIG. 2 is a block diagram of a modified example of the switch of the first embodiment. [Figure 5]FIG. 2 is a block diagram of a modified example of the switch of the first embodiment. [Figure 6] FIG. 2 is a block diagram of a modified example of the switch of the first embodiment. [Figure 7] 1 shows a schematic diagram of a second embodiment. [Figure 8] FIG. 10 is a block diagram of a modified example of the switch of the second embodiment. [Figure 9] FIG. 10 is a block diagram of a modified example of the switch of the second embodiment. [Figure 10] FIG. 10 is a block diagram of a modified example of the switch of the second embodiment. [Figure 11] FIG. 10 is a block diagram of a modified example of the switch of the second embodiment. [Figure 12] FIG. 10 is a block diagram of a modified example of the switch of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] The first switch disclosed in this specification may include an overcurrent detection means for detecting an overcurrent fault in an electric circuit, a power outage detection means for detecting a power outage in the electric circuit, a vibration sensing means for detecting vibrations, a tripping operation means for automatically opening the electric circuit, and a control device. The overcurrent detection means, the power outage detection means, the vibration sensing means, the tripping operation means, and the control device may all be packaged together. Alternatively, some of the overcurrent detection means, the power outage detection means, the vibration sensing means, and the tripping operation means may be located in a switch body separate from the control device. In this case, the control device and the switch body can be installed in different locations by connecting them with a cable. For example, the control device can be installed at the bottom of the utility pole and the switch body can be installed at the top of the utility pole.

[0015] The first switch may prepare for tripping and close the circuit when an overcurrent fault is detected in the electrical circuit. The switch may then trip when both an overcurrent fault and a power outage in the electrical circuit are detected by the power outage detection means. The switch may also trip when vibration is detected by the vibration sensing means and a power outage in the electrical circuit is detected by the power outage detection means. The first switch may have a signal path that is independent of the signal path that is used when switching the switch from preparation to execution of tripping in response to the detection of an overcurrent fault. That is, when switching between preparation and execution of tripping in response to the detection of vibration and a power outage, the switch may bypass a circuit that receives an overcurrent detection signal from the overcurrent detection means and output a trip permission signal directly to the tripping means. This allows a circuit that performs a trip when vibration and a power outage are detected to be designed without being affected by the specifications of a circuit that switches between preparation and execution of tripping in response to the detection of an overcurrent fault.

[0016] In addition to the above configuration, the first switch may also include a ground fault detection means for detecting a ground fault in the electric circuit. In this case, an overcurrent detection signal may be input to the operation determination circuit when the overcurrent detection means detects an overcurrent fault in the electric circuit, and a ground fault detection signal may also be input to the operation determination circuit when the ground fault detection means detects a ground fault in the electric circuit. When the overcurrent detection signal is input to the operation determination circuit, the tripping operation may be prepared, and when the overcurrent detection signal is not input to the operation determination circuit, the tripping operation may be performed. In this case, too, the tripping operation permission signal that is output when a tripping operation is performed due to the detection of vibration and a power outage may be input directly to the tripping operation means without passing through the operation determination circuit.

[0017] The second switch disclosed in this specification may include an overcurrent detection means for detecting an overcurrent fault in an electric circuit, a power failure detection means for detecting a power failure in the electric circuit, a vibration sensing means for detecting vibrations, a tripping operation means for automatically opening the electric circuit, and a control device. At least the vibration sensing means of the second switch may be separate from the control device. The control device may include an input terminal for inputting a tripping operation permission signal determined using a detection signal received when the vibration sensing means detects vibrations and a detection signal received when the power failure detection means detects a power failure. The second switch may prepare for a tripping operation of the switch and close the electric circuit when an overcurrent fault in the electric circuit is detected. The second switch may then perform a tripping operation when both an overcurrent fault and a power failure in the electric circuit are detected by the power failure detection means. The second switch may also perform a tripping operation when vibration is detected by the vibration sensing means and a power failure in the electric circuit are detected by the power failure detection means.

[0018] The second switch generates a trip operation permission signal in response to vibration detection and power outage detection outside the control device. Therefore, when adjusting whether to perform a trip operation based on the magnitude of the vibration (e.g., seismic intensity) and the length of the power outage, the adjustment can be made without changing the configuration within the control device. In addition, since there is no need to process the detection signal from the vibration sensing means within the control device, the circuitry within the control device can be simplified.

[0019] In addition to the above configuration, the second switch may also include a ground fault detection means for detecting a ground fault in the electric circuit. In this case, an overcurrent detection signal may be input to the operation determination circuit when the overcurrent detection means detects an overcurrent fault in the electric circuit, and a ground fault detection signal may also be input to the operation determination circuit when the ground fault detection means detects a ground fault in the electric circuit. When the overcurrent detection signal is input to the operation determination circuit, the switch may prepare for a tripping operation, and when the overcurrent detection signal is not input to the operation determination circuit, the switch may perform a tripping operation.

[0020] (First Example) With reference to FIG. 1, a high-voltage air switch 100 will be outlined. The high-voltage air switch 100 is an example of a switch, and is an overcurrent lock type (SOG type) high-voltage air switch. The high-voltage air switch 100 includes a switch body 50, a control device 30 that controls the operation of the switch body 50, and a vibration sensor 10. The switch body 50 and the control device 30 are connected by a cable. The switch body 50 is installed at the top of a utility pole (not shown), and the control device 30 is installed at the bottom of the utility pole. The vibration sensor 10 is connected to the control device 30 by wiring 92, 98. More specifically, the vibration sensor 10 is connected to the output part of a control power supply transformer 80 and the input part of a trip coil 56, which will be described later. First, the internal configuration of the switch body 50 will be described.

[0021] The switch body 50 is provided on an electric circuit 52. More specifically, the switch body 50 is connected to an electric power supply side (power supply side) electric circuit 52a and a consumer side (load side) electric circuit 52b, electrically connecting the two (closing the electric circuit 52). The electric circuit 52 has an R phase, an S phase, and a T phase. On the electric circuit 52, a zero-phase current transformer 58, a switching unit 54, a control power supply transformer 80, and a current detection unit 60 are arranged in this order from the power supply side to the load side.

