KR100610258B1 - Intelligent earth leakage breaker system - Google Patents

Abstract

The present invention relates to an intelligent power automatic recovery system using an earth leakage circuit breaker with a delayed operation time. More specifically, the earth leakage circuit breaker is configured by an operation delay unit in an earth leakage circuit breaker that cuts off a circuit when an abnormality occurs in a power supply to a power line. By delaying the operating time to within the allowable time according to the rated sensitivity current, check the power supply leakage or overload condition in the intelligent power automatic recovery device before the earth leakage breaker is operated, and detect the short-circuit, overload, It is an intelligent power recovery system that automatically restores power when it is blocked by lightning.

Earth leakage breaker, automatic power recovery device, over current, overload

Description

 Intelligent earth leakage breaker system

 1 is a block diagram of a power supply automatic recovery system of the present invention

 2 is a block diagram of an earth leakage circuit breaker according to the present invention;

 3 is a block diagram of an operation delay unit configured in an earth leakage breaker according to the present invention;

 Figure 4 is an internal configuration of the intelligent power automatic recovery device of the present invention

 Figure 5 is a front panel configuration of the intelligent power automatic recovery device of the present invention

<Signs of Main Parts Drawings>

Magnetic switch (1), lightning protector (2), down transformer (3), power stabilizer (4), signal stability amplifier (5), load current detector (6), earth leakage detector (7), main power controller (8) ), Emergency recovery unit (9), power input / output unit (10,100), main control unit (13), limit selector switch (14), display unit (15), control unit (16), power line (50), current transformer 51, amplifier AMP 52, latch 53, trip coil driver 54, operation delay means 55, resistors R1, R2, R3, capacitors C1, C2, Earth leakage breaker (A), intelligent power automatic recovery device (B)

The present invention relates to an intelligent power automatic recovery system using an earth leakage circuit breaker with a delayed operation time. More specifically, the earth leakage circuit breaker is configured by an operation delay unit in an earth leakage circuit breaker that cuts off a circuit when an abnormality occurs in a power supply to a power line. By delaying the operating time to within the allowable time according to the rated sensitivity current, check the power supply leakage or overload condition in the intelligent power automatic recovery device before the earth leakage breaker is operated, and detect the short-circuit, overload, It is an intelligent power recovery system that automatically restores power when it is blocked by lightning.

Earth Leakage Circuit Breaker (ELB) is a device consisting of an earth leakage detector, an image current transformer, a breaker, etc., and a ground fault current caused by a short circuit or insulation breakdown in metal parts such as metal enclosures or metal shells of electrical machinery and equipment. When is over a certain value, it means to cut off the electric circuit of electric equipment within given time.

The circuit breaker does not operate because the inflow and outflow currents of the current transformer are the same under normal conditions, but in case of ground fault, the inflow and outflow current passing through the current transformer differs by the ground fault current, so it detects this difference and blocks the circuit breaker. Will prevent electric shock.

Since the current value at which a person dies due to electric shock, that is, the ventricular defibrillation current is about 50 to 100 mA (1 second), the circuit breaker operates at a lower value to protect human life from electric shock.

In general, an overcurrent breaker and an earth leakage breaker are installed separately in the low-voltage distribution line, and if an overcurrent exceeding the standard value flows in the line, the overcurrent breaker operates to cut off the power to protect the electric equipment, and if an abnormal current occurs due to lightning, surge, or short circuit, The breaker works to block the converter.

The earth leakage breaker has an electronic earth leakage breaker from a thermal switching element (eg, bimetal) according to an operation method, and has a high sensitivity type and a medium sensitivity type according to the amount of leakage current, that is, a ground fault sensitivity. , High-speed type for demonstration of electric shock protection, demonstration type, and inverse demonstration type.

The high-sensitivity earth leakage breaker has a rated earth leakage current of approximately 30 [mA], and the medium-sensitivity earth leakage circuit breaker has a rated earth leakage current of more than about 50 [mA] and less than 1000 [mA].

The high speed earth leakage breaker has an operating time of less than 0.1 seconds from the detection of the rated earth leakage current, the high speed earth leakage breaker for electric shock protection has an operating time of less than 0.03 seconds from the time of detecting the earth leakage current. This means within 0.1 second to 2 seconds.

The inverse time delay type circuit breaker operates within 0.2 to 1 second when the leakage current is rated leakage current, but operates within 0.1 to 0.5 seconds when 1.4 times the rated leakage current, and within 0.05 seconds when it is 4.4 times the rated current. It is a breaker.

