JP2948106B2 - High-voltage load switch-on alarm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm device for preventing a spill accident to an electric power company when a high-voltage load switch is opened and then closed again.

[0002]

2. Description of the Related Art Conventionally, a high-voltage load switch has been installed on the first power receiving pillar of a private electric facility in case of an accident affecting a power company (transmitting side) due to an accident of a customer's electric equipment (power receiving side). However, this is prevented by opening this switch. FIG. 4 shows a single-line diagram of the private electric equipment provided with the high-voltage load switch. The high-voltage load switch 101 is controlled by a switch control circuit 102 that opens the high-voltage load switch 101 in the event of a ground fault or an overcurrent fault. The power is supplied from a secondary side of a transformer 105 provided on the load side of the switch 101 via a circuit breaker 106.

When the switch control circuit 102 operates to open the high-voltage load switch 101 due to a ground fault or an overcurrent fault, the cause of the fault is clarified and appropriate measures are taken for the fault. It is necessary to turn on various circuit breakers in order from the one closer to. For example, first, the wiring breaker 106 is turned on, then the cutout switch 104 provided on the primary side of the transformer 105 is turned on, and the cutout switch 104 is provided between the high-voltage load switch 101 and the cutout switch 104. The vacuum circuit breaker 103 is turned on, and finally the high-voltage load switch 10
Input 1. Thus, when the high-voltage load switch 101 is turned on again after the high-voltage load switch 101 is opened, the power supply to the switch control circuit 102 is changed to the vacuum circuit breaker 10.
3. The power is supplied through the cut-out switch 104 and the transformer 105, and the high-voltage load switch 101 is controlled by the switch control circuit 102. Therefore, it is possible to avoid a spillover accident to the power company.

[0004]

However, in the above conventional example, when the high-voltage load switch 101 is turned on in a state where all the circuit breakers have not been turned on, the switch control circuit 102 Since the power is not supplied, the control operation cannot be performed, and if the high-voltage load switch 101 does not shift to the open state, a spillover accident to the power company may occur. Further, even when the high-voltage load switch 101 is turned on while the treatment of the accident is inadequate or the cause is unknown, the power may not be supplied to the switch control circuit 102. is there.

[0005] Generally, in order to prevent a mistake in closing of various circuit breakers, a closing procedure manual describing an accident treatment is prepared and thoroughly known, but when an accident occurs and a power failure occurs, It is difficult to completely prevent human error, because the consciousness of recovery is early and the procedure is not always followed. Therefore, there is an unsolved problem in the closing operation of the high-voltage load switch that it is necessary to surely prevent various closing mistakes and to prevent the occurrence of a ripple accident.

[0006] In view of the above, an object of the present invention is to solve the above-mentioned unsolved problem, to prevent a re-input error of various circuit breakers at the time of a ground fault and an overcurrent accident, and to provide a power company. It is an object of the present invention to provide a high-voltage load switch-on alarm device that can avoid a spillover accident.

[0007]

According to a first aspect of the present invention, there is provided a high-voltage load switch-on alarm device, comprising: a high-voltage load switch interposed between a power transmission side and a power reception side; Switch control means that operates with the operation power supplied from the power supply and opens the high-voltage load switch when a ground fault or overcurrent is detected on the load side of the high-voltage load switch, and an auxiliary power supply that is independent of the operation power supply Alarm means for issuing an alarm based on the operation of the switch control means when the high-voltage load switch is opened, wherein the alarm means is operated on the power receiving side.
After the closing operation of the breaker inserted in the power supply system is completed, an alarm
It is characterized in that it can be released .

A high-voltage load switch-on alarm device according to a second aspect of the present invention operates with a high-voltage load switch interposed between a power transmission side and a power reception side and an operation power supply supplied from the power reception side. A switch control means for opening the high-voltage load switch when a ground fault or an overcurrent is detected on the load side of the switch, and a circuit breaker inserted in the operation power supply system on the power receiving side,
Alarm means operating with an auxiliary power supply independent of the operation power supply, wherein the alarm means includes an opening operation detecting means for detecting an opening operation of the switch control means, and a circuit breaker for detecting closing of the circuit breaker Having a closing detection means, to start an alarm when the opening operation is detected by the opening operation detecting means, and to activate an alarm when the circuit breaker closing detection is detected by the circuit breaker closing detecting means. It is characterized in that it can be stopped.