[0022] The zero-phase-sequence current transformer 58 detects a zero-phase-sequence current (ground fault current) occurring in the electric circuit 52. Both ends of the zero-phase-sequence current transformer 58 are connected to the control device 30. As will be described in detail later, both ends of the zero-phase-sequence current transformer 58 are connected to terminals 90d of a terminal block 90 provided in the control device 30, and are connected to the ground fault detection circuit 31 (see FIG. 2). When the zero-phase-sequence current is detected by the zero-phase-sequence current transformer 58, a detection signal is output to the control device 30 (ground fault detection circuit 31).

[0023] The switching unit 54 includes switches 54r, 54s, and 54t. The switches 54r, 54s, and 54t are respectively provided on the R phase, S phase, and T phase of the electric circuit 52. When the switching unit 54 is opened, the electric circuit 52 is opened, and when the switching unit 54 is closed, the electric circuit 52 is closed.

[0024] The control power supply transformer 80 has two coils with different numbers of turns. The primary coil is connected to two phases (S-phase and T-phase) of the electric circuit 52. The secondary coil is connected to a terminal 90b of a terminal block 90 provided in the control device 30, and is connected to the power supply circuit 33 and the energy storage circuit 35 (see FIG. 2). A wiring 92 is also connected to the terminal 90b. The wiring 92 is connected to a terminal 96b of a terminal block 96 provided in the vibration sensing device 10, and is connected to the power supply circuit 16 (see FIG. 2). In other words, the secondary coil is also connected to the power supply circuit 16 in the vibration sensing device 10. The control power supply transformer 80 can generate power to drive the circuits in the control device 30. Since the high-voltage air contactor 100 can secure power to drive the circuits in the control device 30 by utilizing the voltage of the electric circuit 52, it is possible to omit providing a separate power supply just for driving the circuits in the control device 30.

[0025] The current detection unit 60 includes current transformers 60r and 60t. As described above, the current detection unit 60 is located downstream of the switching unit 54 (on the consumer-side electrical circuit 52b side). Therefore, the current transformers 60r and 60t can detect the load currents flowing through the R and T phases of the electrical circuit 52, respectively. The current detection unit 60 is connected to a microswitch 70. The microswitch 70 is a double-throw type and includes a normally closed contact 72, a normally open contact 74, and a common contact 76. The normally closed contact 72 and the common contact 76 are connected to terminal 90a of a terminal block 90 provided in the control device 30 and are connected to the overcurrent detection circuit 36 ​​(see FIG. 2). When the current detection unit 60 (current transformers 60r, 60t) detects a current equal to or greater than the overcurrent detection value, the normally closed contact 72 and the common contact 76 of the microswitch 70 are connected (the normally closed contact 72 is closed). When the normally closed contact 72 and the common contact 76 are connected, a detection signal is output to the control device 30. In addition, the normally open contact 74 is connected to a trip coil 56. The trip coil 56 is connected to a terminal 90c of a terminal block 90 provided in the control device 30, and is also connected to the normally open contact 41 (see FIG. 2). The trip coil 56 trips (opens) the switches 54r, 54s, and 54t of the opening / closing unit 54.

[0026] The control device 30 and the vibration sensing device 10 will be described with reference to Figure 2. A plurality of circuits and normally open contacts 41 are provided within the control device 30. The ground fault detection circuit 31 is connected to the zero-phase-sequence current transformer 58 via terminal 90d of the terminal block 90 (see also Figure 1), and outputs a ground fault detection signal to the operation determination circuit 32 when it detects an output signal from the zero-phase-sequence current transformer 58.

[0027] The power supply circuit 33 is connected to the control power supply transformer 80 via terminal 90b of the terminal block 90 (see also FIG. 1), and smoothes the line voltage between the S phase and the T phase of the electric circuit 52 and converts it into a DC voltage. The power supply circuit 33 is also connected to a power outage detection circuit 34. Therefore, when a power outage occurs in the electric circuit 52, the power supply from the power supply circuit 33 stops, and the power outage detection circuit 34 can determine that the electric circuit 52 has experienced a power outage. When the power outage detection circuit 34 determines that the electric circuit 52 has experienced a power outage, it outputs a power outage detection signal to the AND circuit 37. Although not shown in the figure, the DC voltage converted by the power supply circuit 33 is also supplied to circuits other than the power outage detection circuit 34.

[0028] The energy storage circuit 35 is also connected to the control power supply transformer 80 via terminal 90b of the terminal block 90. ​​The energy storage circuit 35 stores the line voltage between the S phase and the T phase of the electric circuit 52 as a power source for exciting the trip coil 56 (see also FIG. 1). A normally open contact 41 is provided between the energy storage circuit 35 and the trip coil 56. When the normally open contact 41 closes, the power stored in the energy storage circuit 35 is supplied to the trip coil 56, which is excited and causes the switching unit 54 to trip.

[0029] The overcurrent detection circuit 36 ​​is connected to the current detection unit 60 via a terminal 90a of the terminal block 90 (see also FIG. 1), and when an overcurrent detection signal is input from the current detection unit 60, it outputs an abnormality detection signal to the AND circuit 37 and the lock circuit 38. When the abnormality detection signal is input, the lock circuit 38 outputs a lock signal to the operation determination circuit 32 to lock the tripping operation of the switching unit 54. In other words, when the lock signal is input to the lock circuit 38, the opening operation of the switching unit 54 is prohibited.

[0030] When a ground fault detection signal is input from the ground fault detection circuit 31, the operation determination circuit 32 determines whether or not a lock signal is input from the lock circuit 38. When a lock signal is not input, the operation determination circuit 32 outputs a trip operation permission signal to the OR circuit 39, and when a lock signal is input, the operation determination circuit 32 does not output a trip operation permission signal to the OR circuit 39.

[0031] The AND circuit 37 outputs a trip operation permission signal to the OR circuit 39 when it receives both the power failure detection signal from the power failure detection circuit 34 and the abnormality detection signal from the overcurrent detection circuit 36. That is, the AND circuit 37 does not output a trip operation permission signal to the OR circuit 39 when it receives only the power failure detection signal from the power failure detection circuit 34 or only the abnormality detection signal from the overcurrent detection circuit 36. The OR circuit 39 outputs a trip operation request signal to the operation output circuit 40 when it receives the trip operation permission signal from the operation determination circuit 32 or the trip operation permission signal from the AND circuit 37. The OR circuit 39 also outputs a trip operation request signal to the operation output circuit 40 when it receives trip operation permission signals from both the operation determination circuit 32 and the AND circuit 37.

