Power supply control device and power supply control system

Abstract

The present invention provides a power control device and power control system that can detect signs of an impending tripping of a ground fault circuit breaker. [Solution] A power supply control device 6 controls the supply of power to a charging outlet 8 via a remote-controlled earth leakage circuit breaker 7, which has the function of shutting off the power supply circuit when an abnormal current, including an earth leakage current, flows, and also has the function of opening and closing the power supply circuit by remote operation. The power supply control unit 61 performs control to shut off the power supply circuit of the remote-controlled earth leakage circuit breaker 7 when it detects a current value that is greater than or equal to a threshold value that is smaller than the current value at which the remote-controlled earth leakage circuit breaker 7 trips due to an abnormal current.

Description

[Technical Field]

[0001] The present invention relates to an energization control device and an energization control system. [Background Art]

[0002] In recent years, power supply systems that switch power sources according to situations have been proposed (see, for example, Patent Document 1).

[0003] The power supply system described in Patent Document 1 includes a switchboard having a main breaker, an earth leakage breaker, a contactor (electromagnetic contactor) and a plurality of branch breakers, a charging / discharging device, and an electric vehicle connected to the charging / discharging device via a connector. When the commercial power system fails, the power from the battery unit constituting the charging / discharging device is supplied to the residential load. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2023-053370 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] According to conventional power supply systems, when an earth leakage breaker trips (circuit interruption) for some reason, after it is found that energization cannot be performed while the contactor is in the ON state (main contact closed state), the state of the earth leakage breaker must be checked to investigate the cause of the trip. For example, when an earth leakage breaker is installed in parking equipment (including a charging outlet) of a multi-story parking lot of an apartment building, the distance from the management office to the earth leakage breaker imposes a heavy burden of confirmation work on the administrator.

[0006] An object of the present invention is Earth leakage circuit breaker with overcurrent protection function to provide an energization control device and an energization control system capable of detecting a sign of tripping before the trip occurs. [Means for solving the problem]

[0007] [1] Earth leakage or past It has the function of autonomously shutting off the power supply circuit when current flows, as well as the function of opening and closing the power supply circuit by remote control, and is provided separately from the power supply control device. Earth leakage circuit breaker with overcurrent protection function A power supply control device that controls the supply of power to a charging outlet via, The aforementioned Earth leakage circuit breaker with overcurrent protection function but Electrical leakage or overcurrent When a current value greater than or equal to a threshold value smaller than the current value at which the device autonomously trips is detected, Electrical leakage or overcurrent The current Earth leakage circuit breaker with overcurrent protection function Before it autonomously trips, the aforementioned Earth leakage circuit breaker with overcurrent protection function The block command signal for remotely controlling the device is described above. Earth leakage circuit breaker with overcurrent protection function A power supply control device comprising a control unit that transmits a signal to shut off the power supply circuit. [2] A leakage sensor for detecting leakage current, It further includes a current sensor that detects overcurrent, The control unit is the Earth leakage circuit breaker with overcurrent protection function However, when the leakage sensor detects a current value greater than or equal to a first threshold value that is smaller than the first current value at which the device trips autonomously due to leakage, or when the current sensor detects a current value greater than or equal to a second threshold value that is smaller than the second current value at which the device trips autonomously due to overcurrent, the device will trip due to leakage or overcurrent. Earth leakage circuit breaker with overcurrent protection function Before it autonomously trips, the aforementioned Earth leakage circuit breaker with overcurrent protection function The block command signal for remotely controlling the device is described above. Earth leakage circuit breaker with overcurrent protection function The power supply control device according to [1], which transmits to and performs control to shut off the power supply circuit. [3] The first threshold is 25-50% of the first current value, The energizing control device according to [2], wherein the second threshold is 90% or more and less than 100% of the second current value. [4] A power supply control system that supplies power from an external power source to an electric vehicle via a charging outlet, A power supply control device that controls the supply of power to the charging outlet, A power supply control device is provided between the charging outlet and the power supply control device, which is designed to prevent leakage current. or past autonomously cuts off the energization circuit when a current flows therethrough, has a function of opening and closing said energization circuit by remote control, and is provided separately from said energization control device Earth leakage circuit breaker with overcurrent protection function and comprising: said energization control device, when said Earth leakage circuit breaker with overcurrent protection function detects a current value equal to or greater than a threshold smaller than a current value at which it autonomously trips due to overcurrent, Electrical leakage or overcurrent Electrical leakage or overcurrent before said Earth leakage circuit breaker with overcurrent protection function autonomously trips due to overcurrent, said Earth leakage circuit breaker with overcurrent protection function transmits a shutoff command signal for remote operation to said Earth leakage circuit breaker with overcurrent protection function to perform control to shut off the energization circuit. An energization control system. Effects of the Invention

