JP2023036438A - Vibration sensing device - Google Patents

Abstract

To provide a vibration sensing device which can suppress the malfunction of a switch.SOLUTION: A vibration sensing device is attached to a switch which 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; and a control device. The vibration sensing device includes: a power failure detection circuit to which an output signal of the power failure detection means is input; and a vibration detection circuit which detects vibration. When the vibration detection circuit detects vibration and the power failure detection circuit continues to detect the power failure of the electric path for a predetermined time, the vibration sensing device outputs a signal to an overcurrent detection circuit in the control device. When the overcurrent detection means detects the overcurrent accident of the electric path, the control device makes a switch body in a trip operation ready state. The control device controls to perform the trip operation of the switch body when the power failure of the electric path is detected by the power failure detection means in addition to the detection of an overcurrent accident by the overcurrent detection means, or when the power failure of the electric path is detected by the power failure detection means while a signal is output from the vibration sensing device to the overcurrent detection circuit.SELECTED DRAWING: Figure 2

Description

This specification discloses a technique related to a vibration sensing device attached to a switch that opens and closes an electric circuit.

In Patent Document 1, when a power outage occurs due to a disaster such as an earthquake, it is possible to prevent the occurrence of a secondary disaster such as a fire caused by energizing the electrical equipment of the power consumer after the power supply is restarted. A possible switch is disclosed. The switch of Patent Document 1 does not trip (do not open) the switch when an overcurrent accident occurs in the electric circuit, and sets the trip state to the preparation state. Then, when a power failure is detected by the power failure detection means, or when vibration is detected by the vibration detection means and power failure is detected by the power failure detection means, the switch is tripped (opened). That is, the switch of Patent Document 1 does not perform a tripping operation only when vibration is detected by the vibration sensing means, but performs a tripping operation when a power failure is detected along with the detection of vibration. This prevents the switch from tripping (malfunctioning) when vibrations that are not disasters such as earthquakes are detected, such as when a large vehicle passes around the switch and causes vibration. can do.

JP 2007-273389 A

The switch of Patent Literature 1 performs a trip operation when both power failure and vibration are detected. As a result, malfunction (erroneous opening) of the switch is suppressed. However, when the voltage of the electric circuit accidentally drops temporarily at the same time as the vibration is detected, the switch of Patent Document 1 may determine that the power failure has been detected together with the vibration, and may perform a trip operation. . The temporary voltage drop in the electric circuit means that the voltage is approximately 90% or less of the normal voltage for approximately 2 seconds or less, and is sometimes called "instantaneous drop". That is, the switch of Patent Document 1 has a special state in which an extremely short-time power failure (instantaneous voltage drop), which is not generally called a power failure, occurs accidentally, and vibration that is not a disaster such as an earthquake occurs. When this occurs, a malfunction such as executing a trip operation may occur even though the trip operation is unnecessary. Therefore, there is a demand for a vibration sensing device capable of suppressing malfunction of the switch. An object of the present specification is to provide a vibration sensing device capable of suppressing malfunction of a switch.

One form of the vibration sensing device disclosed in this specification is attached to a switch provided with overcurrent detection means for detecting an overcurrent accident in an electric circuit, power failure detection means for detecting a power failure in the electric circuit, and a control device. The vibration sensing device may include a power failure detection circuit to which the output signal of the power failure detection means is input, and a vibration detection circuit for detecting vibration. Further, the vibration sensing device may output a signal to the overcurrent detection circuit in the control device when the vibration detection circuit detects vibration and the power failure detection circuit detects power failure of the electric circuit for a predetermined period of time. By attaching this vibration sensing device to the switch, the control device prepares the trip operation of the switch main body when the overcurrent detection means detects an overcurrent accident in the electric circuit, and the overcurrent accident is detected by the overcurrent detection means. When a power outage in the electric circuit is detected by the power outage detection means along with the detection of, or when a signal is output from the vibration sensing device to the overcurrent detection circuit and a power outage in the electric circuit is detected by the power outage detection means The trip can be operated.

Another form of the vibration sensing device disclosed in this specification includes overcurrent detection means for detecting an overcurrent accident in the electric circuit, ground fault detection means for detecting a ground fault in the electric circuit, and blackout detection means for detecting a power failure in the electric circuit. It is attached to the switch with the detection means and the control device. The vibration sensing device may include a power failure detection circuit to which the output signal of the power failure detection means is input, and a vibration detection circuit for detecting vibration. Further, the vibration sensing device may output a signal to the overcurrent detection circuit in the control device when the vibration detection circuit detects vibration and the power failure detection circuit detects power failure of the electric circuit for a predetermined period of time. By attaching this vibration sensing device to the switch, the control device prepares the trip operation of the switch main body when the overcurrent detection means detects an overcurrent accident in the electric circuit, and performs the following (1) to (3). In either case, the switch body can be tripped. (1) When an overcurrent accident is detected by the overcurrent detection means and a power failure of the electric circuit is detected by the power failure detection means. (2) When the ground fault is detected by the ground fault detection means and the overcurrent fault is not detected by the overcurrent detection means. (3) When a signal is output from the vibration sensing device to the overcurrent detection circuit and a power failure of the electric circuit is detected by the power failure detection means.