Further, a high-voltage load switch-on alarm device according to a third aspect is set when the alarm means detects an opening operation by the opening operation detecting means, and is activated by the circuit-breaker input detecting means. A relay that is reset when an alarm release switch is operated in a state where the alarm is detected, and an alarm that is activated by the auxiliary power supply when the relay is set and is deactivated when reset. Features.

[0010] In a fourth aspect of the present invention, the relay has a mechanical holding mechanism for the relay contact. The high-voltage load switch-on alarm device according to claim 5 is characterized in that the auxiliary power supply has a storage battery. Further, a high-voltage load switch-on alarm device according to claim 6 is characterized in that the alarm means is installed near the high-voltage load switch.

[0011]

According to the first aspect of the present invention, when an accident such as a ground fault or an overcurrent occurs, the high-voltage load switch is opened by the switch control means and an alarm is issued by the auxiliary power supply based on the operation of the switch control means. The means is activated and an alarm is issued, for example, by a buzzer or an indicator light. In addition, ground fault and overcurrent
By re-closing the circuit breaker that was shut down when the accident occurred.
Alarm means can be released, and after the breaker closing operation
The alarm is automatically released or the circuit breaker is turned on
Further operation of the alarm release switch after operation
Releases the alarm.

Further, according to the second aspect of the present invention, when the high-voltage load switch is opened due to a ground fault and an overcurrent, the opening operation of the switch control means is detected by the opening operation detecting means, whereby an alarm is issued. Start operation, and detect that the interrupted circuit breaker has been turned on again by circuit breaker closing detection means,
Thereby, the operation of the alarm can be stopped.

According to the third aspect of the present invention, the alarm means includes a relay and an alarm, and the relay is set when an opening operation is detected by the opening operation detecting means, and an alarm such as a buzzer is activated. Then, when the alarm release switch is operated in a state where the breaker closing detection means detects the breaker closing, the relay is reset and the alarm device is deactivated. According to the invention of claim 4 , since the relay has a mechanical holding mechanism for the relay contact, an exciting current is supplied to the relay when the relay contact is closed or opened, and the state of the relay contact thereafter becomes mechanical. Held by the mechanical mechanism.

According to the fifth aspect of the present invention, at the time of a power failure due to a ground fault and an overcurrent, the high-voltage load switch-on warning device is operated by the storage battery. According to the sixth aspect of the present invention, the warning means is installed near the high-voltage load switch, and the canceling operation of the warning means is prompted before the high-voltage load switch is turned on.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a single-line diagram of a private electric facility provided with a high-voltage load switch-on alarm device according to the present invention.
As shown in the figure, a high-voltage load switch 1 for inputting power from a transmission line DL on a power transmission side is installed on a first power receiving column of a private electric work on a power receiving side. A ground fault trip type (SOG) control circuit 2 with overcurrent accumulating trip as a controller control means is connected.
When a ground fault or an overcurrent fault occurs in an electric circuit connected to the output side of the high-voltage load switch 1 by the control circuit 2, the high-voltage load switch 1
Is controlled to be open. The output power of the high-voltage load switch 1 is supplied into a cubicle (high-voltage power receiving equipment) 11, a circuit breaker (CB) 3 that cuts off an electric circuit when an overcurrent occurs, a current transformer 4 that detects an overcurrent flowing in the electric circuit, and a step-down converter The power is transmitted to the distribution stations 6a and 6b and the indoor substation 7 via the transformer 5.

A part of the secondary side output of the transformer 31 provided in the indoor substation 7 is returned to the cubicle 11,
The power is supplied to the auxiliary power supply 8 serving as the power supply of the high-voltage load switch-on alarm device, and the voltage of the secondary output of the transformer 31 is supplied to the SOG control circuit 2 via the circuit breaker (MCCB) 9.
Are supplied as power for operation. Here, the SOG control circuit 2 immediately opens the high-voltage load switch 1 in the event of a ground fault, temporarily holds the closed circuit of the high-voltage load switch 1 in the case of an overcurrent accident, and operates the circuit breaker 3 to operate the high-voltage load switch 1 thereafter. After the interruption of the electric circuit and the power failure, the high-voltage load switch 1 is automatically opened due to the no-voltage state of the power supply to the SOG control circuit 2, and when the overcurrent and the ground fault accident overlap, It operates with priority given to current fault operation. Also, this SOG
The control circuit 2 is provided with an SO switch 2a and a GR switch 2b, which are operated in conjunction with the opening operation of the SOG control circuit 2 and have a contact that closes momentarily, as an opening operation detecting means, and are connected in parallel. The switch 2a operates when an overcurrent occurs, and the GR switch 2b operates when a ground fault occurs.