[0008] According to the present invention, Earth leakage circuit breaker with overcurrent protection function the sign can be detected before the device trips. Brief Description of Drawings

[0009] [Figure 1] FIG. 1 is a diagram showing an example of an energization control system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing a detailed configuration of the energization control device. [Figure 3] FIG. 3 is a flowchart showing an example of an earth leakage detection operation of the energization control device. [Figure 4] FIG. 4 is a flowchart showing an example of an overcurrent detection operation of the energization control device. Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, components having substantially the same function are denoted by the same reference numerals, and duplicate description thereof is omitted.

[0011] ​Figure 1 is a diagram showing an example of an energization control system according to an embodiment of the present invention. This energization control system 1 includes a server 2, a controller 4 connected to the server 2 via a network 3, and a plurality of energization control devices 6 installed in parking facilities (multi-story parking lots, mechanical parking lots, flat parking lots, etc.) and connected to the controller 4 via a serial communication path 5, and a plurality of Earth leakage circuit breaker with overcurrent protection function 7 connected to each energization control device 6, and each Earth leakage circuit breaker with overcurrent protection function 7 connected to a plurality of charging outlets 8 for charging electric vehicle C, and a molded case circuit breaker 11 provided between an external power source 9 and the energization control device 6 that cuts off the circuit when an overcurrent flows from the external power source 9 or in other cases. An electric wire 10 extends from the external power source 9 to the molded case circuit breaker 11, the energization control device 6, Earth leakage circuit breaker with overcurrent protection function 7, and the charging outlet 8. The number of energization control devices 6, Earth leakage circuit breaker with overcurrent protection function 7, and charging outlets 8 is provided according to the number of electric vehicles C that can be charged simultaneously (four in the figure).

[0012] The server 2 communicates with the controller 4 via the network 3 using, for example, the Open Charge Point Protocol (OCPP). OCPP is an open international standard communication protocol (application protocol) for managing chargers for electric vehicles C. The server 2 also transmits and receives information related to charging via the network 3 to and from a mobile terminal 14 owned by a user who uses the electric vehicle C. An application for reservation and payment related to charging (hereinafter referred to as a "charging application") is pre-installed in the mobile terminal 14.

[0013] The server 2 transmits and receives various messages to and from the controller 4 through communication using OCPP. That is, based on a request from a user of the electric vehicle C, the server 2 transmits messages such as reservation charging information and a charging start instruction to the energization control device 6 via the controller 4. After charging is completed, the energization control device 6 transmits a message such as a charging completion notification to the server 2 via the controller 4.

[0014] Messages sent from Server 2 to the Power Control Device 6 include, for example, a vehicle ID that identifies the electric vehicle C (e.g., vehicle registration number (license plate number), vehicle identification number (VIN), etc.), a parking facility ID that identifies the parking facility where the charging outlet 8 is installed, an immediate charging request or a scheduled charging start time, and charging conditions. The charging conditions may be, for example, a specified output power amount, or an output power amount that fully charges the battery. Messages sent from the Power Control Device 6 to Server 2 include, for example, the vehicle ID, parking facility ID, charging start time, charging end time, battery charge rate (SoC: State of Charge), and output power amount. Server 2 processes the user's billing based on the output power amount sent from the Power Control Device 6.

[0015] Network 3 is an OCPP-compatible network, and can utilize technologies such as LAN (Local Area Network), LTE (Long Term Evolution), Wi-Fi (Wireless Fidelity), and the Internet.

[0016] Controller 4 communicates with Server 2 via Network 3 using OCPP, and also communicates with multiple power control devices 6 via a serial communication channel 5. Controller 4 also has an external communication interface for communicating with Server 2 via Network 3. The external communication interface allows for the selection of multiple communication methods (e.g., LAN, LTE, Wi-Fi, etc.) by the administrator of the power control devices 6.

