JPH0879962A - High-voltage load switch closing alarm device - Google Patents

Abstract

(57) [Summary] [Purpose] Preventing accidents when switching on various switches at the time of a ground fault or overcurrent accident, and avoiding a ripple accident to the electric power company. [Structure] SOG control circuit 2 in case of ground fault and overcurrent accident
The high voltage load switch 1 is opened by the SO switch 2a and the GR which are linked to the opening operation by the SOG control circuit.
When the switch 2b is turned on, the alarm circuit 10 is supplied with the auxiliary power source 8
The current is supplied to activate the relay 10a in the alarm circuit and an alarm is issued to alert the electric power company of the accident. Then, the alarm can be released after the operation of turning on the circuit breaker 3 and the MCCB 9, and after the alarm is released, the high voltage load switch 1
Since the SOG control circuit 2 is turned on, the SOG control circuit 2 is placed in a control state by the supply of operating power to avoid a ripple accident.

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 transmission accident to an electric power company when the high voltage load switch is opened and then closed again.

[0002]

2. Description of the Related Art Conventionally, a high-voltage load switch is installed on the first pole for power reception of an electric facility for private use for a transmission accident to an electric power company (power transmission side) caused by an accident of a customer's electric equipment (power reception side). However, it is prevented by opening this switch. FIG. 4 shows a single-line connection diagram of private electric equipment equipped with this 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 accident. The power source of this switch control circuit 102 is generally a high-voltage load. It is supplied from the secondary side of the transformer 105 provided on the load side of the switch 101 via a circuit breaker 106.

When the switch control circuit 102 is activated due to a ground fault or an overcurrent accident and the high-voltage load switch 101 is opened, the cause of the accident is clarified and appropriate measures are taken for the accident before the load side. It is necessary to turn on the various circuit breakers in order from the one closest 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 then the high voltage load switch 101 and the cutout switch 104 are provided. 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 switched to the vacuum circuit breaker 10.
3. Since the high voltage load switch 101 is supplied through the cutout switch 104 and the transformer 105 and is controlled by the switch control circuit 102, it is possible to avoid a ripple accident to the electric power company.

[0004]

However, in the above-mentioned conventional example, when the high-voltage load switch 101 is turned on when all the circuit breakers are not turned on, the switch control circuit 102 is turned on. Since the power is not supplied, the control operation cannot be performed, and when the high-voltage load switch 101 does not shift to the open state, there is a risk of a ripple accident to the electric power company. In addition, even if the high-voltage load switch 101 is turned on without sufficient treatment of the accident or the cause is unknown, power may not be supplied to the switch control circuit 102, and there is a risk of a ripple accident at this time as well. is there.

[0005] Generally, in order to prevent mistakes in closing the various circuit breakers, a closing procedure manual that describes accident procedures is prepared and is well known, but when an accident occurs and a power failure occurs, It is difficult to prevent human error completely, because the procedure for recovery from an early stage does not necessarily follow the procedure. Therefore, in the closing operation of the high-voltage load switch, there is an unsolved problem that various closing errors must be surely prevented and the occurrence of a ripple accident must be avoided.

Therefore, in the spread accident prevention device according to the present invention, it is an object of the present invention to solve the above-mentioned unsolved problems and to prevent mistakes in reclosing the various circuit breakers at the time of a ground fault and an overcurrent accident, and It is an object of the present invention to provide a high voltage load switch closing alarm device capable of avoiding a transmission accident to a vehicle.

[0007]

In order to solve the above problems, a high voltage load switch closing alarm device according to a first aspect of the present invention includes a high voltage load switch interposed between a power transmitting side and a power receiving side, and the power receiving side. Switch control means for opening 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 independent of the operation power supply. And alarm means for issuing an alarm based on the operation of the switch control means when the high-voltage load switch is opened.

In the high voltage load switch closing alarm device according to a second aspect of the present invention, the alarm means is configured to be capable of canceling the alarm after the closing operation of the breaker inserted in the operation power supply system on the power receiving side is completed. It is characterized by Claim 3
The high-voltage load switch closing alarm device according to (1) is a high-voltage load switch inserted between the power transmission side and the power receiving side, and a ground fault on the load side of the high-voltage load switch operated by operating power supplied from the power receiving side. Alternatively, a switch control means for opening the high-voltage load switch when an overcurrent is detected, a circuit breaker interposed in the operation power supply system on the power receiving side, and an auxiliary power supply independent of the operation power supply are operated. Alarm means, the alarm means having an opening operation detecting means for detecting an opening operation of the switch control means, and a circuit breaker closing detecting means for detecting closing of the circuit breaker, and the opening operation detection The operation of the alarm is started when the opening operation is detected by the means, and the operation of the alarm can be stopped when the opening of the circuit breaker is detected by the circuit breaker closing detection means. .