The output of the auxiliary power supply 8 is supplied to the alarm circuit 10 as an alarm start signal via the SO switch 2a and the GR switch 2b, and a CB interlocking switch connected in series as circuit breaker closing detection means. The alarm signal is supplied to the alarm circuit 10 as an alarm release permission signal via the 3a and the MCCB interlocking switch 9a. Here, the CB interlocking switch 3a is a switch that interlocks with the closing by the closing operation of the circuit breaker 3, and the MCCB interlocking switch 9a is a switch that closes the respective contacts thereof in conjunction with the closing by the closing operation of the MCCB9.

As shown in FIG. 2, the auxiliary power supply 8 includes a rectifier 8a for converting a low-voltage AC voltage input from a transformer 31 to a DC voltage, and a lead storage battery or an alkaline storage battery charged with the output voltage of the rectifier 8a. The output terminal tp is derived from the connection point between the positive output side of the rectifier 8a and the positive electrode side of the storage battery 8b, and from the connection point between the negative output side of the rectifier 8a and the negative electrode side of the storage battery 8b. Output terminal tn
Is derived. The storage battery 8b is charged during normal operation and serves as a power source for a high-voltage load switch-on alarm device during a power failure. Here, the storage battery 8b has a capacity capable of continuously operating a buzzer 10b and an indicator light 10h described later for 48 hours or more.

As shown in FIG. 2, the alarm circuit 10 has a positive terminal ts1 and a negative terminal th1 respectively connected to the output terminals tp and tn of the auxiliary power supply 8, and between the positive terminal ts1 and the negative terminal th1. The relay 1 has a relay contact K1 and a buzzer 10b connected in series, and a relay contact K2 and an indicator light 10h connected in series, which are connected in parallel.
A set terminal 10s of the relay 10a is connected to a start signal terminal ts to which an alarm start signal is input from the SOG control circuit 2, and a reset terminal 10r of the relay 10a is connected to one end of an alarm release switch PB for giving an alarm release signal to the relay 10a. The other end is connected to a release signal terminal tk to which an alarm release permission signal is supplied, and the common terminal 10c of the relay 10a.
Are connected to the negative electrode terminal th1. In addition, since the relay contact of the relay 10a is held by the mechanical holding mechanism, the contact between the relay contacts K1 and K2 is held after the operation by the exciting current even if there is no exciting current.

One end of an SO switch 2a and one end of a GR switch 2b, which are configured in parallel, are connected to the start signal terminal ts, and the other end is connected to a terminal ts2 (ts3) having the same voltage level as the positive terminal ts1. I have. Further, one end of the MCCB interlock switch 9a and the CB interlock switch 3a connected in series is connected to the release signal terminal tk, and the other end is connected to the terminal ts4 having the same voltage level as the positive terminal ts1.
It is connected to the.

FIG. 3 is a schematic configuration diagram of the high-voltage load switch-on alarm device 1 connected as described above. The high voltage load switch 1, the SOG control circuit 2, and the alarm circuit 10 are installed on the first power receiving column 33, respectively.
An auxiliary power supply 8 having a storage battery 8b;
CB interlock switch 3a attached to CCB9
And an interlocking switch 9a for MCCB.

In the single-line diagram of FIG. 1, the following various devices are connected in addition to the above-described devices. That is,
An instrument transformer for power supply and demand (PCT) 12 is provided between the high-voltage load switch 1 and the circuit breaker 3, and the PCT 12 includes various instruments such as a receiving voltmeter, a power factor meter, a wattmeter, and an ammeter. Is connected and measurement is performed. The lightning arrester 1 is connected to the electric circuit between the PCT 12 and the circuit breaker 3 through the disconnector 13.
4 is connected, and an instrument transformer 16 is connected via a fuse 15. On the output side of the circuit breaker 3, a current transformer 4 for detecting an overcurrent flowing in the circuit is provided, and the current transformer 4 includes an overcurrent relay (OCR) for opening the circuit breaker 3 based on the detection of the overcurrent. ) 18 is connected and O
Various measuring instruments are connected between the CR 18 and the instrument transformer 16. A grounding capacitor 21 for detecting zero-phase voltage for ground fault protection is connected to the secondary side of the step-down transformer 5 through a high-voltage cutout 20.
Are supplied to the distribution stations 6a and 6b and the indoor substation 7.