[0032] When a trip operation request signal is input from the OR circuit 39, the operation output circuit 40 excites an excitation coil (not shown) to close the normally open contact 41. As a result, power is supplied from the energy storage circuit 35 to the trip coil 56 via terminal 90c of the terminal block 90, causing the switching unit 54 to trip. The terminal 90c of the terminal block 90 is connected by a wire 98 to a terminal 96c of a terminal block 96 provided inside the vibration sensing device 10.

[0033] The vibration sensing device 10 is equipped with a trip circuit 26, normally open contacts 28, a power supply circuit 16, a power outage detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, and an operation delay timer circuit 4. When the vibration sensor 14 detects vibrations of a predetermined value or greater, it outputs a detection signal to the vibration detection circuit 12. The vibration sensor 14 is adjusted to output a detection signal when it detects vibrations equivalent to a seismic intensity of 5, for example. The vibration sensing device 10 can be installed at the bottom of a utility pole, similar to the control device 30. The vibration sensing device 10 can be installed above, below, to the left, or to the right of the control device 30.

[0034] When a detection signal is input from the vibration sensor 14, the vibration detection circuit 12 outputs a vibration detection signal to the reset timer circuit 8 and the operation delay timer circuit 4. The reset timer circuit 8 starts counting when the input of the vibration detection signal from the vibration detection circuit 12 stops, and outputs a reset signal to the vibration sensor 14 when a predetermined time (e.g., 5 seconds) has elapsed. When the reset signal is input from the reset timer circuit 8, the vibration sensor 14 returns to its initial state. The predetermined time for the reset timer circuit 8 is arbitrary and may be, for example, 1 minute, 10 minutes, or 1 hour.

[0035] The power supply circuit 16 is connected to a control power supply transformer 80 (see also FIG. 1). Specifically, the power supply circuit 16 is connected to the control power supply transformer 80 via a connecting wire 92 that connects a terminal 96b of a terminal block 96 in the vibration sensing device 10 to a terminal 90b of a terminal block 90 in the control device 30. The power supply circuit 16 smoothes the line voltage of the S phase and the T phase of the electric circuit 52 and converts it into a DC voltage. The power supply circuit 16 is also connected to a power failure detection circuit 2 and a trip circuit 26. When a power failure occurs in the electric circuit 52, the power failure detection circuit 2 stops supplying power from the power supply circuit 16 and outputs a power failure detection signal to the operation delay timer circuit 4. That is, the vibration detection signal from the vibration detection circuit 12 and the power failure detection signal from the power failure detection circuit 2 are input to the operation delay timer circuit 4. The DC voltage converted by the power supply circuit 16 is also supplied to circuits other than the power failure detection circuit 2 in the vibration sensing device 10.

[0036] The trip circuit 26 is connected to a normally open contact 28. The normally open contact 28 is also connected to a terminal 96c of a terminal block 96 provided in the vibration sensing device 10. As described above, the terminal 90c of the terminal block 90 is connected to the terminal 96c of the terminal block 96 by the wiring 98. Therefore, the normally open contact 28 can be considered to be connected to the terminal 90c of the terminal block 90 provided in the control device 30.

[0037] The operation delay timer circuit 4 delays the vibration detection signal and the power failure detection signal and outputs a signal (trip operation permission signal) to the normally open contact 28. Specifically, the operation delay timer circuit 4 outputs a signal to the normally open contact 28 when both the vibration detection signal and the power failure detection signal are continuously input for a predetermined time (e.g., 2 seconds). That is, the operation delay timer circuit 4 does not output a signal to the normally open contact 28 if the input signal from the vibration detection circuit 12 or the power failure detection circuit 34 is less than the predetermined time. When the operation delay timer circuit 4 outputs a signal to the normally open contact 28, an excitation coil (not shown) is excited and the normally open contact 28 closes. When the normally open contact 28 closes, power is supplied to the trip coil 56 from the power supply circuit 16 via the trip circuit 26, terminal 96c of the terminal block 96, connecting wire 98, and terminal 90c of the terminal block 90. ​​The predetermined time of the operation delay timer circuit 4 is arbitrary and may be, for example, 1 second, 3 seconds, or 5 seconds. After a signal is output to the normally open contact 28, the operation delay timer circuit 4 returns to its initial state.

[0038] The vibration detection test circuit 6 can input a test signal to the vibration detection circuit 12. That is, the vibration detection test circuit 6 can input a pseudo signal for confirming vibration detection to the vibration detection circuit 12. Furthermore, by providing the vibration detection test circuit 6, it is possible to check whether or not the vibration sensing device 10 is malfunctioning during periodic inspection of the control device 10.

[0039] Since the vibration sensing device 10 can be easily connected to an existing control device 30 via a connecting wire, it is also possible to convert an already installed high-voltage air switch (a high-voltage air switch without a vibration sensing function) into a high-voltage air switch that can respond to disasters such as earthquakes.

[0040] (Operation of high-voltage air contactor 100) The operation of the high-voltage air contactor 100 will be described below. First, a case where a ground fault occurs in the electric circuit 52 will be described. When a ground fault occurs in the electric circuit 52, a ground fault detection signal is input from the ground fault detection circuit 31 to the operation determination circuit 32. As described above, the operation determination circuit 32 determines whether or not a lock signal is input from the lock circuit 38. When an overcurrent detection signal is input from the overcurrent detection circuit 36, the lock circuit 38 outputs a lock signal to the operation determination circuit 32. In other words, when an overcurrent detection signal is not input from the overcurrent detection circuit 36, the lock circuit 38 does not output a lock signal to the operation determination circuit 32. Therefore, when a current equal to or greater than the overcurrent detection threshold does not flow in the electric circuit 52, the operation determination circuit 32 outputs a trip operation permission signal to the OR circuit 39, and the OR circuit 39 outputs a trip operation request signal to the operation output circuit 40, causing the normally open contacts 41 to close and the trip coil 56 to perform a trip operation of the switching unit 54.