Further, in the high voltage load switch closing alarm device according to a fourth aspect, the alarm means is set when the opening operation detecting means detects an opening operation, and the circuit breaker closing detecting means turns on the circuit breaker. A relay that is reset when the alarm release switch is operated while detecting the alarm, and an alarm that is activated by the auxiliary power source when the relay is set and is deactivated when reset. Characterize.

The high-voltage load switch closing alarm device according to a fifth aspect of the invention is characterized in that the relay has a mechanical holding mechanism for the relay contact. The high voltage load switch closing alarm device according to claim 6 is characterized in that the auxiliary power source has a storage battery. Further, a high voltage load switch closing alarm device according to a seventh aspect of the present invention is characterized in that the alarm means is installed in the vicinity of the high voltage load switch.

[0011]

According to the first aspect of the present invention, when a ground fault or an overcurrent accident occurs, the switch control means opens the high-voltage load switch and an alarm is issued by an auxiliary power source 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.

According to the second aspect of the invention, the alarm means can be released by reclosing the circuit breaker that was cut off when a ground fault or an overcurrent accident occurred. The alarm is automatically released later, or the alarm is released by operating the alarm release switch after the circuit breaker is turned on. Further, according to the invention of claim 3, when the high-voltage load switch is opened due to the ground fault and the overcurrent, the opening operation detection means detects the opening operation of the switch control means, thereby starting the alarm operation. Then, the circuit breaker closing detection means detects that the interrupted circuit breaker is reclosed, thereby stopping the operation of the alarm.

According to the invention of claim 4, the alarm means includes a relay and an alarm device, and the relay is set when the opening operation is detected by the opening operation detecting means, and an alarm device such as a buzzer is activated. Then, when the alarm release switch is operated while the circuit breaker closing detection means detects the circuit breaker closing, the relay is reset and the alarm circuit is deactivated. Further, according to the invention of claim 5, 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 is mechanical. Retained by a mechanical mechanism.

According to the sixth aspect of the invention, the high voltage load switch closing alarm device is operated by the storage battery at the time of a power failure due to a ground fault and an overcurrent. Further, according to the invention of claim 7, the alarm means is installed near the high-voltage load switch, so that the alarm means is released 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 connection diagram of private electrical equipment equipped with a high-voltage load switch closing alarm device according to the present invention.
As shown in the figure, a high-voltage load switch 1 for inputting power from a power transmission line DL on the power transmission side is installed on the first pole for power reception of a private electric facility on the power reception side. A ground fault trip type (SOG) control circuit 2 with an overcurrent accumulation trip is connected as a controller for controlling the SOG.
When a ground fault or an overcurrent accident occurs in the 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 open. The output power of the high-voltage load switch 1 is supplied into a cubicle (high-voltage power receiving equipment) 11, and a circuit breaker (CB) 3 that cuts off the electric line when an overcurrent occurs, a current transformer 4 that detects an overcurrent flowing through the electric line, and a step-down voltage. It is sent to the substations 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 SOG control circuit 2 is supplied to the auxiliary power source 8 serving as the power source of the high-voltage load switch closing alarm device, and the voltage of the secondary side output of the transformer 31 is passed through the circuit breaker (MCCB) 9.
Is supplied as a power source for operation. Here, the SOG control circuit 2 immediately opens the high-voltage load switch 1 at the time of a ground fault, temporarily holds the closed circuit of the high-voltage load switch 1 at the time of an overcurrent accident, and operates the electric circuit breaker 3 so that the high-voltage load switch 1 thereafter does not operate. After the power line is cut off and a power failure occurs, the high voltage load switch 1 is automatically opened by the no-voltage condition of the power supply to the SOG control circuit 2, and when the overcurrent and the ground fault accident overlap, Operates by giving priority to current accident operation. Also, this SOG
The control circuit 2 is provided with an SO switch 2a and a GR switch 2b, which are interlocked with the opening operation by the SOG control circuit 2 and have a contact point which is momentarily closed and which are connected in parallel. The switch 2a operates during overcurrent, and the GR switch 2b operates during ground fault.