Each distribution station 6a, 6b has a circuit breaker 2
5, a current transformer 26 for detecting an overcurrent flowing in the electric circuit at the output of the circuit breaker 25, an overcurrent relay 27 operated by the current transformer 26 to open the circuit breaker 25, and a ground of the circuit path. A ground fault relay 28 for detecting a fault current and opening the circuit breaker 25 is also provided. In the indoor substation 7,
A high-voltage cutout 29 that protects the power supplied from the cubicle 11 against overcurrent and a high-voltage AC load switch 30 with a fuse that also protects the overcurrent are provided. The low voltage power is input to the primary side of the transformer 31 and output from the secondary side. The supplied power is input to the primary side of the transformer 32 through the high-voltage AC load switch 30, and the low-voltage power is output from the secondary side. Further, the secondary side of the transformer 31 is connected to the auxiliary power supply 8 in the cubicle 11 as described above. Further, a voltmeter and an ammeter are arranged on the secondary side of each of the transformers 31 and 32, and an operation status is checked.

Next, the operation of this embodiment will be described. A case of a ground fault and a case of an overcurrent fault will be described with reference to FIG. First, in the case of a ground fault, the SOG control circuit 2
As a result, the high-voltage load switch 1 is instantaneously opened, and the contact of the GR switch 2b that is linked with the operation of the SOG control circuit 2 is closed. Thereby, the set terminal 10s of the relay 10a
And the exciting current flows through the setting coil of the relay 10a, the relay contacts K1 and K2 are closed, the buzzer 10b emits an alarm sound, and the display lamp 10
h lights to indicate that an accident has occurred. At this time, the relay contact K is operated by the mechanical holding mechanism of the relay 10a.
1 and K2 remain closed.

To release the alarm circuit 10, the cause of the accident is clarified and measures are taken, and then the circuit breaker 3 and the MCC
B9 is closed by an artificial operation. Thereby, C
Interlocking switch 3a for B and interlocking switch 9a for MCCB
Is closed, and the alarm release switch PB of the alarm circuit 10 installed on the telephone pole together with the high-voltage load switch 1 is operated. As a result, a current is supplied to the reset terminal 10r of the relay 10a, an exciting current flows through the reset coil, the relay contacts K1 and K2 are opened, the opened state is held by the mechanical holding mechanism, the alarm sound is stopped, and the indicator light is turned on. Turns off.
Then, after the alarm circuit 10 is released, the high-voltage load switch 1 installed near the alarm circuit 10 is turned on, so that the operation power supply of the SOG control circuit 2 is switched to the circuit breaker 3 and the MC.
CB9, and the high-voltage load switch 1
The state is controlled by the control circuit 2. As a result, even if the output of the high-voltage load switch 1 is in a ground fault state, the SOG
The control by the control circuit 2 is performed, thereby avoiding a ripple accident to the power company.

Incidentally, when the CB interlock switch 3a and / or the MCCB interlock switch 9a are not closed, when the high voltage load switch 1 is turned on, the operating power is not supplied to the SOG control circuit 2 and the high voltage load switch 1 is in the control state. If the high-voltage load switch 1 is turned on in a state in which the ground fault accident is not sufficiently treated, there is a possibility that the accident may spread to a power company.

In the case of an overcurrent accident, the power supply to the MCCB 9 is cut off by opening the circuit breaker 3, and the high voltage load switch 1 is opened by the SOG control circuit 2 in a no-voltage state. At this time, the contact of the SO switch 2a, which is linked with the operation of the SOG control circuit 2, is closed, and the auxiliary power supply 8
As a result, a current is supplied to the set terminal 10s of the relay 10a, an exciting current flows through the setting coil, and the respective relay contacts K1 and K2 close as in the case of the ground fault, and an alarm is issued by the buzzer 10b and the indicator lamp 10h. Is issued. When the alarm circuit 10 is released, as in the case of the ground fault, the cause of the accident is clarified and countermeasures are taken, and then the circuit breaker 3 and the MCCB 9 are closed by manual operation.
The alarm is released by operating the alarm release switch PB. Thereafter, the high-voltage load switch 1 installed near the alarm circuit 10 is turned on, so that the high-voltage load switch 1 is turned on.
Is set in a control state by the SOG control circuit 2 to prevent a spillover accident to the power company.