[0041] On the other hand, when a current equal to or greater than the overcurrent detection threshold flows in the electric circuit 52 (the overcurrent detection circuit 36 ​​outputs an abnormality detection signal to the lock circuit 38), a lock signal is output from the lock circuit 38 to the operation determination circuit 32, and therefore the tripping operation of the switching unit 54 is locked (the tripping operation is set to a preparation state). When a power outage occurs in the electric circuit 52, the power outage detection circuit 34 outputs a power outage detection signal to the AND circuit 37, and then the switching unit 54 performs a tripping operation. This prevents the switching unit 54 from being opened while an overcurrent is flowing in the electric circuit 52, and makes it possible to prevent a failure of the high-voltage air contactor 100 (switch body 50).

[0042] Next, we will explain what happens when an overcurrent fault occurs in the electric circuit 52 and causes a power outage in the electric circuit 52. When an overcurrent fault occurs in the electric circuit 52, the overcurrent detection circuit 36 ​​outputs an abnormality detection signal to the AND circuit 37 and the lock circuit 38. Therefore, when a current equal to or greater than the overcurrent detection threshold flows through the electric circuit 52, the lock circuit 38 outputs a lock signal to the operation determination circuit 32, and the trip operation of the switching unit 54 is locked. When a power outage occurs in the electric circuit 52, the power outage detection circuit 34 outputs a power outage detection signal to the AND circuit 37. When the abnormality detection signal from the current detection unit 60 and the power outage detection signal from the power outage detection circuit 34 are input to the AND circuit 37, the AND circuit 37 outputs a trip operation permission signal to the OR circuit 39. As a result, the OR circuit 39 outputs a trip operation request signal to the operation output circuit 40, the normally open contact 41 closes, and the trip coil 56 trips the switching unit 54. The switching unit 54 is prevented from being opened when an overcurrent is flowing through the electric circuit 52, and breakdown of the high voltage air switch 100 (switch body 50) can be prevented.

[0043] Next, we will explain what happens when a power outage occurs in the electric circuit 52 and the vibration detection circuit 12 (vibration sensor 14) detects vibrations of a predetermined value or greater. This situation can typically occur when a power outage occurs due to an earthquake. When the vibration detection circuit 12 detects vibrations of a predetermined value or greater, a vibration detection signal is input to the operation delay timer circuit 4. Furthermore, when the power outage detection circuit 2 detects a power outage in the electric circuit 52, a power outage detection signal is output to the operation delay timer circuit 4.

[0044] When both the vibration detection signal and the power outage detection signal are input continuously for a predetermined time, the operation delay timer circuit 4 outputs a signal to the normally open contact 28. As a result, power is supplied to the trip coil 56 from the terminal 96c of the terminal block 96 via the connecting wire 98 and the terminal 90c of the terminal block 90, and the trip coil 56 trips the switching unit 54. In other words, when a power outage occurs in the electric circuit 52 due to the occurrence of an earthquake, the switching unit 54 is opened. As a result, power is prevented from being supplied to the load equipment when power is restored to the power system, and the occurrence of secondary disasters such as fires can be prevented.

[0045] On the other hand, if the voltage of the electric circuit 52 only drops temporarily, no signal is input from the operation delay timer circuit 4 to the normally open contacts 28, and no tripping operation is performed by the switching unit 54. Therefore, the high-voltage air switchgear 100 can prevent the switching unit 54 from performing a tripping operation when an extremely short-term power outage (instantaneous voltage drop) that is not generally called a power outage occurs and vibration that is not a disaster such as an earthquake is detected simultaneously. The high-voltage air switchgear 100 can prevent a malfunction such as the switching unit 54 performing a tripping operation when it is not necessary to do so.

[0046] Furthermore, in the high-voltage air switch 100, when a power outage and vibration occur, the switching unit 54 can be tripped without using the circuits (overcurrent detection circuit 36, lock circuit 38, operation output circuit 40, etc.) within the control device 30. In other words, the specifications of the vibration sensor 14 (vibration detection circuit 12) can be designed independently from the specifications of the circuits within the control device 30.

[0047] (Modification of the first embodiment (high-voltage air contactor 100)) The high voltage air contactors 100a to 100d will be described below with reference to Figures 3 to 6. The high voltage air contactors 100a to 100d are modified examples of the high voltage air contactor 100. The high voltage air contactors 100a to 100d differ from the vibration sensing device 10 of the high voltage air contactor 100 in the structure of the vibration sensing devices 10a to 10d. For the high voltage air contactors 100a to 100d, only the structure of the vibration sensing devices 10a to 10d will be described. Furthermore, for the vibration sensing devices 10a to 10d, the same reference numbers as those used for the vibration sensing device 10 will be used to designate the same configurations as those of the vibration sensing device 10, and descriptions thereof may be omitted.

[0048] As shown in FIG. 3, the vibration sensing device 10a of the high-voltage air switchgear 100a is provided with a trip circuit 26, a normally open contact 28, a power supply circuit 16, a power outage detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, a power outage continuation confirmation circuit 20, and an AND circuit 22. A power outage detection signal is input from the power outage detection circuit 2. The power outage continuation confirmation circuit 20 delays the power outage detection signal and outputs it to the AND circuit 22. Specifically, the power outage continuation confirmation circuit 20 outputs the power outage detection signal to the AND circuit 22 when the power outage detection signal has been input continuously for a predetermined time (e.g., 2 seconds). The predetermined time for the power outage continuation confirmation circuit 20 to detect the power outage detection signal is arbitrary and may be, for example, 1 second, 3 seconds, or 5 seconds.

[0049] The AND circuit 22 also receives as input a vibration detection signal from the vibration detection circuit 12. When both the power outage detection signal from the power outage continuation confirmation circuit 20 and the vibration detection signal from the vibration detection circuit 12 are input to the AND circuit 22, the AND circuit 22 outputs a signal to the normally open contact 28. In other words, if the power outage detection signal input from the power outage detection circuit 20 to the power outage continuation confirmation circuit 20 is for less than a predetermined time, no signal is output from the AND circuit 22 to the normally open contact 28, and no tripping operation is performed by the switching unit 54. The high-voltage air contactor 100a can also prevent malfunctions such as the switching unit 54 performing a tripping operation when it is not necessary.