Still another form of the vibration sensing device disclosed in this specification is attached to a switch comprising ground fault detection means for detecting a ground fault in an electric circuit, vibration sensing means for detecting vibration, and a control device. The vibration sensing device may include a power failure detection circuit that receives a signal indicating that a power failure has occurred in the electric circuit, and a vibration detection circuit that detects vibration. By attaching this vibration sensing device to the switch, the control device detects when a ground fault accident is detected by the ground fault detection means, or when vibration is detected by the vibration sensing device and power failure of the electric circuit is detected by the power failure detection means. When the detection continues for a predetermined time, the switch main body can be tripped.

1 shows a schematic diagram of a switch; FIG. 1 shows a block diagram of a vibration sensing device of a first embodiment; FIG. FIG. 4 shows a block diagram of a vibration sensing device of a second embodiment; FIG. 11 shows a block diagram of a vibration sensing device of a third embodiment; FIG. 11 shows a block diagram of a vibration sensing device of a fourth embodiment; FIG. 11 shows a block diagram of a vibration sensing device of a fifth embodiment;

The vibration sensing device disclosed herein may include a power failure detection circuit, a vibration detection circuit, a circuit (or a group of circuits) to which output signals of the power failure detection circuit and the vibration detection circuit are input. The power failure detection circuit may be connected to the control power transformer of the switch. By connecting the power failure detection circuit to the control power transformer of the switch, the power failure detection circuit can detect the power failure in the power circuit when the power failure occurs in the power circuit. The output section of the circuit to which the output signals of the power failure detection circuit and the vibration detection circuit are input may be connected to an overcurrent detection circuit within the control device. In addition, the circuit to which the output signal of the power failure detection circuit and the vibration detection circuit is input delays the output signal of the power failure detection circuit (when the output signal of the power failure detection circuit continues to be input for a predetermined time) to prevent overcurrent. A signal may be output to the detection circuit.

As a circuit (circuit group) that delays the output signal of the power failure detection circuit and outputs the signal to the overcurrent detection circuit, there is an operation delay timer circuit that outputs a signal when the signal is continuously input for a predetermined time. Alternatively, in addition to the operation delay timer circuit, a signal output circuit that outputs a signal when the output signal of the operation delay timer circuit is continuously input for a predetermined time may be provided. In addition, as a circuit (circuit group) that delays the output signal of the power failure detection circuit and outputs a signal to the overcurrent detection circuit, it is a power failure continuation confirmation circuit when the output signal of the power failure detection circuit continues to be input for a predetermined time. , and an AND circuit to which the output signal of the power failure continuation confirmation circuit and the output signal of the vibration detection circuit are input. Alternatively, in addition to the power failure continuation confirmation circuit and the AND circuit, a signal output circuit that outputs a signal when the output signal of the AND circuit is continuously input for a predetermined time may be provided. Also, as a circuit (circuit group) that delays the output signal of the power failure detection circuit and outputs a signal to the overcurrent detection circuit, an AND circuit to which the output signal of the power failure detection circuit and the output signal of the vibration detection circuit are input, and an AND circuit A combination of signal output circuits that output a signal when the output signal of the circuit is continuously input for a predetermined time can be used.

When the vibration sensing device is attached to the switch, the switch prepares the trip operation of the switch main body when the overcurrent detection means detects an overcurrent accident in the electric circuit, and closes the electric circuit. Then, when the overcurrent accident is detected and the power failure of the electric circuit is detected by the power failure detection means, the trip operation of the switch main body is executed. Further, when vibration is detected by the vibration sensing means and power failure of the electric circuit is detected by the power failure detection circuit for a predetermined period of time, the switch main body is tripped. That is, when the vibration sensing device is attached to the switch, even if the vibration detection circuit detects vibration, if the power failure detection circuit does not detect a power failure in the electric circuit for a predetermined period of time, the switch body trips. Take no action. As a result, it is possible to prevent the trip operation from being performed when the voltage of the electric circuit is temporarily lowered (so-called momentary voltage drop). The vibration sensing device disclosed in this specification can suppress the malfunction that the switch performs the trip operation when the electric circuit experiences an instantaneous voltage drop (when the trip operation is unnecessary).