[0017] The power control device 6 is compatible with serial communication standards and communicates with the controller 4 via the serial communication channel 5. The serial communication channel 5 can use a communication channel compliant with serial communication standards such as RS485 or RS232C. RS485 allows for faster and longer-distance data transmission than RS232C. Each power control device 6 is installed, for example, in the same parking facility. Parking facilities are installed in, for example, apartment buildings, accommodations, tourist facilities, golf courses, large commercial facilities, etc. The power control device 6 is powered from an external power supply 9 via a power line 10. Earth leakage circuit breaker with overcurrent protection function The power supply control device 6 charges the battery of the electric vehicle C, which is connected to the charging outlet 8 via 7. , regulation Control signals are transmitted via wire 13. Earth leakage circuit breaker with overcurrent protection function Send to 7. The control signals will be described later.

[0018] Earth leakage circuit breaker with overcurrent protection function 7 has the function of shutting off the power supply circuit when an abnormal current, including lightning surge current and leakage current, flows, and also the function of opening and closing the power supply circuit remotely. The power supply circuit is a circuit that connects the input power line 101 and the output power line 101. Earth leakage circuit breaker with overcurrent protection function Details regarding point 7 will be discussed later. Earth leakage circuit breaker with overcurrent protection function When a trip occurs, unit 7 notifies the power supply control device 6 of the trip via the trip detection line 12.

[0019] The external power supply 9 has a rated output power (e.g., 4kW) capable of supplying AC power (e.g., AC200V, 20A) to the electric vehicle C via the wire 10. The external power supply 9 is, for example, a single-phase AC power supply and has three output terminals. The wire 10 consists of a pair of power lines 101 and a grounding wire 102 (see Figure 2). A pair of power lines 101 are connected to a pair of output terminals, and the grounding wire 102 is connected to the remaining output terminal. The external power supply 9 may also be a three-phase AC power supply. Furthermore, the external power supply 9 may supply AC100V AC power, and its rated output power (output performance) may be greater than 10kW, or 10kW or less, 16kW or less, 3kW or less, etc. In addition, if the electric vehicle C is compatible with a rapid charger, the external power supply 9 will supply DC power.

[0020] Electric vehicle C is a vehicle equipped with a battery (storage battery). Note that electric vehicle C may also be an EV (electric vehicle) or a PHV (plug-in hybrid vehicle). By plugging electric vehicle C into the charging socket of the charging outlet 8, the battery is charged from an external power source 9 via the power supply control device 6.

[0021] The mobile device 14 can be, for example, a smartphone, a smartwatch, or other smart device. The user of the mobile device 14 accesses a webpage provided by server 2 using a charging app, registers a vehicle ID in advance, and registers charging reservation information, including parking facilities, immediate charging request or scheduled charging start time, and charging conditions, on the webpage provided by server 2.

[0022] Figure 2 shows the power supply control device 6 and Earth leakage circuit breaker with overcurrent protection function This is a diagram showing an example of the configuration of 7. A pair of power lines 101 and a ground line 102 are derived from each of the three output terminals of the external power supply 9, and these power lines 101 and ground line 102 are connected as follows: Earth leakage circuit breaker with overcurrent protection function It is routed through 7 to the charging outlet 8.

[0023] ( Earth leakage circuit breaker with overcurrent protection function (Composition) Earth leakage circuit breaker with overcurrent protection function 7 is as shown in Figure 2, Earth leakage circuit breaker with overcurrent protection function Control 7 The system The unit comprises a control unit 71, an on / off switch 72 for opening and closing a pair of power lines 101, a leakage current detection circuit 73 for detecting leakage current occurring in the power lines 101, and an overcurrent detection circuit 74 for detecting overcurrent flowing through the power lines 101.

[0024] system The control unit 71, when the leakage current detection circuit 73 detects a leakage current (e.g., 30mA) or the overcurrent detection circuit 74 detects an overcurrent (e.g., 22A), opens the on / off switch 72 (trips) and notifies the power supply control device 6 via the trip detection line 12 that a trip has occurred. Leakage Earth Leakage Breaker (ELB) control (hereinafter 「E This is called "LB control." , regulation Unit 71 is the power supply control device 6 or Ra system When a control signal is transmitted via wire 13, the on / off switch 72 is opened. ruE Perform LB control.