Korean Utility Model Registration No. 20-0257968 has a detection unit for detecting a current value of an electrical circuit to be earth-leakage, and calculates a leakage current value based on the current value detected through the detection unit, and calculates the leakage current value calculated by the user. When the leakage current value is greater than or equal to the set reference value, the earth leakage breaker configured to include a control unit for generating a control signal for opening the electric circuit and a breaker for opening the electric circuit by the control signal generated from the control unit. Listed,

Publication No. 20-0257979 consists of an earth leakage circuit section consisting of an earth leakage test section, an earth leakage detection section, and an amplification section, a driving circuit section, and a power supply section to operate the circuit by pressing the test button of the earth leakage test section or when a certain amount of leakage current is generated in an actual converter. In the ground circuit breaker to cut off, the signal generator which generates the output signal periodically is connected to one end of the ground fault test section, and the comparison signal section for comparing the signal through the ground fault circuit section between the ground fault detection section and the driving circuit section is connected to each end. Since the signal generator and the comparison signal unit are directly connected, the signal comparison unit compares the signal via the earth leakage circuit unit with the signal directly integrated with the signal generation unit. The signal generator sends a periodic repetitive signal to the circuit breaker If the signal from the leakage circuit part to the comparison signal part is blocked or abnormal due to the defect of the leakage circuit part, compare the signal directly input from the signal generation part and generate the output signal to the driving circuit part to trip the circuit breaker by tripping the circuit. Self-diagnostic type earth leakage breaker is characterized in that,

Publication No. 1999-0040071 discloses an abnormality in a line to be supplied with a means for automatically checking whether there is an abnormality in the line to be powered before supplying power, and a means for closing the breaker's movable contact when there is no error. A power circuit breaker with an identification device is described.

However, the circuit breaker as described above does not generate secondary output of the current transformer when the waveform of the power supply is normal. However, when the abnormal waveform is caused by various factors such as lightning, surge, or leakage, the output of the current transformer is generated. Since the bar is recognized as a short circuit, a ground fault interrupter operates even when the short circuit is not.

After the ground fault circuit breaker is operated due to the abnormal current as described above, when the ground fault breaker is solved, it must be returned to its original state to supply power. For this purpose, the ground fault breaker must be returned to the site where the ground fault breaker is installed. If it is installed at a long distance such as a mobile communication repeater installed in a rooftop or a mountainous area, or an unmanned electric device or a street lamp in a street park, it will take a lot of time and effort to return the circuit breaker to its original state. There is a problem such as damage occurs.

In order to solve this problem, the present applicant has developed an intelligent power automatic recovery device that can automatically recover the power cut off by various factors such as temporary lightning, surge, or short circuit, and was registered as Utility Model Registration No. 0285754. .

However, it is a circuit breaker used to prevent electric shocks and electric fires due to leakage currents in low voltage circuits below 600V AC, and earth leakage breakers must be installed in converters that are expected to have a short circuit disaster. Therefore, the intelligent power automatic recovery device and the earth leakage breaker developed by the present applicant should be interlocked with each other, but when the existing earth leakage breaker is installed together with the intelligent power automatic recovery device, when the abnormal power is generated, the earth leakage breaker is first cut off and the intelligent power automatic recovery device Problems occur that can not perform the function of.

The present invention has been made to solve the above problems, by further comprising an operation delay means to the existing earth leakage circuit breaker to cut off the electric current when the power supply to the power line is abnormal, due to lightning, surge or short circuit When the current is generated, the operation delay of the earth leakage breaker is delayed by the operation delay means within the allowable time according to the rated sensitivity current, and the intelligent power automatic recovery device checks the power supply leakage or overload during the operation delay time of the earth leakage breaker. When the abnormal voltage is detected and cut off by temporary short, overload or lightning, the power is automatically restored.In the event of abnormal current caused by lightning, surge or short circuit, the cause is solved by the intelligent automatic recovery device. The operator does not have to visit the site where the circuit breaker is installed To minimize the time before there is a purpose.

The present invention for achieving the above object is for an intelligent power automatic recovery system, in more detail, the operation of the earth leakage circuit breaker by configuring the operation delay means to the circuit breaker to cut off the circuit in case of abnormal power supply to the power line Delay the operation time to within the allowable time according to the rated sensitivity current, and check the short circuit or overload condition of the power line in the intelligent power automatic recovery device before the earth leakage breaker is operated. It is an automatic power recovery system that automatically restores power when shut off.