The outline of the high pressure air switch 100 will be described with reference to FIG. The high pressure air switch 100 is an example of a switch, and is an overcurrent lock type (SOG type) high pressure air switch. The high pressure air switch 100 includes a switch body 50 , a control device 30 that controls the operation of the switch body 50 , and a vibration sensing device 10 . The switch main body 50 and the control device 30 are connected by a cable. The switch main body 50 is installed above a utility pole (not shown), and the control device 30 is installed below the utility pole. Vibration sensing device 10 is connected to controller 30 by wires 92 and 94 . More specifically, the vibration sensing device 10 is connected to the output of a control power transformer 80 and the input of the overcurrent detection circuit 36, which will be described later. First, the configuration inside the switch main body 50 will be described.

(Structure of switch body)
The switch main body 50 is provided on the electric line 52 . More specifically, the switch main body 50 is connected to a power supply side (power source side) electric line 52a and a consumer side (load side) electric line 52b to electrically connect them (the electric line 52 is closed). ing). The electric circuit 52 has an R phase, an S phase and a T phase. A zero-phase current transformer 58, a switch section 54, a control power supply transformer 80, and a current detection section 60 are arranged in this order on the electric line 52 from the power supply side to the load side.

A zero-phase current transformer 58 detects a zero-phase current (ground fault current) generated in the electric circuit 52 . Both ends of the zero-phase current transformer 58 are connected to the controller 30 . Although details will be described later, both ends of the zero-phase current transformer 58 are connected to terminals 90d of a terminal block 90 provided in the control device 30, and connected to the ground fault detection circuit 31 (see FIG. 2). there is When a zero-phase current is detected by zero-phase current transformer 58, a detection signal is output to control device 30 (ground fault detection circuit 31).

The opening/closing unit 54 includes switches 54r, 54s and 54t. The switches 54r, 54s and 54t are provided on the R phase, S phase and T phase of the electric circuit 52, respectively. When the opening/closing part 54 is opened, the electric line 52 is opened, and when the opening/closing part 54 is closed, the electric line 52 is closed.

The control power supply transformer 80 has two coils with different numbers of turns. It is connected to a terminal 90b of a terminal block 90 provided inside the device 30, and is connected to the power supply circuit 33 and the accumulator 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 inside the vibration sensing device 10, and is connected to the power supply circuit 16 (see FIG. 2). That is, the secondary coil is also connected to the power supply circuit 16 within the vibration sensing device 10 . The control power transformer 80 can generate power to drive the circuits in the control device 30 . The high pressure air switch 100 can secure power to drive circuits in the control device 30 and the vibration sensing device 10 by using the voltage of the electric circuit 52, so that the control device 30 and the vibration sensing device 10 It is possible to omit providing a separate power source only for driving the circuit of .

The current detector 60 includes current transformers 60r and 60t. As described above, the current detection unit 60 is provided downstream of the opening/closing unit 54 (on the side of the consumer side electric line 52b). Therefore, the current transformers 60r and 60t can detect load currents flowing through the R-phase and T-phase of the electric circuit 52, respectively. The current detector 60 is connected to the microswitch 70 . The microswitch 70 is of the double-throw type and has a normally closed contact 72, a normally open contact 74 and a common contact 76. As shown in FIG.
The normally closed contact 72 and the common contact 76 are connected to a 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). A wiring 94 is also connected to the terminal 90a. The wiring 94 is connected to a terminal 96a of a terminal block 96 provided inside the vibration sensing device 10, and is connected to the operation delay timer circuit 4 (see FIG. 2). That is, the current detector 60 is also connected to the operation delay timer circuit 4 within the vibration sensing device 10 .

The microswitch 70 connects the normally closed contact 72 and the common contact 76 (the normally closed contact 72 is ). When the normally closed contact 72 and the common contact 76 are connected, a detection signal is output to the control device 30 . Also, the normally closed contact 72 is connected to the trip coil 56 . The trip coil 56 is connected to a terminal 90c of a terminal block 90 provided inside the control device 30, and is 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 section 54 .

The control device 30 will be described with reference to FIG. A plurality of circuits and normally open contacts 41 are provided in the controller 30 . The ground fault detection circuit 31 is connected to the zero-phase current transformer 58 via the terminal 90d of the terminal block 90 (see also FIG. 1), and grounds when the output signal from the zero-phase current transformer 58 is detected. A fault detection signal is output to the operation determination circuit 32 .