[0050] As shown in FIG. 4, the vibration sensing device 10b of the high-voltage air switchgear 100b includes a trip circuit 26, normally-open contacts 28, a power supply circuit 16, a power outage detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, an AND circuit 22, and a signal output circuit 24. The AND circuit 22 receives a power outage detection signal from the power outage detection circuit 2 and a vibration detection signal from the vibration detection circuit 12. When both the power outage detection signal and the vibration detection signal are input, the AND circuit 22 outputs a signal to the signal output circuit 24. The signal output circuit 24 delays the signal from the AND circuit 22 and outputs the signal to the normally-open contacts 28. Specifically, the signal output circuit 24 outputs a signal to the normally-open contacts 28 when the signal from the AND circuit 22 is continuously input for a predetermined time (e.g., 2 seconds). The predetermined time for the signal output circuit 24 to detect the signal from the AND circuit 22 is arbitrary and may be, for example, 1 second, 3 seconds, or 5 seconds.

[0051] In the high voltage air switch 100b, if the power failure detection signal input from the power failure detection circuit 2 to the AND circuit 22 is for less than a predetermined time, no signal is output from the signal output circuit 24 to the normally open contact 28. Therefore, the high voltage air switch 100b can also prevent a malfunction such as a tripping operation being performed when a tripping operation of the switching unit 54 is not required.

[0052] As shown in FIG. 5, the vibration sensing device 10c of the high-voltage air switchgear 100c is provided with a trip circuit 26, normally open contacts 28, a power supply circuit 16, a power outage detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, an operation delay timer circuit 4, and a signal output circuit 24. The vibration sensing device 10c can also be considered to have a structure in which the output signal of the operation delay timer circuit 4 of the vibration sensing device 10 is input to the signal output circuit 24 (see also FIG. 2). In the high-voltage air switchgear 100c, the power outage detection signal from the power outage detection circuit 2 is delayed by the operation delay timer circuit 4, and further, the output signal of the operation delay timer circuit 4 is delayed by the signal output circuit 24. Therefore, the high-voltage air switchgear 100c can more reliably prevent malfunctions such as tripping of the switching unit 54 when it is not necessary.

[0053] As shown in FIG. 6, the vibration sensing device 10d of the high-voltage air switchgear 100d is provided with a trip circuit 26, normally open contacts 28, a power supply circuit 16, a power outage detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, a power outage continuation confirmation circuit 20, an AND circuit 22, and a signal output circuit 24. The vibration sensing device 10d can also be considered to have a structure in which the output signal of the AND circuit 22 of the vibration sensing device 10a is input to the signal output circuit 24 (see also FIG. 3). Alternatively, the vibration sensing device 10d can also be considered to have a structure in which the power outage detection signal from the power outage detection circuit 2 is input to the AND circuit 22 via the power outage continuation confirmation circuit 20 (see also FIG. 4). In the high-voltage air switchgear 100d, the power outage detection signal from the power outage detection circuit 2 is delayed by the power outage continuation confirmation circuit 20, and the output signal of the AND circuit 22 is further delayed by the signal output circuit 24. Therefore, the high voltage air contactor 100d can also more reliably prevent a malfunction such as the switching unit 54 performing a tripping operation when the tripping operation is not required.

[0054] (Another modified example of the high-voltage air switch of the first embodiment (modified example 1-1)) Although not shown in the figures, the high voltage air switchgear of Modification 1-1 is the same as the high voltage air switchgears 100, 100a, 100b, 100c, and 100d described above, except that the zero-phase-sequence current transformer 58 is omitted from the switchgear main body 50 (see FIG. 1), and the ground fault detection circuit 31, operation determination circuit 32, lock circuit 38, and OR circuit 39 are omitted from the control device 30 (see FIGS. 2 to 6). In other words, the high voltage air switchgear of Modification 1-1 is a high voltage air switchgear (switchgear main body and control device) that has only an overcurrent protection function (SO function) and does not have a ground fault function (GR function), and to which any of the vibration sensors 10, 10a, 10b, 10c, and 10d is connected. Note that the vibration sensor 10, 10a, 10b, 10c, or 10d may be disposed within the control device 30. This type of high-voltage air switch can also prevent the problem of tripping the switching unit 54 when it is not necessary.

[0055] (Another modified example of the high-voltage air switch of the first embodiment (modified example 1-2)) Although not shown, the high voltage air switchgear of Modification 1-2 is configured by omitting the current detection unit 60 from the switchgear main body 50 of the above-mentioned high voltage air switchgears 100, 100a, 100b, 100c, and 100d, omitting the overcurrent detection circuit 36, AND circuit 37, lock circuit 38, and operation determination circuit 32 from the control device 30, and connecting the connecting wire 98 to a terminal 90d of a terminal block 90 in the control device 30 (see FIGS. 1 to 6). That is, the high voltage air switchgear of Modification 1-2 is configured by connecting any one of the vibration sensors 10, 10a, 10b, 10c, and 10d to a high voltage air switchgear (switchgear main body and control device) having only a ground fault function (GR function) and no overcurrent protection function (SO function). The vibration sensor 10, 10a, 10b, 10c, or 10d may be disposed in the control device 30. This type of high-voltage air switch can also prevent the problem of tripping the switching unit 54 when it is not necessary.

[0056] (Second Example) An overview of the high voltage air switch 200 will be described with reference to Fig. 7. The high voltage air switch 200 is a modified example of the high voltage air switch 100. Therefore, for the high voltage air switch 200, the same configurations as those of the high voltage air switch 100 will be given the same reference numbers as those given to the high voltage air switch 100, and descriptions thereof may be omitted.

[0057] 7, the high voltage air switch 200 includes a switch body 50, a control device 230 that controls the operation of the switch body 50, and a vibration sensing device 10. The structure of the switch body 50 is the same as that of the switch 50 of the high voltage air switch 100.