The present invention includes an image transformer 51 for checking an abnormal current of the power supply line 50, an amplifier (AMP) 52 connected to the image transformer 51 to amplify the checked signal, and the amplifier 52. The amplifier 52 in the existing circuit breaker consisting of a latch (53) connected to the hold (Latch) 53 to maintain a constant amplified signal, and a trip coil driver (54) connected to the latch 53 to cut off electricity. And the latch 53 connected to the trip coil driver 54, and instead, the operation delay means 55 are connected to temporarily delay the current flowing from the amplifier 52 to the trip coil driver 54 when an abnormal current occurs. By delaying the operation time of the trip coil drive unit 54 to cut off the converter, and install the intelligent automatic power recovery device (B) to check the abnormal current while the operation of the earth leakage breaker (A) is delayed Whether it is abnormal current or short circuit The intelligent power will automatically recover the system is configured to automatically cut off and restore power.

The present invention is characterized by delaying the operation time of the earth leakage breaker by the operation delay means to within the allowable time according to the rated sensitivity current by the operation delay means when the abnormal current occurs due to lightning, surge or leakage. The intelligent power recovery system checks the power supply leakage or overload during the operation delay time and detects the input abnormal voltage and automatically restores the power when it is cut off by temporary short, overload or lightning, thereby minimizing the power failure time.

In the present invention, the latch 53 is not actuated, but is unnecessary (must be removed), but since it is already built in an existing device (part), the connection is merely disconnected while leaving the existing product intact for recycling to the present invention. The operation delay means 55 of the present invention is an improvement that can be used by connecting to the trip coil drive unit 54.

As shown in FIG. 3, the operation delay unit 55 of the present invention includes two resistors R1 and R2 connected in series between the amplifier 52 and the trip coil driver 54, and the two resistors R1. The capacitor C1 is connected in parallel between R2 and performs a filter role, and is connected in parallel between the resistor R2 and the trip coil driver 54 to delay the operation time of the trip coil driver 54. The capacitor C2 performs a role and the resistor R3 discharges the capacitance charged in the capacitor C2.

Hereinafter, it will be described based on the accompanying drawings.

1 is a block diagram of an automatic power supply recovery system of the present invention, FIG. 2 is a block diagram of an earth leakage circuit breaker of the present invention, FIG. 3 is a block diagram of an operation delay unit configured in an earth leakage breaker of the present invention, and FIG. 5 is a block diagram showing the front panel of the intelligent power recovery device according to the present invention. The magnetic switch 1, the lightning protection device 2, the down transformer 3, and the power stabilization unit 4 are shown. , Signal stability amplifier (5), load current detection unit (6), earth leakage detection unit (7), main power supply control unit (8), emergency recovery unit (9), power input / output unit (10,100), main control unit (13) , Limit selector switch 14, display unit 15, control unit 16, power supply line 50, current transformer 51, amplifier AMP 52, latch 53, trip coil drive unit ( 54), operation delay means 55, resistors R1, R2, R3, capacitors C1, C2, earth leakage breaker A, and intelligent power supply automatic recovery device B.

In the intelligent power automatic recovery system according to the present invention, as shown in FIG. 1, an earth leakage breaker (A) equipped with an operation delay unit (55) and an intelligent power automatic recovery device (B) are installed in series on a power line 50. When the abnormal current occurs in the power supply line 50 due to lightning or surge, the ground fault circuit breaker A detects the abnormal current through the image current transformer 51 and amplifies it to the amplifier 52, and then delays the operation. The current flow through the means 55 to delay the operating time of the trip coil drive unit 54 by delaying the current within the operating time according to the rated sensitivity current, the intelligent power automatic recovery device (B) is the earth leakage breaker ( While A) is delayed, it is determined by the down transformer 3 and the power stabilizer 4 whether there is an abnormality in the power input to the power input unit 10, and according to the instruction of the main controller 13 in case of abnormality. The main power is controlled by the main power supply control unit 8 Blocked by the location (1) and the main control unit 13 limits the selection switch 14 is considered a secondary predetermined interval and number of attempts recovery, the current limit is set by an instruction from the is configured to attempt to recover.

As shown in FIG. 2, the earth leakage breaker A is configured to amplify the abnormal current detected by the image current transformer 51 and an image current transformer 51 for monitoring whether an abnormal current is generated in the power supply line 50. Operation delay means 55 for delaying the operation time of the trip coil drive unit 54 by storing the amplifier amplified from the amplifier 52 and the amplifier 52, and the operation delay means 55 is connected to a constant The trip coil driver 54 cuts off the electric current when the current is induced.