The power supply circuit 33 is connected to the control power transformer 80 via the 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 to obtain a DC voltage. Convert to The power supply circuit 33 is also connected to a power failure detection circuit 34 . Therefore, when the electric circuit 52 loses power, the power failure detection circuit 34 can determine that the power supply from the power supply circuit 33 is stopped and that the electric circuit 52 is out of power. The power failure detection circuit 34 outputs a power failure detection signal to the AND circuit 37 when it determines that the electric circuit 52 has failed. Although not shown, the DC voltage converted by the power supply circuit 33 is also supplied to circuits other than the power failure detection circuit 34 within the control device 30 .

The accumulator circuit 35 is also connected to the control power transformer 80 via a terminal 90b of the terminal block 90. As shown in FIG. The accumulator circuit 35 stores the line-to-line voltage of 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 accumulator circuit 35 and the trip coil 56 . When the normally open contact 41 is closed, the electric power stored in the accumulator circuit 35 is supplied to the trip coil 56 , and the trip coil 56 is energized to trip the switching section 54 .

The overcurrent detection circuit 36 is connected to the current detection section 60 via the terminal 90a of the terminal block 90 (see also FIG. 1), and detects an abnormality when an overcurrent detection signal is input from the current detection section 60. A signal is output to the AND circuit 37 and the lock circuit 38 . An output signal of the operation delay circuit 4 in the vibration sensing device 10 is also input to the overcurrent detection circuit 36 . The lock circuit 38 outputs a lock signal to the operation determination circuit 32 when the abnormality detection signal is input, and locks the trip operation of the opening/closing portion 54 . That is, when the lock signal is input to the lock circuit 38, the opening operation of the opening/closing portion 54 is prohibited.

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

The AND circuit 37 outputs a trip operation permission signal to the OR circuit 39 when both the power failure detection signal from the power failure detection circuit 34 and the abnormality detection signal from the overcurrent detection circuit 36 are input. That is, the AND circuit 37 does not output the trip operation permission signal to the OR circuit 39 when 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 is input. The OR circuit 39 outputs a trip operation request signal to the operation output circuit 40 when the trip operation permission signal from the operation determination circuit 32 or the trip operation permission signal from the AND circuit 37 is input. The OR circuit 39 outputs the trip operation request signal to the operation output circuit 40 even when the trip operation permission signal is input from both the operation determination circuit 32 and the AND circuit 37 .

The operation output circuit 40 excites an exciting coil (not shown) to close the normally open contact 41 when a trip operation request signal is input from the OR circuit 39 . As a result, power is supplied from the accumulator circuit 35 to the trip coil 56 through the terminal 90c of the terminal block 90, and the opening/closing portion 54 is tripped.

(Structure of vibration sensing device: first embodiment)
The vibration sensing device 10 is provided with a power supply circuit 16 , a power failure 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 . The vibration sensor 14 outputs a detection signal to the vibration detection circuit 12 when detecting a vibration equal to or greater than a predetermined value. The vibration sensor 14 is adjusted to output a detection signal when vibration corresponding to a seismic intensity of 5 is detected, for example. The vibration sensing device 10 can be installed at the bottom of a utility pole like the control device 30 . Note that the vibration sensing device 10 can be installed at any position above, below, left, or right with respect to the control device 30 .

The vibration detection circuit 12 outputs a vibration detection signal to the reset timer circuit 8 and the operation delay timer circuit 4 when the detection signal from the vibration sensor 14 is input. 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 after a predetermined time (for example, 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 of the reset timer circuit 8 is arbitrary, and may be, for example, 1 minute, 10 minutes, or 1 hour.

The power supply circuit 16 is connected to a control power transformer 80 (see also FIG. 1). Specifically, the power supply circuit 16 is connected to the control power transformer 80 by a connection wire 92 that connects the terminal 96b of the terminal block 96 in the vibration sensing device 10 and the terminal 90b of the terminal block 90 in the control device 30. It is The power supply circuit 16 smoothes the S-phase and T-phase line voltages of the electric circuit 52 and converts them into DC voltages. Also, the power supply circuit 16 is connected to the power failure detection circuit 2 . The power failure detection circuit 2 stops the power supply from the power supply circuit 16 and outputs a power failure detection signal to the operation delay timer circuit 4 when the electric circuit 52 has a power failure. That is, the operation delay timer circuit 4 receives the vibration detection signal from the vibration detection circuit 12 and the power failure detection signal from the power failure detection circuit 2 . The DC voltage converted by the power supply circuit 16 is also supplied to circuits other than the power failure detection circuit 2 within the vibration sensing device 10 .