As described above, in the present embodiment, the high-voltage load switch is opened in the event of a ground fault and an overcurrent fault, and a warning is given to prevent the spread of the fault to the power company due to the operation of the alarm circuit. In addition, since the auxiliary power supply has a charging function, an alarm is reliably issued in the event of a ground fault or an overcurrent accident due to normal charging. When the alarm circuit is released and the high-voltage load switch is turned on, the alarm cannot be released unless the circuit breaker and MCCB installed on the output side of the high-voltage load switch are turned on. For this reason, it is possible to prevent a switching operation error in which the high-voltage load switch is turned on in a state where the circuit breaker 3 and the MCCB 9 are not turned on, leading to a ripple accident. Furthermore, since the alarm circuit is installed beside the high-voltage load switch, it is thoroughly ensured that the high-voltage load switch must only be turned on after the alarm has been released, thus further preventing the switching operation error. Becomes possible. Also, since the relay has a mechanical holding mechanism,
It is possible to reduce the power consumption when the alarm is activated, and it is easy to issue the alarm for a long time.

The alarm is generated and released by using a keep relay in the alarm circuit.
In the case of the structure where the contact of the R switch continuously contacts,
It is desirable to use a relay in which the input exciting current to the set terminal by these contacts acts preferentially over the input exciting current to the reset terminal. Further, a semiconductor device may be used instead of the relay. For example, an SO switch and a G switch are connected to the base terminal of one NPN transistor.
An alarm start signal is input from the R switch, a collector terminal is connected to a positive terminal ts1 via a buzzer or the like, and an emitter terminal is connected to a negative terminal th1 to input a high-level voltage to the start signal terminal to generate an alarm. And the other N
The alarm may be canceled by turning off one NPN transistor with the PN transistor.

In the embodiment, the CB interlocking switch 3a and the MCCB interlocking switch 9a as circuit breaker closing detection means are constituted by switches which operate in conjunction with the circuit breakers 3 and MCCB9, respectively. However, the present invention is not limited to this, and may be configured by a switch that opens and closes according to a current detected by a current transformer provided in an electric circuit of each circuit breaker. The CB interlock switch 3a and the MC
Instead of the CB interlock switch 9a, the circuit breaker 3 and M
A semiconductor switch that is turned on and off by opening and closing the CCB 9 may be used.

In the embodiment, the alarm release switch PB
Although the signal for canceling the alarm is input to the reset terminal of the relay via the above, the cancel signal may be directly input to the reset terminal by omitting the alarm cancel switch PB. In this case, the alarm is automatically released by the closing operation of the circuit breaker 3 and the MCCB 9. In this embodiment, a relay that closes the relay contact by applying an exciting current to the relay is used. However, a GR switch or the like is opened in the event of a ground fault, etc. When a switch having an open structure is applied, a relay having a structure in which the relay contact opens when the exciting current is applied and closes when the exciting current is interrupted, contrary to the embodiment. Can be.

In this embodiment, the auxiliary power supply and the MCC
Although B is provided in the cubicle, it is not limited to this and may be provided in the indoor substation.

[0033]

As described above, according to the first aspect, in the event of a ground fault and an overcurrent accident, the high-voltage load switch is opened and the alarm means is activated to generate an alarm, thereby spreading the alarm to the power company. This has the effect of urging attention so that it does not spread to an accident. Further , when the alarm means is canceled and the high-voltage load switch is turned on again, the alarm is not released until after the circuit breaker installed on the output side of the high-voltage load switch is turned on. For this reason, it is possible to avoid a switching operation error such that a spillover accident is caused by switching on the high-voltage load switch without switching on the circuit breaker.