[0058] The control device 230 and the vibration sensing device 10 will be described with reference to FIG. 8. A terminal block 90 is provided in the control device 230, and an input terminal 90e is provided in the terminal block 90 for inputting an output signal of the vibration sensing device 10. The basic structure of the control device 230 is the same as that of the control device 30 (see FIG. 2). The action delay timer circuit 4 in the vibration sensing device 10 is connected to the input terminal 90e via a terminal 96e of a terminal block 96 and a wiring 95. The input terminal 90e is also connected to a path from the overcurrent detection circuit 36 ​​to the action output circuit 40 by a wiring (not shown) or the like. In other words, the input terminal 90e is connected to a portion that can trip the action output circuit 40. For example, the input terminal 90e is connected to any one of the overcurrent detection circuit 36, the AND circuit 37, the OR circuit 39, and the operation output circuit 40, or to the path from the overcurrent detection circuit 36 ​​to the lock circuit 38 or the AND circuit 37, the path from the AND circuit 37 to the OR circuit 39, or the path from the OR circuit 39 to the operation output circuit 40.

[0059] The vibration sensing device 10 of the high-voltage air switch 200 has the same structure as the vibration sensing device 10 of the high-voltage air switch 100, except that it does not have a trip circuit 26 and normally open contacts 28. In the high-voltage air switch 200, the output signal of the action delay timer circuit 4 is input to the input terminal 90e via a terminal 96e of a terminal block 96 and a wiring 95. Therefore, when the vibration detection circuit 12 detects vibration of a predetermined value or more and the power failure detection circuit 2 detects a power failure in the electric circuit 52 that continues for a predetermined time, an output signal from the action delay timer circuit 4 is input to the input terminal 90e. When the output signal of the action delay timer circuit 4 is input to the input terminal 90e, the power failure detection circuit 2 is connected via the input terminal 96e to a part that can trip the above-mentioned action output circuit 40, so that a trip action permission signal is output from the action output circuit 40, the normally open contacts 41 close, and the trip coil 56 performs a trip operation on the switching unit 54.

[0060] On the other hand, if the voltage of the electric circuit 52 only temporarily drops, no signal is input from the operation delay timer circuit 4 to the input terminal 90e, and the switching unit 54 does not perform a trip operation. Therefore, even in the high-voltage air switch 200, if an extremely short-term power outage (instantaneous voltage drop) not generally referred to as a power outage occurs and vibration that is not a disaster such as an earthquake occurs simultaneously, the switching unit 54 can be prevented from performing a trip operation. The high-voltage air switch 200 generates trip operation permission signals associated with vibration and power outages outside the control device 230 (inside the vibration sensing device 10), so adjustment of whether or not to perform trip operations associated with vibration and power outages can be made independently of the configuration within the control device 230. Furthermore, since power is supplied to the trip coil 56 using the normally open contact 41, the structure within the vibration sensing device 10 can be simplified compared to the high-voltage air switch 100 (the trip circuit 26 and normally open contact 28 within the vibration sensing device 10 can be omitted).

[0061] (Modification of the second embodiment (high-voltage air contactor 200)) Below, the high voltage air circuit breakers 200a to 200d will be described with reference to Figures 9 to 12. The high voltage air circuit breakers 200a to 200d are modified examples of the high voltage air circuit breaker 200. The high voltage air circuit breakers 200a to 200d differ from the vibration sensing device 10 of the high voltage air circuit breaker 200 in the structure of the vibration sensing devices 10a to 10d. For the high voltage air circuit breakers 200a to 100d, only the structure of the vibration sensing devices 10a to 10d will be described. Furthermore, for the vibration sensing devices 10a to 10d, the same reference numbers as those used for the vibration sensing device 10 will be used to designate the same configurations as those for the vibration sensing device 10, and descriptions thereof may be omitted.

[0062] As shown in FIG. 9, the vibration sensing device 10a of the high-voltage air switchgear 200a is provided with a power supply circuit 16, a power outage detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, a power outage continuation confirmation circuit 20, and an AND circuit 22. A power outage detection signal is input from the power outage detection circuit 2. The power outage continuation confirmation circuit 20 delays the power outage detection signal and outputs it to the AND circuit 22. Specifically, the power outage continuation confirmation circuit 20 outputs the power outage detection signal to the AND circuit 22 when the power outage detection signal has been input continuously for a predetermined time (e.g., 2 seconds). The predetermined time for the power outage continuation confirmation circuit 20 to detect the power outage detection signal is arbitrary and may be, for example, 1 second, 3 seconds, or 5 seconds.

[0063] The AND circuit 22 also receives as input a vibration detection signal from the vibration detection circuit 12. When both the power outage detection signal from the power outage continuation confirmation circuit 20 and the vibration detection signal from the vibration detection circuit 12 are input to the AND circuit 22, the AND circuit 22 outputs a signal to the input terminal 90e. In other words, if the power outage detection signal input from the power outage detection circuit 20 to the power outage continuation confirmation circuit 20 is less than a predetermined time, no signal is output from the AND circuit 22 to the input terminal 90e, and no tripping operation is performed on the switching unit 54. The high-voltage air contactor 200a can also prevent malfunctions such as the switching unit 54 performing a tripping operation when it is not necessary.

[0064] As shown in FIG. 10, the vibration sensing device 10b of the high-voltage air switch 200b includes a power supply circuit 16, a power outage detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, an AND circuit 22, and a signal output circuit 24. The AND circuit 22 receives a power outage detection signal from the power outage detection circuit 2 and a vibration detection signal from the vibration detection circuit 12. When both the power outage detection signal and the vibration detection signal are received, the AND circuit 22 outputs a signal to the signal output circuit 24. The signal output circuit 24 delays the signal from the AND circuit 22 and outputs the delayed signal to the input terminal 90e. Specifically, the signal output circuit 24 outputs a signal to the input terminal 90e when the signal from the AND circuit 22 is continuously received for a predetermined time (e.g., two seconds). The predetermined time for the signal output circuit 24 to detect the signal from the AND circuit 22 is arbitrary and may be, for example, one second, three seconds, or five seconds.

[0065] In the high voltage air switch 200b, if the power failure detection signal input from the power failure detection circuit 2 to the AND circuit 22 is for less than a predetermined time, no signal is output from the signal output circuit 24 to the input terminal 90e. Therefore, the high voltage air switch 200b can also prevent a malfunction such as a tripping operation being performed when a tripping operation of the switching unit 54 is not required.