The operation delay timer circuit 4 is connected to the overcurrent detection circuit 36 . Specifically, the operation delay timer circuit 4 is connected to the overcurrent detection circuit 36 by a connection wire 94 that connects the terminal 96a of the terminal block 96 in the vibration sensing device 10 and the terminal 90a of the terminal block 90 in the control device 30. It is connected. The operation delay timer circuit 4 delays the vibration detection signal and the power failure detection signal and outputs the signals to the overcurrent detection circuit 36 . Specifically, the operation delay timer circuit 4 outputs a signal to the overcurrent detection circuit 36 when both the vibration detection signal and the power failure detection signal are continuously input for a predetermined time (for example, two seconds). That is, the operation delay timer circuit 4 does not output a signal to the overcurrent detection circuit 36 when the input signal from the vibration detection circuit 12 or the power failure detection circuit 34 is less than the predetermined time. The predetermined time of the operation delay timer circuit 4 is arbitrary, and may be, for example, 1 second, 3 seconds, or 5 seconds. Also, the operation delay timer circuit 4 returns to the initial state after the signal is output from the overcurrent detection circuit 36 to the AND circuit 37 and the lock circuit 38 .

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 confirmation of vibration detection to the vibration detection circuit 12 . Further, by providing the vibration detection test circuit 6, it is possible to check whether or not the vibration sensing device 10 is faulty during the periodical inspection of the control device 10. FIG.

Since the vibration sensing device 10 can be easily connected to the existing control device 30 through a connection wire, the already installed high pressure air switch (high pressure switch without vibration sensing function) can be used. , a high-pressure air switch capable of coping with disasters such as earthquakes.

(Operation of high pressure air switch)
The operation of the high pressure air switch 100 will be described below. First, a case where a ground fault occurs in the electric line 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 the lock signal is input from the lock circuit 38 . The lock circuit 38 outputs a lock signal to the operation determination circuit 32 when the overcurrent detection signal from the overcurrent detection circuit 36 is input. In other words, the lock circuit 38 does not output the lock signal to the operation determination circuit 32 when the overcurrent detection signal from the overcurrent detection circuit 36 is not input. Therefore, when a current exceeding the overcurrent detection threshold does not flow through the electric circuit 52, the trip operation permission signal is output from the operation determination circuit 32 to the OR circuit 39, and the trip operation request signal is output from the OR circuit 39 to the operation output circuit 40. When the signal is output, the normally open contact 41 is closed and the trip coil 56 trips the opening/closing portion 54 .

On the other hand, when a current exceeding the overcurrent detection threshold is flowing through the electric circuit 52 (an abnormality detection signal is output from the overcurrent detection circuit 36 to the lock circuit 38), the lock circuit 38 sends a lock signal to the operation determination circuit 32. is output, the tripping operation of the opening/closing unit 54 is locked (the tripping operation is put into a ready state). When a power failure occurs in the electric circuit 52, after a power failure detection signal is output from the power failure detection circuit 34 to the AND circuit 37, the opening/closing unit 54 is tripped. As a result, it is possible to prevent the switching portion 54 from being opened while an overcurrent is flowing through the electric circuit 52, thereby preventing failure of the high pressure air switch 100 (switch body 50).

Next, a case where an overcurrent accident occurs in the electric line 52 and the electric line 52 is cut off will be described. When an overcurrent accident occurs in the electric circuit 52 , an abnormality detection signal is output from the overcurrent detection circuit 36 to the AND circuit 37 and the lock circuit 38 . Therefore, when a current greater than or equal to the overcurrent detection threshold is flowing through the electric path 52, a lock signal is output from the lock circuit 38 to the operation determination circuit 32, and the tripping operation of the opening/closing portion 54 is locked. When a power failure occurs in the electric circuit 52 , a power failure detection signal is output from the power failure detection circuit 34 to the AND circuit 37 . When the abnormality detection signal from the current detection unit 60 and the power failure detection signal from the power failure 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, a trip operation request signal is output from the OR circuit 39 to the operation output circuit 40 , the normally open contact 41 is closed, and the trip coil 56 performs the trip operation of the opening/closing portion 54 . The switching portion 54 is prevented from being opened while an overcurrent is flowing through the electric circuit 52, and failure of the high pressure air switch 100 (switch body 50) can be prevented.

Next, a case where a power failure occurs in the electric circuit 52 and the vibration detection circuit 12 (vibration sensor 14) detects vibration equal to or greater than a predetermined value will be described. Such a situation typically occurs when a power outage occurs following the occurrence of an earthquake. When the power failure detection circuit 2 detects a power failure of the electric circuit 52 , a power failure detection signal is output to the operation delay timer circuit 4 . Further, when the power failure detection circuit 2 detects the power failure of the electric circuit 52 , the power failure detection circuit 34 in the control device 30 also detects the power failure of the electric circuit 52 . Therefore, when a power failure occurs in the electric circuit 52 , a power failure detection signal is output to the AND circuit 37 and the operation delay timer circuit 4 .