As shown in FIG. 3, the operation delay means 55 includes two resistors R1 and R2 connected in series between the amplifier 52 and the trip coil driver 54, and the two resistors R1 and R2. ) Is connected in parallel between the capacitor (C1) to perform a filter role, and in parallel between the resistor (R2) and the trip coil driver 54 to serve to delay the operation time of the trip coil driver 54. And a resistor R3 for discharging the capacitance charged in the capacitor C2.

The circuit breaker A as described above is detected by the image detector 51 by the occurrence of an abnormal current, and the current amplified by the amplifier 52 is charged in the capacitor C2 of the operation delay means 55, thereby condensing the capacitor. The operation time of the trip coil driver 54 is delayed by the time charged in the C2. Therefore, the operation time of the earth leakage breaker A for blocking the converter is delayed.

The resistance and capacitor values configured in the operation delay means 55 are determined according to the type of the earth leakage breaker. That is, an appropriate resistor and a capacitor may be configured so that the operation is delayed to within the range of the operation time according to the rated sensitivity current of the earth leakage breaker.

As shown in Figure 4, the intelligent power automatic recovery device (B), a power supply line connecting the power input / output unit 10,100 to the power input / output, and the power input / output unit (10, 100) Magnetic switch (1) is formed in the power supply via the power input unit 10 to turn on / off, and connected to the power supply line in the event of a controller abnormality to supply the load side power to the power output unit 100 A recovery unit 9, a lightning protection device 2 connected to the power input unit 10 to remove lightning strikes and surges, and a down voltage connected to the power input unit 10 to lower a voltage to supply power to a controller. A power stabilizer (4) for converting the AC power (voltage) output from the transformer (3) and the down transformer (3) into a DC power (voltage) and supplying stable power to a control unit, and the power stabilizer (4), selector limit switch (14), control panel (16), ground fault A main controller 13 for detecting a signal input through the output unit 7, the load current detector 6, and the signal stability amplifier 5 to control the main power control unit 8 and the display unit 15; A signal detected by monitoring a short-circuit state of the load power connected to the main power control unit 8 and the power output unit 100 that turn on / off the magnetic switch 1 according to a control signal of the control unit 13 Is connected to the ground fault detecting unit 7 for transmitting the main control unit 13 to the main control unit 13, the load current detecting unit 6 for monitoring (sensing) the load current, and the load current detecting unit 6; A signal amplification unit 5 amplified and transmitted to the main control unit 13 to amplify the detected signal and connected to the main control unit 13, and attempts to recover when the magnitude and abnormality of the input current according to the use environment It is connected to the main control unit 13 and the limit select switch 14 for setting the time and the number of recovery, the user Is and the operation unit 16 is configured to operate directly from an external operation, is connected to the main control section 13 consists of an operating state to the display part 15 is configured so that the user can recognize from the outside,

The magnetic switch (1) is directly controlled by the phototriac of the main power supply control unit (8), the spark skeleton is installed to prevent the circuit error due to alternating current and surge, and the main control unit (13) is designed by programming using a microcomputer The signal detected using the coat lance (CT) of the load current detection unit 6 is classified into 256 steps (multi-steps) by the main control unit 13 to digitize to increase the accuracy, and to display the load current and the number of failures display unit 30. It is a device shown in.

The various switches and lamp functions and displays installed in the front portion of the intelligent power automatic recovery device (B) are briefly shown as follows.

division function Display IN Lights up when entering phase green OUT Lit in normal operation of ELB green START Lights up for automatic and manual recovery green Blink during recovery preparation after alarm issuance green STOP On when alarm is generated and manual shutoff Red CUR.SET Lights up when checking current yellow Current display on the numeric panel in normal operation FND blinks COUNTER Number of faults caused by power failure, short circuit and over current FND lights up RESET In normal operation, the numeric keypad returns to "00" for 3 seconds. FND lights up BY PASS Emergency Recovery from ELB Disorder ON, OFF CONCENT Other Meters Used Power NFB ON, OFF TERMINAL Phase I / O Terminal Terminals

In general, the magnetic switch (1) operates by connecting a phase power supply (AC 220V) to the input, and the input and output lamps of the power input display (21) and the power output display (22) turn on as outputs. After the normal circuit is configured, press the Stop button (27) to cut the output and connect the load. Then, press the Start button (26) to apply power to the load. And press the view button 28 to display the "number" to recognize the current use load, turn the control switch on the front control section to adjust the recovery interval, frequency, current value according to the local.