Furthermore, in the second aspect, the detected signal to start the operation of the alarm by the opening operation detecting means, thereby enabling stopping the operation of the alarm by a signal detected by the circuit breaker on detection means. For this reason, it is possible to reliably generate an alarm at the time of a ground fault or an overcurrent accident and cancel the alarm after the circuit breaker is turned on. Further, in claim 3 ,
Since the generation and release of the alarm by the alarm device are switched using the relay, the alarm means can be realized with a simple configuration.

According to the fourth aspect of the present invention, since the relay has a mechanical holding mechanism, it is possible to reduce the power consumption at the time of the alarm operation, to use a small storage battery, and to provide a longer alarm. It is easy to emit time. Furthermore, since the auxiliary power supply has a storage battery in claim 5 , the auxiliary power supply can be switched to the operating state at any time by charging at normal time, and an alarm is surely issued at the time of a ground fault and an overcurrent accident. Have.

Further, in claim 6 , since the alarm means is installed near the high-voltage load switch, it is strictly stated that the high-voltage load switch must be turned on only after the alarm is released. The synergistic effect with claim 1 makes it possible to further avoid a mistake in the closing operation.

[Brief description of the drawings]

FIG. 1 is a single-line diagram of a private electric facility provided with a high-voltage load switch-on alarm device according to an embodiment.

FIG. 2 is a circuit diagram showing one embodiment according to the present invention.

FIG. 3 is a schematic configuration diagram of an embodiment according to the present invention.

FIG. 4 is a single-line diagram of a conventional private electric facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High voltage load switch 2 SOG control circuit 2a SO switch 2b GR switch 3 Circuit breaker (CB) 3a Interlock switch for CB 8 Auxiliary power supply 9 Circuit breaker (MCCB) 9a Interlock switch for MCCB 10 Alarm circuit 10a Relay 10s set Terminal 10r Reset terminal 10c Common terminal 10b Buzzer 10h Indicator light K1, K2 Relay contact PB Alarm release switch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-156221 (JP, A) JP-A-63-262020 (JP, A) JP-A-50-61647 (JP, A) 201028 (JP, U) Japanese Utility Model Showa 57-98127 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02H 3/00-3/08

Claims (6)

(57) [Claims] 1. A high-voltage load switch interposed between a power transmission side and a power reception side, and operated by an operation power supply supplied from the power reception side to detect a ground fault or an overcurrent on the load side of the high-voltage load switch. A switch control means for opening the high-voltage load switch, and an auxiliary power supply independent of the operation power supply, and issues an alarm based on the operation of the switch control means when the high-voltage load switch is opened. Alarm means, and the alarm means
Is the closing operation of the circuit breaker inserted in the operation power supply system on the power receiving side.
An alarm device for turning on a high-voltage load switch , wherein the alarm is released after the operation is completed . 2. A high-voltage negative electrode inserted between a power transmission side and a power reception side.
Operates with load switch and operation power supplied from the power receiving side
Ground fault or overcurrent was detected on the load side of the high voltage load switch
Switch control means for sometimes opening the high-voltage load switch
And a circuit breaker inserted in the operation power supply system on the power receiving side,
Alarm means operated by an auxiliary power supply independent of the operation power supply
Wherein the alarm means opens the switch control means.
Opening operation detecting means for detecting an operation, and closing of the circuit breaker
Circuit breaker closing detecting means for detecting the opening operation.
The alarm starts when the detecting means detects the opening operation
And the breaker closing detection means detects breaker closing.
Alarms can be stopped when
And a high-voltage load switch-on alarm. 3. The opening operation detecting means, wherein:
Is set when an open operation is detected by the
Alarm released when circuit breaker closing is detected by ON detection means
A relay that is reset when the switch is operated,
Activated by the auxiliary power when setting the relay
And an alarm that is deactivated when reset
3. The high-voltage load switch switch-on alarm according to claim 2, wherein
Information device. 4. The relay according to claim 1 , wherein said relay contact comprises a mechanical switch.
4. The height according to claim 3, further comprising a holding mechanism.
Pressure load switch closing alarm. 5. The power supply according to claim 1, wherein the auxiliary power supply has a storage battery.
The high-voltage load according to any one of claims 1 to 4, wherein
Switch closing alarm. 6. The high pressure load switchgear according to claim 6 , wherein
6. The device according to claim 1, wherein the device is installed in the vicinity.
A high-voltage load switch closing alarm device according to any of the above .