The operation delay timer circuit 4 detects overcurrent through the terminal 96a of the terminal block 96, the connection wire 94 and the terminal 90a of the terminal block 90 when both the vibration detection signal and the power failure detection signal are continuously input for a predetermined time. A signal is output to the detection circuit 36 . As described above, when a signal is input to the overcurrent detection circuit 36 , the overcurrent detection circuit 36 outputs signals to the AND circuit 37 and the lock circuit 38 . Therefore, when a signal is input from the operation delay timer circuit 4 to the overcurrent detection circuit 36 , both the power failure detection signal from the power failure detection circuit 34 and the output signal of the overcurrent detection circuit 36 are input to the AND circuit 37 . That is, both the power failure detection signal from the power failure detection circuit 34 and the signal from the operation delay timer circuit 4 are input to the AND circuit 37 only when the power failure detection circuit 2 continues to output the power failure detection signal for a predetermined time. In other words, when the electric circuit 52 experiences a temporary voltage drop (voltage drop for less than a predetermined period of time), the power failure detection signal is input from the power failure detection circuit 34 to the AND circuit 37, but the overcurrent detection circuit 36 (operation delay timer The signal from circuit 4) is not input to the AND circuit 37.

When both the power failure detection signal from the power failure detection circuit 34 and the signal from the operation delay timer circuit 4 are input to the AND circuit 37, the trip operation permission signal is output from the AND circuit 37 to the OR circuit 39. A trip operation request signal is output to the operation output circuit 40 , the normally open contact 41 is closed, and the trip coil 56 trips the opening/closing portion 54 . That is, when a power failure occurs in the electric line 52 due to the occurrence of an earthquake, the opening/closing portion 54 is opened. As a result, when the power system is restored, the load equipment is prevented from being energized, and the occurrence of a secondary disaster such as a fire can be prevented.

On the other hand, when the voltage of the electric circuit 52 only temporarily drops, the signal from the overcurrent detection circuit 36 (operation delay timer circuit 4) is not input to the AND circuit 37, and the opening/closing portion 54 does not trip. Therefore, in the high pressure air switch 100, when an extremely short-time power failure (instantaneous voltage drop), which is not generally called a power failure, occurs at the same time as a vibration that is not a disaster such as an earthquake, It is possible to prevent the part 54 from performing a trip operation. The switch 10 to which the vibration sensing device 10 is attached can prevent a malfunction such that the trip operation of the switch portion 54 is performed when the trip operation is unnecessary.

(Modified examples of vibration sensing device: second to fifth embodiments)
The high pressure air switches 100a to 100d will be described below with reference to FIGS. 3 to 6. FIG. The high pressure air switches 100a to 100d are modifications of the high pressure air switch 100. FIG. The high pressure air switches 100a to 100d are different from the vibration sensing device 10 attached to the high pressure air switch 100 in the structure of the attached vibration sensing devices 10a to 10d. As for the high-pressure air switches 100a-100d, only the structures of the vibration sensing devices 10a-10d will be described. Further, with respect to the vibration sensing devices 10a to 10d, the same reference numerals as those of the vibration sensing device 10 are assigned to the same configurations as the vibration sensing device 10, and description thereof may be omitted.

(Second embodiment)
As shown in FIG. 3, the vibration sensing device 10a of the high pressure air switch 100a includes a power supply circuit 16, a power failure detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, and a vibration detection test circuit 6. , a power failure continuation confirmation circuit 20 and an AND circuit 22 are provided. A power failure detection signal from the power failure detection circuit 2 is input to the power failure continuation confirmation circuit 20 . The power failure continuation confirmation circuit 20 delays the power failure detection signal and outputs it to the AND circuit 22 . Specifically, the power failure continuation confirmation circuit 20 outputs the power failure detection signal to the AND circuit 22 when the power failure detection signal continues to be input for a predetermined time (for example, two seconds). The predetermined time for the power failure continuation confirmation circuit 20 to detect the power failure detection signal is arbitrary, and may be, for example, 1 second, 3 seconds, or 5 seconds.

A vibration detection signal from the vibration detection circuit 12 is also input to the AND circuit 22 . When both the power failure detection signal from the power failure 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 overcurrent detection circuit 36 . That is, when the power failure detection signal input from the power failure detection circuit 2 to the power failure continuation confirmation circuit 20 is less than the predetermined time, the signal is not output from the AND circuit 22 to the overcurrent detection circuit 36, and the switching unit 54 does not trip. Not done. The high-pressure air switch 100a to which the vibration sensing device 10a is attached can also prevent the tripping operation of the opening/closing part 54 when it is unnecessary.