The output of the auxiliary power source 8 is supplied to the alarm circuit 10 as an alarm start signal via the SO switch 2a and the GR switch 2b, and is connected in series as a circuit breaker closing detection means. It is supplied to the alarm circuit 10 as an alarm cancellation 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 of the electric circuit breaker 3 by closing operation, and the MCCB interlocking switch 9a interlocks with the closing of the MCCB 9 by closing operation of the circuit breaker 3.

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

As shown in FIG. 2, the alarm circuit 10 has a positive electrode terminal ts1 and a negative electrode terminal th1 which are connected to the output terminals tp and tn of the auxiliary power supply 8, respectively, and between the positive electrode terminal ts1 and the negative electrode terminal th1. The relay contact K1 and the buzzer 10b connected in series, the relay contact K2 connected in series and the indicator lamp 10h are connected in parallel, and the relay 1
The set terminal 10s of 0a is connected to a start signal terminal ts to which an alarm start signal is input from the SOG control circuit 2, and the reset terminal 10r of the relay 10a is connected to one end of an alarm release switch PB which gives an alarm release signal to the relay 10a. , The other end of the relay 10a is connected to the release signal terminal tk to which the alarm release permission signal is supplied, and the common terminal 10c of the relay 10a.
Is connected to the negative electrode terminal th1. Since the relay contacts of the relay 10a are held by the mechanical holding mechanism, the contacts of the relay contacts K1 and K2 are held even after there is no exciting current after being operated by the exciting current.

Further, one end of the SO switch 2a and the GR switch 2b which are arranged in parallel are connected to the starting signal terminal ts, and the other end is connected to the terminal ts2 (ts3) having the same voltage level as the positive electrode terminal ts1. There is. Further, one end of the MCCB interlocking switch 9a and the CB interlocking switch 3a connected in series is connected to the release signal terminal tk, and the other end is a terminal ts4 having the same voltage level as the positive electrode terminal ts1.
It is connected to the.

FIG. 3 shows a schematic block diagram of the high-voltage load switch closing alarm device 1 connected as described above. The high-voltage load switch 1, the SOG control circuit 2, and the alarm circuit 10 are respectively installed on the power receiving first pillar 33, and in the cubicle 11,
Auxiliary power source 8 having storage battery 8b, circuit breaker 3 and M
CB interlocking switch 3a attached to each CCB 9
And an MCCB interlocking switch 9a.

In addition to the above-mentioned equipment, the following various equipments are connected to the single line connection diagram of FIG. That is,
Between the high-voltage load switch 1 and the circuit breaker 3, a power transformer (PCT) 12 for power supply and demand is provided, and the PCT 12 has various instruments such as a power receiving voltmeter, a power factor meter, a power meter, and an ammeter. Is connected and measurement is performed, and the surge arrester 1 is connected to the electric circuit between the PCT 12 and the circuit breaker 3 via the disconnector 13.
4 is connected, and an instrument transformer 16 is connected via a fuse 15. The output side of the circuit breaker 3 is provided with a current transformer 4 for detecting an overcurrent flowing in the circuit, and the current transformer 4 opens 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. In addition, the secondary side of the step-down transformer 5 is connected to a ground capacitor 21 for detecting a zero-phase voltage for ground fault protection via a high-voltage cutout 20.
The secondary side output of is supplied to the substations 6a and 6b and the indoor substation 7.

Each of the power distribution stations 6a and 6b has a circuit breaker 2 in the electric line.
5 is provided, the current transformer 26 that detects an overcurrent flowing in the circuit of the output of the circuit breaker 25, the overcurrent relay 27 that operates by the current transformer 26 to open the circuit breaker 25, and the ground of the circuit. There is also provided a ground fault relay 28 which detects a fault current and also opens the circuit breaker 25. In the indoor substation 7,
A high-voltage cutout 29 that protects the electric power supplied from the cubicle 11 against overcurrent and a high-voltage AC load switch 30 with a fuse that also protects against overcurrent are provided, and the supplied electric power passes through the high-voltage cutout 29. It is input to the primary side of the transformer 31 and low-voltage electric power is output from the secondary side. The supplied electric power is input to the primary side of the transformer 32 through the high voltage AC load switch 30, and low voltage electric power is output from the secondary side. Further, as described above, the secondary side of the transformer 31 is connected to the auxiliary power source 8 in the cubicle 11. Further, a voltmeter and an ammeter are arranged on the secondary side of each transformer 31 and 32 to inspect the operating status.