[0025] (Configuration of the power supply control device) The power supply control device 6 comprises a power supply control unit 61 that controls each part of the power supply control device 6, a voltage detection unit 62 that detects voltage at voltage detection positions 62a and 62b of the wire 10 from the external power supply 9, a leakage current detection unit 63 that detects leakage current at leakage current detection position 63a of the wire 10 from the external power supply 9, a current detection unit 64 that detects current at current detection position 64a of the wire 10 from the external power supply 9, and a communication unit 65 that communicates with the controller 4. The voltage detection unit 62, the leakage current detection unit 63, and the current detection unit 64 are examples of detection units.

[0026] The power supply control device 6 is Earth leakage circuit breaker with overcurrent protection function This allows for the detection of signs of 7 tripping before it occurs. To this end, the energization control unit 61, Earth leakage circuit breaker with overcurrent protection function When 7 detects a current value that is greater than or equal to a threshold value that is less than the current value at which it trips due to abnormal currents such as lightning surges and ground faults, Earth leakage circuit breaker with overcurrent protection functionControl is performed to shut off the power supply circuit of 7. Specifically, when the leakage current detection unit 63 detects a current value of 15mA or more, or when the current detection unit 64 detects a current value of 20A or more, Earth leakage circuit breaker with overcurrent protection function This controls the circuit to shut off power to circuit 7.

[0027] The voltage detection unit 62 periodically detects the voltage at voltage detection positions 62a and 62b of the pair of power lines 101 at a predetermined sampling period (for example, 1 second).

[0028] The leakage detection unit 63 periodically detects leakage current flowing through the power lines 101 at a predetermined sampling period (e.g., 1 second) using a leakage sensor (e.g., ZCT: Zero-phase-sequence Current Transformer) 63b provided at the leakage detection position 63a of the pair of power lines 101. When the leakage detection unit 63 detects a current value of 15mA or more, the power supply control unit 61 sends a leakage detection alert to the controller 4 and also activates a leakage detection stop function (when the power supply control device 6 detects leakage current). Earth leakage circuit breaker with overcurrent protection function 7 E If the function to select whether or not to implement LB control is enabled (ON) by the installer, etc. , regulation Control signals are transmitted via wire 13. Earth leakage circuit breaker with overcurrent protection function 7 The Send to Department 71 , regulation 71 E LB control is performed. Also, the power supply control unit 61 is disabled (OFF) when the leakage current detection stop function is set. , regulation Control signals are transmitted via wire 13. Earth leakage circuit breaker with overcurrent protection function 7 The Do not send to Department 71. In other words Chi system 71 E LB control will not be implemented. The first threshold is, Earth leakage circuit breaker with overcurrent protection function The value of 7 is smaller than the first current value at which the device trips due to a short circuit (for example, 30mA) (for example, 50% of the first current value). Note that the first threshold may be 25-50% of the first current value.

[0029] The current detection unit 64 periodically detects the current flowing through the power line 101 at a predetermined sampling period (e.g., 1 second) using a current sensor 64b provided at a current detection position 64a on one of the pair of power lines 101. When the current detection unit 64 detects a current value equal to or greater than a second threshold (e.g., 20A), the power supply control unit 61 sends an overcurrent detection alert to the controller 4 and also activates an overcurrent detection stop function (when the power supply control device 6 detects an overcurrent). Earth leakage circuit breaker with overcurrent protection function 7 E If the function to select whether or not to implement LB control is enabled (ON) by the installer, etc. , regulation Control signals are transmitted via wire 13. Earth leakage circuit breaker with overcurrent protection function 7 The Send to Department 71 , regulation 71 E LB control is performed. Also, the power supply control unit 61 is disabled (OFF) when the overcurrent detection stop function is set. , regulation Control signals are transmitted via wire 13. Earth leakage circuit breaker with overcurrent protection function 7 The Do not send to Department 71. , regulation 71 E LB control is not performed. The second threshold (e.g., 20A) is a value smaller than the second current value (e.g., 22A) (e.g., 91% of the second current value). Note that the second threshold may be between 90% and 100% of the second current value.