At this time, when the load is changed, the load current and the view button 28 are pressed to indicate the "number" value to cope with the load change, and the reset of the number of trips is performed by pressing the fault display return button 29 for 3 seconds to "00". To use it.

Looking at the operation of the intelligent power supply automatic recovery system according to the present invention, when the normal current flows in the power line 50, the magnetic flux generated in the image transformer 51 of the ground fault circuit breaker (A) cancel each other and do not generate current The earth leakage breaker A is not operated, and the intelligent power automatic recovery device is also not operated.

When an abnormal current occurs in the power supply line 50 due to a lightning strike or a surge, the abnormal current measured by the image current transformer 51 of the earth leakage breaker A is amplified by the amplifier 52 and then the operation delay means 55. It is moved to and filtered by the resistor (R1) and the capacitor (C1) is passed through the resistor (R2) to be charged in the capacitor (C2). Therefore, the trip coil driver 54 operating by the flow of the current is delayed while the current flowing into the operation delay means 55 is charged in the capacitor C2.

If the amount of current to be charged exceeds the capacity of the capacitor C2, the current output from the amplifier 52 is moved to the trip coil driver 54 so that the trip coil driver 54 is operated to convert the current. Will be blocked.

The intelligent power automatic recovery device (B) is operated while the earth leakage breaker (A) is delayed by the operation delay means (55), and the power supply of the abnormal current to the power input unit (10) through the lightning protector (2). When the power supply is protected against high voltage and judged to be abnormal by the down transformer (3) and the power stabilizer (4), the main power control unit (8) according to the instruction of the main control unit (13) supplies the phase power to the magnetic switch (1). Is blocked by.

When the cause of the abnormal current is eliminated by the intelligent power automatic recovery device (B) is discharged the current charged in the capacitor (C2) by the resistor (R3) configured in the operation delay means 55 of the earth leakage breaker (A), The operation delay means 55 is initialized.

Referring to the operation of the intelligent power automatic recovery device (B) in more detail,

In normal operation, ON / OFF operation can be done by pressing the STOP button 27 while the green lamp is on and the timer display unit 23 and the alarm and fault OFF indication by the instruction of the main control unit 13 ( 24) is displayed in red and the load is turned OFF.

Manual alternating motion test is performed using the START button (26) and the STOP button (27).

When the abnormal voltage and lightning flows in, the power inputted to the power input unit 10 is protected against high voltage through the lightning protector 2 and is judged to be abnormal by the down transformer 3 and the power stabilizer 4. In accordance with the instruction of the control unit 13, the phase power source is cut off by the magnetic switch 1 by the main power source control unit 8.

The signal detected by the ground fault detecting unit 7 and the load current detecting unit 6 when the ground fault and overload phenomenon occurs is judged by the signal safety amplifier 5 and the main power control unit according to the command of the main control unit 13. The magnetic switch 1 is cut off by (8).

Auto-recovery is the main control unit when the green lamp flashes on the device operation and timer display unit 23 together with the red lamp on the alarm and fault OFF display unit 24 for the fault caused by momentary power failure, lightning, overload, or short circuit. At (13), the auxiliary instruction of the limit select switch 14 attempts to recover in consideration of the predetermined interval, the recovery attempt count, and the set current limit value.

The restoring operation of the main control unit 13 by the limit selector switch 14 is performed within the cut-off speed and determines the ON / OFF state detection during that time.

Manual recovery attempts forced recovery by pressing the START button 26 when the red lamp is turned on in the alarm and fault OFF display section 24 and the green lamp flashes on the operation and timer display section 23 of the device.

When the intelligent automatic power recovery device operates by a normal load, the operating current monitor presses the load current view button 28 so that a yellow lamp lights up on the load current check display unit 25 and the load current and fault count display unit 30 is displayed. Flashes with numbers in the display.

The error count display and recovery is indicated by adding a number to the load current and the error count display part 30 when the load power failure due to a fault and a short circuit due to an error of the power supply or a fault occurs. Since the button 29 is pressed for 3 seconds or longer, it is initialized.