(Third embodiment)
As shown in FIG. 4, the vibration sensing device 10b of the high pressure air switch 100b includes a power supply circuit 16, a power failure detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, and a vibration detection test circuit 6. , an AND circuit 22 and a signal output circuit 24 are provided. A power failure detection signal from the power failure detection circuit 2 and a 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 overcurrent detection circuit 36 when both the power failure detection signal and the vibration detection signal are input. The signal output circuit 24 delays the signal of the AND circuit 22 and outputs the signal to the overcurrent detection circuit 36 . Specifically, the signal output circuit 24 outputs a signal to the overcurrent detection circuit 36 when the signal from the AND circuit 22 continues to be input for a predetermined time (for example, 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, 1 second, 3 seconds, or 5 seconds.

In the high pressure air switch 100b, when the power failure detection signal input from the power failure detection circuit 2 to the AND circuit 22 is less than the predetermined time, the signal output circuit 24 does not output the signal to the overcurrent detection circuit 36, and the AND circuit A signal from the overcurrent detection circuit 36 is not input to 37 . Therefore, the high-pressure air switch 100b can also prevent a problem that the tripping operation of the opening/closing part 54 is performed when the tripping operation is unnecessary.

(Fourth embodiment)
As shown in FIG. 5, the vibration sensing device 10c of the high pressure air switch 100c includes a power supply circuit 16, a power failure detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, and a vibration detection test circuit 6. , an operation delay timer circuit 4 and a signal output circuit 24 are provided. The vibration sensing device 10c can also be regarded as having 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-pressure air switch 100c, the operation delay timer circuit 4 delays the power failure detection signal from the power failure detection circuit 2, and the signal output circuit 24 delays the output signal of the operation delay timer circuit 4. Therefore, the high-pressure air switch 100c can more reliably prevent the malfunction that the trip operation of the opening/closing part 54 is performed when the trip operation is unnecessary.

(Fifth embodiment)
As shown in FIG. 6, the vibration sensing device 10d of the high pressure air switch 100d includes a power supply circuit 16, a power failure detection circuit 2, a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, and a vibration detection test circuit 6. , a power failure continuation confirmation circuit 20, an AND circuit 22 and a signal output circuit 24 are provided. The vibration sensing device 10d can also be regarded as having 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 be regarded as having a structure in which the power failure detection signal from the power failure detection circuit 2 is input to the AND circuit 22 via the power failure continuation confirmation circuit 20 (see also FIG. 4). . In the high pressure air switch 100d, the power failure detection signal from the power failure detection circuit 2 is delayed by the power failure continuation confirmation circuit 20, and the output signal of the AND circuit 22 is delayed by the signal output circuit 24. Therefore, the high-pressure air switch 100d can also more reliably prevent the malfunction that the trip operation of the opening/closing part 54 is performed when the trip operation is unnecessary.

(Modification 1 of high-pressure air switch)
Although illustration is omitted, the high-pressure air switch of Modification 1 is the above-described high-pressure air switch 100, 100a, 100b, 100c, and 100d, from the switch main body 50 (see FIG. 1) to the zero-phase current transformation. 58 is omitted, and the ground fault detection circuit 31, the operation determination circuit 32, the lock circuit 38 and the OR circuit 39 are omitted from the controller 30 (see FIGS. 2 to 6). In other words, the high pressure air switch of Modification 1 has only the overcurrent protection function (SO function) without the ground fault function (GR function), whereas the high pressure air switch (switch body and control device) has Any one of vibration sensing devices 10, 10a, 10b, 10c and 10d is connected. This type of high-pressure air switch can also prevent the malfunction that the tripping operation of the opening/closing part 54 is performed when it is unnecessary.

(Modification 2 of high-pressure air switch)
Although illustration is omitted, the high pressure air switch of Modification 2 is similar to the high pressure air switches 100, 100a, 100b, 100c, and 100d described above, except that the current detection unit 60 is omitted from the switch body 50, and the control device 30, the overcurrent detection circuit 36, the AND circuit 37, the lock circuit 38, and the operation determination circuit 32 are omitted, and the connection wire 94 is connected to the terminal 90d of the terminal block 90 in the control device 30 (FIGS. 1 to 4). 6). That is, the high-voltage air switch of Modification 2 has only the ground fault function (GR function) without the overcurrent protection function (SO function), whereas the high-pressure air switch (switch body and control device) has: Any one of vibration sensing devices 10, 10a, 10b, 10c and 10d is connected. This type of high-pressure air switch can also prevent the malfunction that the tripping operation of the opening/closing part 54 is performed when it is unnecessary.