[0030] The controller 4 serially transmits a charging start command to the power control device 6 via the serial communication channel 5 to start charging the electric vehicle C. Once charging is complete, the power control unit 61 receives a charging completion notification from the electric vehicle C via the serial communication channel 5. If the reserved charging information includes an immediate charging request, the power control unit 61 immediately transmits a charging start command to the electric vehicle C. If the reserved charging information includes a reserved charging start time, the power control unit 61 transmits a charging start command to the electric vehicle C when the current time reaches the reserved charging start time.

[0031] The power supply control unit 61 calculates the output power at the output terminals based on the voltage value detected by the voltage detection unit 62 and the current value detected by the current detection unit 64, taking into account the voltage drop through the power lines 101 from the output terminals to the voltage detection positions 62a and 62b, at a predetermined sampling period (e.g., 1 second). The power supply control unit 61 transmits the output power value to the controller 4 via the communication unit 65 at a predetermined sampling period (e.g., 1 second) or at a period of n times the predetermined sampling period. Note that the predetermined sampling period is not limited to 1 second, but may be other periods such as 0.5 seconds.

[0032] The power supply control unit 61 draws the necessary power from the power line 101 entry points 61a and 61b. In this embodiment, the power supply entry points 61a and 61b to the power supply control unit 61 are located on the external power supply 9 side, compared to the voltage detection points 62a and 62b and the current detection point 64a.

[0033] When the power supply control unit 61 receives a charging start instruction from the controller 4, it repeatedly instructs the voltage detection unit 62 to detect voltage, the leakage current detection unit 63 to repeatedly detect leakage current, and the current detection unit 64 to repeatedly detect current.

[0034] When the electric vehicle C is fully charged, the power supply control unit 61 sends a charging completion notification to the controller 4 via the serial communication channel 5. This charging completion notification may include, for example, the vehicle ID, charging start time, charging end time, battery charge level (SoC), output power, etc. The power supply control unit 61 may also receive the charging completion notification from the electric vehicle C via a signal line (not shown) or wirelessly.

[0035] The power supply control unit 61 may be configured using hardware such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit). Alternatively, the functions of the power supply control unit 61 may be realized by storing a program in memory such as ROM (Read Only Memory), reading that program into RAM (Random Access Memory), and having the CPU (Central Processing Unit) execute it.

[0036] (Operation of the power supply control system) Next, an example of the operation of the power supply control system 1 will be described with reference to Figures 3 and 4. Figure 3 is a flowchart showing an example of the operation of the power supply control device for leakage current detection. Figure 4 is a flowchart showing an example of the operation of the power supply control device for overcurrent detection.

[0037] (1) Leakage current detection process The power supply control unit 61 of the power supply control device 6 determines whether or not a ground fault has been detected by the ground fault detection unit 63 (S11). If a ground fault is detected (S11: Yes), a ground fault detection alert is sent to the controller 4 (S12).

[0038] Next, the power supply control unit 61 determines whether the ground fault detection stop function is enabled (ON) or disabled (OFF) (S13). If the ground fault detection stop function is set to disabled (OFF) (S13: OFF) , regulation 71 E The process returns to step S11 without performing LB control. If the ground fault detection stop function is enabled (ON) (S13: ON), the power supply control unit 61 , regulation Control signals are transmitted via wire 13. Earth leakage circuit breaker with overcurrent protection function 7 The Send to Department 71 , regulation 71 E LB control is performed (S14), and then the process terminates.

[0039] (2) Overcurrent detection process The power supply control unit 61 of the power supply control device 6 determines whether or not an overcurrent has been detected (S21). If an overcurrent is detected (S21: Yes), an overcurrent detection alert is sent to the controller 4 (S22).

[0040] Next, the power supply control unit 61 determines whether the overcurrent detection stop function is enabled (ON) or disabled (OFF) (S23). If the overcurrent detection stop function is set to disabled (OFF) (S23: OFF) , regulation 71 E The process returns to step S21 without performing LB control. If the overcurrent detection stop function is enabled (ON) (S23: ON), the energization control unit 61 , regulation Control signals are transmitted via wire 13. Earth leakage circuit breaker with overcurrent protection function 7 The Send to Department 71 , regulation 71 E LB control is performed (S24), and then the process terminates.