Next, the operation of this embodiment will be described. The case of a ground fault and the 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 instantly opened, and the contact of the GR switch 2b which is interlocked with the operation of the SOG control circuit 2 is closed. Thereby, the set terminal 10s of the relay 10a
To the setting coil of the relay 10a, the relay contacts K1 and K2 are closed, and the buzzer 10b emits an alarm sound.
The h lights up to let you know that an accident has occurred. At this time, the relay contact K is caused by the mechanical holding mechanism of the relay 10a.
1 and K2 remain closed.

In order to release the alarm circuit 10, the cause of the accident is clarified and measures are taken, then the circuit breaker 3 and the MCC are released.
B9 is closed by an artificial operation. This gives C
B interlock switch 3a and MCCB interlock switch 9a
Is closed, and the alarm release switch PB of the alarm circuit 10 installed together with the high voltage load switch 1 on the telephone pole 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 mechanical holding mechanism holds the open state, the alarm sound is stopped, and the indicator lamp lights. Turn off the light.
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 operating power supply of the SOG control circuit 2 is the circuit breaker 3 and the MC.
CB9, and the high voltage load switch 1 is SOG
The control circuit 2 is placed in the control state. As a result, even if the output of the high voltage load switch 1 is in the ground fault state, the SOG
Control by the control circuit 2 is performed, and a ripple accident to the electric power company is avoided.

By the way, when the CB interlock switch 3a and / or the MCCB interlock switch 9a are not closed, the operating power is not supplied to the SOG control circuit 2 when the high voltage load switch 1 is turned on, and the high voltage load switch 1 is in the control state. Therefore, if the high-voltage load switch 1 is turned on in a state in which the countermeasure for the ground fault is insufficient, there is a risk that the accident will spread to the electric power company.

In the case of an overcurrent accident, the power supply to the MCCB 9 is cut off by opening the electric circuit breaker 3, and the high voltage load switch 1 is opened by the SOG control circuit 2 in the no-voltage state. At this time, the contact of the SO switch 2a that is interlocked with the operation of the SOG control circuit 2 is closed, and the auxiliary power source 8
As a result, an electric current is supplied to the set terminal 10s of the relay 10a, and an exciting current flows through the set coil. As in the case of the ground fault, the relay contacts K1 and K2 are closed and the buzzer 10b and the indicator lamp 10h give an alarm. Is emitted. Even when the alarm circuit 10 is released, the cause of the accident is clarified and countermeasures are taken, and then the circuit breaker 3 and the MCCB 9 are closed by an artificial operation, as in the case of the ground fault.
The alarm is released by operating the alarm release switch PB. After that, by turning on the high-voltage load switch 1 installed near the alarm circuit 10, the high-voltage load switch 1
Is placed in a control state by the SOG control circuit 2 to prevent a transmission accident to the electric power company.

As described above, in this embodiment, caution is urged so that the high voltage load switch is opened at the time of a ground fault and an overcurrent accident, and the alarm circuit is actuated so as not to spread to a power company. In addition, since the auxiliary power supply has a charging function, the alarm can be reliably issued in the event of a ground fault or an overcurrent accident by charging in the normal state. When the alarm circuit is released and the high-voltage load switch is turned on, the alarm can be released only after the circuit breaker and MCCB installed on the output side of the high-voltage load switch are turned on. Therefore, it is possible to prevent a closing operation error, which may cause a ripple accident because the high-voltage load switch is turned on without turning on the circuit breaker 3 and the MCCB 9. Furthermore, since the alarm circuit is installed near the high-voltage load switch, it is thoroughly ensured that the high-voltage load switch must only be closed after the alarm has been released, further preventing mistakes in the closing operation. Is possible. Also, because the relay has a mechanical holding mechanism,
The power consumption when the alarm is activated can be reduced, and the alarm can be easily issued for a long time.

Although the alarm is issued and released by using a keep relay in the alarm circuit, the SO switch and G
In the case of a structure in which the contacts of the R switch are in continuous contact,
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. Alternatively, a semiconductor element may be used instead of the relay. For example, the SO switch and the G are connected to the base terminal of one NPN transistor.
The alarm start signal is input from the R switch, the collector terminal is connected to the positive terminal ts1 via a buzzer, etc., and the emitter terminal is connected to the negative terminal th1. And other N
The alarm may be released by turning off one NPN transistor with the PN transistor.