(Other modifications)
In place of the overcurrent lock type (SOG type) high pressure air switch (see Fig. 1), vibration sensing is applied to the high voltage air switch of the ground fault accumulating trip type (SOSG type) with overcurrent accumulating trip. Any of the devices 10, 10a, 10b, 10c and 10d may be connected. Moreover, the vibration sensing devices 10, 10a, 10b, 10c, and 10d may include lighting lamps that are lit when vibration is detected.

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 changes of the specific examples illustrated above. In addition, the technical elements described in this specification or in the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques exemplified in this specification or drawings can simultaneously achieve a plurality of purposes, and achieving one of them has technical utility in itself.

2: Power failure detection circuit 10: Vibration sensor 14: Vibration detection circuit 30: Control device 34: Power failure detection means 54: Electric circuit 60: Overcurrent detection means 100: Switch

Claims (6)

A vibration sensing device attached to a switch, comprising overcurrent detection means for detecting an overcurrent accident in an electric circuit, power failure detection means for detecting a power failure in the electric circuit, and a control device,
Vibration sensing device
A power failure detection circuit to which the output signal of the power failure detection means is input, and a vibration detection circuit for detecting vibration,
When the vibration detection circuit detects vibration and the power failure detection circuit detects a power failure of the electric circuit for a predetermined time, a signal is output to the overcurrent detection circuit in the control device,
The controller is
When the overcurrent detection means detects an overcurrent accident in the electric circuit, the switch main body is set in a ready state for tripping,
When an overcurrent accident is detected by the overcurrent detection means and a power failure of the electric circuit is detected by the power failure detection means, or when a signal is output from the vibration sensor to the overcurrent detection circuit and the power failure of the electric circuit is detected by the power failure detection means. A vibration sensing device that trips the switch body when detected. Attached to a switch provided with overcurrent detection means for detecting overcurrent accidents in electric circuits, ground fault detection means for detecting ground fault accidents in electric circuits, power failure detection means for detecting power failures in electric circuits, and a control device A vibration sensing device,
Vibration sensing device
A power failure detection circuit to which the output signal of the power failure detection means is input, and a vibration detection circuit for detecting vibration,
When the vibration detection circuit detects vibration and the power failure detection circuit detects a power failure of the electric circuit for a predetermined time, a signal is output to the overcurrent detection circuit in the control device,
The controller is
When the overcurrent detection means detects an overcurrent accident in the electric circuit, the switch main body is set in a ready state for tripping,
A vibration sensing device that trips a switch body in any of the following cases (1) to (3).
(1) When the overcurrent detection means detects an overcurrent fault and the power failure detection means detects a power failure in the electric circuit (2) When the ground fault detection means detects the ground fault and the overcurrent detection means detects the overcurrent fault (3) When a signal is output from the vibration sensing device to the overcurrent detection circuit and a power failure of the electric circuit is detected by the power failure detection means A vibration sensing device to be attached to a switch, comprising ground fault detection means for detecting a ground fault in an electric circuit, vibration sensing means for detecting vibration, and a control device,
Vibration sensing device
A power failure detection circuit that receives a signal indicating that a power failure has occurred in the electric circuit, and a vibration detection circuit that detects vibration,
The controller is
When a ground fault is detected by the ground fault detection means, or when vibration is detected by the vibration sensor and a power failure of the electric circuit is detected by the power failure detection means for a predetermined period of time, the switch main body is tripped. Vibration sensing device. An operation delay means for receiving the output signals of the power failure detection circuit and the vibration detection circuit,
4. The operation delay means outputs a signal to the overcurrent detection circuit in the control device when both the output signal of the power failure detection circuit and the output signal of the vibration detection circuit are input for a predetermined time. 1. The vibration sensing device according to claim 1. An AND circuit that receives the output signals of the power failure detection circuit and the vibration detection circuit, and a power failure continuation confirmation means connected between the power failure detection circuit and the AND circuit,
The power failure continuation confirmation means outputs a signal to the AND circuit when the output signal of the power failure detection circuit continues to be input for a predetermined time,
4. The vibration sensing device according to any one of claims 1 to 3, wherein the AND circuit outputs a signal to the overcurrent detection circuit in the control device when signals are input from the power failure continuation confirmation means and the vibration detection circuit. . An AND circuit that receives the output signals of the power failure detection circuit and the vibration detection circuit, and a signal output means that receives the output signal of the AND circuit,
4. The vibration sensing device according to any one of claims 1 to 3, wherein the signal output means outputs a signal to the overcurrent detection circuit in the control device when the output signal of the AND circuit is continuously received for a predetermined time. .

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