[0041] (Effects of this embodiment) The energization control system 1 according to this embodiment provides the following effects. (a) Earth leakage circuit breaker with overcurrent protection function When the power supply control device 6 detects a current value that is greater than or equal to a threshold value that is less than the current value at which device 7 trips, Earth leakage circuit breaker with overcurrent protection function The signs of a 7 trip can be detected before it happens. (b) Earth leakage circuit breaker with overcurrent protection function When the signs of 7 were detected before tripping, Earth leakage circuit breaker with overcurrent protection function Turning off switch 7 shuts off the power supply circuit, ensuring the load side remains safe. (c) Earth leakage circuit breaker with overcurrent protection function When the signs of 7 tripping are detected, the power supply control device 6 is notified of this. Earth leakage circuit breaker with overcurrent protection function This eliminates the need to check the status of item 7. (d) Since the output power at the output terminal of the external power supply 9 is estimated by considering the voltage drop in the power line 101 from the output terminal of the external power supply 9 to the voltage detection positions 62a and 62b, the output power can be determined with a certain degree of accuracy (n6 class in the specific measurement system).

[0042] Although embodiments of the present invention have been described above, the embodiments of the present invention are not limited to those described above, and various modifications and implementations are possible. [Explanation of Symbols]

[0043] 1...Power supply control system, 2...Server, 3...Network, 4...Controller, 5...Serial communication channel, 6...Power supply control device, 7... Earth leakage circuit breaker with overcurrent protection function 8...Charging outlet, 9...External power supply, 10...Power wire, 11...Circuit breaker, 12...Trip detection wire, 13 …system 14...Mobile terminal, 61...Power supply control unit, 61a, 61b...Inlet position, 62...Voltage detection unit, 62a, 62b...Voltage detection position, 63...Leakage current detection unit, 63a...Leakage current detection position, 63b...Leakage current sensor, 64...Current detection unit, 64a...Current detection position, 64b...Current sensor, 65...Communication unit, 71 …system 72...Open / close switch, 73...Leakage current detection circuit, 74...Overcurrent detection circuit, 101...Power line, 102...Grounding wire, C...Electric vehicle

Claims

1. A power supply control device that autonomously shuts off the power supply circuit when a leakage current or overcurrent flows, has a function to open and close the power supply circuit remotely, and controls the power supply to the charging outlet via a leakage circuit breaker with an overcurrent protection function that is provided separately from the power supply control device, When the aforementioned earth leakage circuit breaker with overcurrent protection function detects a current value greater than or equal to a threshold value smaller than the current value at which it autonomously trips due to earth leakage or overcurrent, the control unit transmits a tripping command signal to the earth leakage circuit breaker with overcurrent protection function to remotely operate the earth leakage circuit breaker with overcurrent protection function, thereby controlling the interruption of the power supply circuit, before the earth leakage circuit breaker with overcurrent protection function trips autonomously due to earth leakage or overcurrent. A power supply control device equipped with the following features.

2. A leakage sensor that detects electrical leakage, It further includes a current sensor that detects overcurrent, When the leakage sensor detects a current value greater than or equal to a first threshold value smaller than a first current value that causes the overcurrent protection circuit breaker to trip autonomously due to leakage, or when the current sensor detects a current value greater than or equal to a second threshold value smaller than a second current value that causes the overcurrent protection circuit breaker to trip autonomously due to overcurrent, the control unit performs control to interrupt the power supply circuit by transmitting an interruption command signal to the overcurrent protection circuit breaker for remote operation, before the overcurrent protection circuit breaker trips autonomously due to leakage or overcurrent. The power supply control device according to claim 1.

3. The first threshold is 25 to 50% of the first current value. The second threshold is 90% or more and less than 100% of the second current value. The power supply control device according to claim 2.

4. A power supply control system that supplies power from an external power source to an electric vehicle via a charging outlet, A power supply control device that controls the supply of power to the charging outlet, The system includes a ground fault circuit interrupter with overcurrent protection, which is provided between the power supply control device and the charging outlet, and which autonomously shuts off the power supply circuit when a ground fault or overcurrent flows, and has the function of opening and closing the power supply circuit by remote operation, and is provided separately from the power supply control device, When the power supply control device detects a current value greater than or equal to a threshold value smaller than the current value at which the overcurrent protection earth leakage circuit breaker autonomously trips due to leakage or overcurrent, it transmits a tripping command signal to the overcurrent protection earth leakage circuit breaker for remote operation, thereby interrupting the power supply circuit, before the earth leakage circuit breaker autonomously trips due to leakage or overcurrent. Power supply control system.

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