[0066] As shown in FIG. 11, the vibration sensing device 10c of the high-voltage air switchgear 200c is provided with a power supply circuit 16, a power outage detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, an operation delay timer circuit 4, and a signal output circuit 24. The vibration sensing device 10c can also be considered to have a structure in which the output signal of the operation delay timer circuit 4 of the vibration sensing device 10 is input to the signal output circuit 24 (see also FIG. 7). In the high-voltage air switchgear 200c, the operation delay timer circuit 4 delays the power outage detection signal from the power outage detection circuit 2, and further, the signal output circuit 24 delays the output signal of the operation delay timer circuit 4. Therefore, the high-voltage air switchgear 200c can more reliably prevent malfunctions such as the switching unit 54 performing a tripping operation when it is not necessary.

[0067] As shown in FIG. 12, the vibration sensing device 10d of the high-voltage air switchgear 200d is provided with a power supply circuit 16, a power outage detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, a power outage continuation confirmation circuit 20, an AND circuit 22, and a signal output circuit 24. The vibration sensing device 10d can also be considered to have a structure in which the output signal of the AND circuit 22 of the vibration sensing device 10a is input to the signal output circuit 24 (see also FIG. 9). Alternatively, the vibration sensing device 10d can also be considered to have a structure in which the power outage detection signal from the power outage detection circuit 2 is input to the AND circuit 22 via the power outage continuation confirmation circuit 20 (see also FIG. 10). In the high-voltage air switchgear 200d, the power outage detection signal from the power outage detection circuit 2 is delayed by the power outage continuation confirmation circuit 20, and the output signal of the AND circuit 22 is further delayed by the signal output circuit 24. Therefore, the high voltage air contactor 200d can also more reliably prevent a malfunction such as the switching unit 54 performing a tripping operation when the tripping operation is not required.

[0068] (Another modified example of the high-voltage air switch of the second embodiment (modified example 2-1)) Although not shown, the high voltage air switchgear of Modification 2-1 is obtained by omitting the zero-phase-sequence current transformer 58 from the switchgear main body 50 (see FIG. 7) and omitting the ground fault detection circuit 31, operation determination circuit 32, lock circuit 38, and OR circuit 39 from the control device 230 (see FIGS. 8 to 12) in the above-mentioned high voltage air switchgears 200, 200a, 200b, 200c, and 200d. In other words, the high voltage air switchgear of Modification 2-1 is obtained by connecting any one of the vibration sensors 10, 10a, 10b, 10c, and 10d to a high voltage air switchgear (switchgear main body and control device) that has only an overcurrent protection function (SO function) and does not have a ground fault function (GR function). The vibration sensor 10, 10a, 10b, 10c, or 10d may be disposed within the control device 230. This type of high-voltage air switch can also prevent the problem of tripping the switching unit 54 when it is not necessary.

[0069] (Another modified example of the high-voltage air switch of the second embodiment (modified example 2-2)) Although not shown, the high voltage air switch of Modification 2-2 is configured by omitting the current detection unit 60 from the switch body 50 of the above-mentioned high voltage air switch 200, 200a, 200b, 200c, and 200d, omitting the overcurrent detection circuit 36, AND circuit 37, lock circuit 38, and operation determination circuit 32 from the control device 230, and connecting the connecting wire 98 to a terminal 90d of a terminal block 90 in the control device 30 (see FIGS. 8 to 12). That is, the high voltage air switch of Modification 2-2 is configured by connecting any one of the vibration sensors 10, 10a, 10b, 10c, and 10d to a high voltage air switch (switch body and control device) having only a ground fault function (GR function) and no overcurrent protection function (SO function). The vibration sensor 10, 10a, 10b, 10c, or 10d may be arranged in the control device 230. This type of high-voltage air switch can also prevent the problem of tripping the switching unit 54 when it is not necessary.

[0070] (Other variations) Instead of an overcurrent lock type (SOG type) high-voltage air circuit breaker (see Figures 1 and 7), any of the vibration sensors 10, 10a, 10b, 10c, and 10d may be connected to an overcurrent energy storage trip with earth fault energy storage trip type (SOSG type) high-voltage air circuit breaker. Also, the vibration sensors 10, 10a, 10b, 10c, and 10d may be equipped with a lighting lamp that lights up when vibration is detected.

[0071] Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. Furthermore, the technical elements described in this specification or drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technology exemplified in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives itself has technical utility. [Explanation of symbols]

[0072] 2: Power outage detection circuit 10: Vibration sensing device 14: Vibration detection circuit 30: Control device 32: Operation judgment circuit 34: Power outage detection means 37: AND circuit 39: OR circuit 54:Electric circuit 56: Trip operation means 60: Overcurrent detection means 100: Switch

Claims

1. A vibration sensing device connected to a switch having overcurrent detection means for detecting an overcurrent fault in an electric circuit, power failure detection means connected to two phases of the electric circuit and detecting a power failure in the electric circuit, and tripping operation means for automatically opening the electric circuit, and attached to a control device for controlling the operation of the switch, the device detects vibrations and trips the tripping operation means when a power failure in the electric circuit is detected continuously for a predetermined period of time, a power outage detection circuit to which an output signal of the power outage detection means is input; a vibration detection circuit for detecting vibration; a trip circuit that causes the trip operation means to perform a trip operation; an operation delay means for receiving output signals from the power failure detection means and the vibration detection circuit; a normally open contact that operates in response to an output from the operation delay means; an input terminal for inputting a trip operation signal from the vibration sensor is provided between the normally open contact for automatically opening the electric circuit and the trip operation means in the control device; A vibration sensing device that causes tripping means to perform a tripping operation when a tripping operation signal is input from the vibration sensing device to an input terminal.