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

Further, 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 alarm cancel switch PB, the signal for canceling may be directly input to the reset terminal. In this case, the alarm is automatically canceled by the closing operation of the circuit breaker 3 and the MCCB 9. Further, in the present embodiment, a relay is used in which the relay contact is closed by supplying an exciting current to the relay. However, the GR switch or the like is opened at the time of a ground fault or the like, and the CB interlock switch or the like is opened at the time of reclosing. When a switch with an open structure is applied, conversely to the embodiment, use a relay with a structure in which the relay contact opens when the exciting current is being applied and the relay contact is closed when the exciting current is interrupted. You can

In this embodiment, the auxiliary power source and MCC are used.
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 claim 1, 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 give an alarm, which is transmitted to the electric power company. The effect is to call attention so as not to spread to an accident. In the second aspect, when the alarm means is released and the high-voltage load switch is turned on again, the alarm is not released only 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 closing operation error in which a ripple accident occurs because the high-voltage load switch is closed without the breaker being closed.

Further, in the third aspect, the alarm operation can be started by the signal detected by the opening operation detecting means, and the alarm operation can be stopped by the signal detected by the circuit breaker closing detection means. Therefore, it is possible to reliably issue an alarm in the event of a ground fault and an overcurrent accident and to release the alarm after the circuit breaker is turned on. Further, in claim 4,
Since the generation and cancellation of the alarm by the alarm device is switched using the relay, the alarm means can be realized with a simple configuration.

Further, in the present invention, since the relay has the mechanical holding mechanism, it is possible to reduce the power consumption when the alarm is activated, a small storage battery can be used, and the alarm can be prolonged. It becomes easy to emit time. Further, in claim 6, since the auxiliary power source has a storage battery, the auxiliary power source can be switched to the operating state at any time by charging in the normal state, and an alarm can be reliably issued in the event of a ground fault or an overcurrent accident. Have.

Further, in claim 7, since the alarm means is installed in the vicinity of the high-voltage load switch, it is thoroughly ensured that the high-voltage load switch must be turned on only after the alarm is released. Due to the synergistic effect with the second aspect, it is possible to further avoid a mistake in making operation.

[Brief description of drawings]

FIG. 1 is a single-line connection diagram of a private electrical facility equipped with a high voltage load switch closing alarm device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an 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 connection diagram of a conventional private electrical installation.

[Explanation of symbols]

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

Claims (7)

[Claims] 1. A high voltage load switch interposed between a power transmitting side and a power receiving side and an operating power supply supplied from the power receiving side to detect a ground fault or overcurrent on the load side of the high voltage load switch. Sometimes, the switch control means for opening the high-voltage load switch and an auxiliary power supply independent of the operating power supply are operated, and an alarm is issued based on the operation of the switch control means when the high-voltage load switch is opened. A high voltage load switch closing alarm device, comprising: an alarm means. 2. The high-voltage load according to claim 1, wherein the alarm means is configured to be capable of canceling the alarm after the closing operation of the circuit breaker inserted in the operation power supply system on the power receiving side is completed. Switch-on alarm device. 3. A high voltage load switch interposed between the power transmitting side and the power receiving side and an operating power supply supplied from the power receiving side to detect a ground fault or overcurrent on the load side of the high voltage load switch. A switch control means for opening the high-voltage load switch at times, a circuit breaker inserted in the operation power supply system on the power receiving side,
An alarm unit that operates with an auxiliary power source independent of the operation power source is provided, and the alarm unit includes an opening operation detection unit that detects an opening operation of the switch control unit, and a circuit breaker that detects closing of the circuit breaker. A closing detection means for starting an alarm when the opening operation detection means detects an opening operation, and for starting an alarm when the circuit breaker closing detection means detects a closing of the circuit breaker. A high voltage load switch closing alarm device characterized by being configured to be stopped. 4. The alarm means is set when the opening operation is detected by the opening operation detection means, and the alarm release switch is operated while the circuit breaker is detected by the circuit breaker closing detection means. The high voltage load switch closing alarm according to claim 3, further comprising: a relay that is reset to a high voltage and a warning device that is activated by the auxiliary power supply when the relay is set and is deactivated when reset. apparatus. 5. The high voltage load switch closing alarm device according to claim 4, wherein the relay has a mechanical holding mechanism for the relay contact. 6. The high voltage load switch closing alarm device according to claim 1, wherein the auxiliary power source has a storage battery. 7. The high voltage load switch closing alarm device according to claim 1, wherein the alarm means is installed in the vicinity of the high voltage load switch.