2. A vibration sensing device connected to a switch having overcurrent detection means for detecting overcurrent faults in an electric circuit, earth fault detection means for detecting earth faults in the electric circuit, power failure detection means connected to two phases of the electric circuit and detecting power failures in the electric circuit, and trip operation means for automatically opening the electric circuit, and attached to a control device for controlling the operation of the switch, the device detects vibrations and trips the trip operation means when it detects a power failure in the electric circuit for a predetermined continuous period of time, a power outage detection circuit to which an output signal of the power outage detection means is input; a vibration detection circuit for detecting vibration; a trip circuit that causes the trip operation means to perform a trip operation; an operation delay means for receiving output signals from the power failure detection means and the vibration detection circuit; a normally open contact that operates in response to an output from the operation delay means; an input terminal for inputting a trip operation signal from the vibration sensor is provided between the normally open contact for automatically opening the electric circuit and the trip operation means in the control device; A vibration sensing device that causes tripping means to perform a tripping operation when a tripping operation signal is input from the vibration sensing device to an input terminal.

3. A vibration sensing device is connected to a switch having a ground fault detection means for detecting a ground fault in an electric circuit, a power failure detection means connected to two phases of the electric circuit and detecting a power failure in the electric circuit, and a trip operation means for automatically opening the electric circuit, and is attached to a control device that controls the operation of the switch, and detects vibrations and causes the trip operation means to perform a trip operation when a power failure in the electric circuit is detected continuously for a predetermined period of time, a power outage detection circuit to which a signal indicating a power outage in the electrical circuit is input; a vibration detection circuit for detecting vibration; a trip circuit that causes the trip operation means to perform a trip operation; an operation delay means for receiving output signals from the power failure detection means and the vibration detection circuit; a normally open contact that operates in response to an output from the operation delay means; an input terminal for inputting a trip operation signal from the vibration sensor is provided between the normally open contact for automatically opening the electric circuit and the trip operation means in the control device; A vibration sensing device that causes tripping means to perform a tripping operation when a tripping operation signal is input from the vibration sensing device to an input terminal.

4. A switch comprising: overcurrent detection means for detecting an overcurrent fault in an electric circuit; power failure detection means connected to two phases of the electric circuit and detecting a power failure in the electric circuit; tripping means for automatically opening the electric circuit; a control device; and a vibration sensing device provided with vibration detection means for detecting vibrations, The vibration sensing device includes a vibration detection circuit to which an output signal of the vibration detection means is input, a power failure detection circuit to which an output signal of the power failure detection means is input, a trip circuit that causes the trip operation means to perform a trip operation, an operation delay means that receives the output signals of the power failure detection means and the vibration detection circuit when the vibration detection circuit detects vibration and the power failure detection circuit detects a power failure in the electric circuit for a predetermined continuous time, and outputs a trip operation signal, and a normally open contact that operates by the output from the operation delay means. an input terminal for inputting a trip operation signal from the vibration sensor is provided between the normally open contact for automatically opening the electric circuit and the trip operation means in the control device; A switch that causes tripping means to perform a tripping operation when a tripping operation signal is directly input to an input terminal from an operation delay means of a vibration sensing device.

5. A switch comprising: a ground fault detection means for detecting a ground fault in an electric circuit; a vibration sensing means for detecting vibration; a tripping operation means for automatically opening the electric circuit; a control device; and a vibration sensing device provided with the vibration sensing means for detecting vibration, The vibration sensing device includes a vibration detection circuit to which an output signal from the vibration detection means is input, a power outage detection circuit to which a signal indicating a power outage is input, a trip circuit that causes the trip operation means to perform a trip operation, an operation delay means that receives the output signals from the power outage detection means and the vibration detection circuit and outputs a trip operation signal when the vibration detection circuit detects vibration and the power outage detection circuit detects a power outage in the electric circuit for a predetermined continuous time, and a normally open contact that operates by the output from the operation delay means. an input terminal for inputting a trip operation signal from the vibration sensor is provided between the normally open contact for automatically opening the electric circuit and the trip operation means in the control device; A switch that causes tripping means to perform a tripping operation when a tripping operation signal is directly input to an input terminal from an operation delay means of a vibration sensing device.

6. A switch comprising: overcurrent detection means for detecting an overcurrent fault in an electric circuit; power failure detection means connected to two phases of the electric circuit and detecting a power failure in the electric circuit; tripping means for automatically opening the electric circuit; vibration sensing means for detecting vibration; and a control device, The switch further includes a power outage detection circuit to which an output signal from the power outage detection means is input, a vibration detection circuit to detect vibration from the vibration sensing means, and an operation delay means for receiving the output signals from the power outage detection means and the vibration sensing means and outputting a trip operation signal when the vibration detection circuit detects vibration and the power outage detection circuit detects a power outage in the electric circuit for a predetermined period of time, and a vibration sensing device provided with a normally open contact that operates according to the output from the operation delay means. an input terminal for inputting a trip operation signal from the vibration sensor is provided between the normally open contact for automatically opening the electric circuit and the trip operation means in the control device; A switch that causes tripping means to perform a tripping operation when a tripping operation signal is directly input to an input terminal from an operation delay means of a vibration sensing device.

7. 7. The switch according to claim 4, wherein the control device further comprises a ground fault detection means for detecting a ground fault in the electric line.

8. 7. A switch according to claim 6, wherein when a tripping operation signal is input to the input terminal from the vibration sensing device, the tripping operation means is made to perform a tripping operation using a detection signal from the overcurrent detection means and a detection signal from the power failure detection means.

9. A switch comprising: a ground fault detection means for detecting a ground fault in an electric circuit; a vibration sensing means for detecting vibration; a trip operation means for automatically opening the electric circuit; and a control device, The switch further includes a power failure detection means for detecting a power failure in the electric circuit, a power failure detection circuit to which an output signal of the power failure detection means is input, a vibration detection circuit for detecting vibration of the vibration detection means, an operation delay means for receiving the output signals of the power failure detection means and the vibration detection means and outputting a trip operation signal when the vibration detection circuit detects vibration and the power failure detection circuit detects a power failure in the electric circuit for a predetermined period of time, and a vibration detection device provided with a normally open contact that operates by the output from the operation delay means. an input terminal for inputting a trip operation signal from the vibration sensor is provided between the normally open contact for automatically opening the electric circuit and the trip operation means in the control device; A switch that causes tripping means to perform a tripping operation when a tripping operation signal is directly input to an input terminal from an operation delay means of a vibration sensing device.

Images