   The present invention as described above constitutes an operation delay means for an earth leakage breaker that cuts off the electric current when an abnormality occurs in the power supplied to the power line, thereby delaying the operation time of the earth leakage breaker to within an allowable time, and providing intelligent power during the operation delay time of the earth leakage breaker Automatic recovery device checks the power supply leakage or overload condition and detects the input abnormal voltage and automatically restores the power when it is cut off by temporary short, overload or lightning. The cause is solved by the automatic power recovery device, and the electric equipment operator does not have to directly visit the site where the earth leakage breaker is installed, and it has the effect of minimizing the time of power failure due to temporary abnormal current.

Claims (4)

In the intelligent power automatic recovery system, an earth leakage breaker (A) having an operation delay means (55) and an intelligent power automatic recovery device (B) are constructed by installing them in series on a power line (50), and the earth leakage breaker (A ) Detects an abnormal current through the image transformer 51 and amplifies the amplifier 52 when an abnormal current occurs in the power supply line 50 due to a lightning strike or surge, and then flows the current through the operation delay unit 55. It is configured to delay the operation time of the trip coil drive unit 54 by delaying the operation time according to the rated sensitivity current, The intelligent power automatic recovery device (B) is determined by the down transformer (3) and the power stabilizer (4) whether the power input to the power input unit 10 is abnormal while the earth leakage breaker (A) is delayed in operation. Therefore, in case of abnormality, the main power is blocked by the magnetic switch 1 by the main power control unit 8 according to the instruction of the main control unit 13, and the auxiliary instruction of the limit selection switch 14 is changed by the main control unit 13. Intelligent power automatic recovery system, characterized in that configured to attempt to recover in consideration of a predetermined interval, the number of recovery attempts, and the set current limit. According to claim 1, wherein the circuit breaker (A) is an image transformer 51 for monitoring whether an abnormal current of the power supply line 50 is generated, and an amplifier for amplifying the abnormal power detected by the image transformer 51 ( 52 and an operation delay unit 55 for storing the current amplified from the amplifier 52 to delay the operation time of the trip coil driver 54, and a constant current connected to the operation delay unit 55. The trip coil driver 54 cuts off the circuit during induction, and the current detected by the current transformer 51 and amplified by the amplifier 52 is charged in the condenser C2 of the operation delay unit 55. Intelligent power automatic recovery system, characterized in that configured to delay the operation time of the earth leakage breaker (A) to cut off the electric current by delaying the operation time of the trip coil drive unit 54 by the time charged in the capacitor (C2). The method of claim 2, wherein the operation delay means 55 is connected between the two resistors (R1, R2) and the two resistors (R1, R2) connected in series between the amplifier 52 and the trip coil driver 54. Is connected in parallel to the capacitor (C1) to perform a filter role, and is connected in parallel between the resistor (R2) and the trip coil driver 54 to serve to delay the operation time of the trip coil driver (54) Intelligent power automatic recovery system, characterized in that consisting of a capacitor (C2), and a resistor (R3) for discharging the electric charge charged in the capacitor (C2). According to claim 1, wherein the intelligent automatic power recovery device (B) is formed on the power supply line connecting the power input / output unit 10,100 to the power input / output, and the power input / output unit (10, 100) Magnetic switch 1 for turning on / off the power supplied through the power input unit 10 and an emergency recovery unit connected to the power supply line to supply the load side power to the power output unit 100 in case of a controller failure. (9), a lightning protection device (2) connected to the power input unit (10) to remove lightning and surges, and a down transformer (10) connected to the power input unit (10) to lower a voltage to supply power to a controller ( 3), a power stabilization unit 4 for converting AC power (voltage) output from the down transformer 3 into DC power (voltage) and supplying stable power to a control unit, and the power stabilization unit 4 Limit selector switch (14), control panel (16), earth leakage detector (7) And a main controller 13 for sensing a signal input through the load current detector 6 and the signal stability amplifier 5 to control the main power controller 8 and the display unit 15, and the main controller 13. The main power control unit 8 for turning on / off the magnetic switch 1 according to a control signal of the control unit; and monitoring a short circuit of the load power connected to the power output unit 100 to detect a signal detected by the main control unit. A signal detected by the load current detection unit 6 connected to the earth leakage detecting unit 7 to be transmitted to the unit 13, a load current detection unit 6 for monitoring (sensing) the load current, and the load current detection unit 6; The signal stability amplifier 5 amplified and delivered to the main control unit 13 and the main control unit 13 are connected to the main control unit 13, and the magnitude of the current inputted according to the use environment, recovery attempt time and recovery frequency in case of abnormality. It is connected to the limit selection switch 14 and the main control unit 13 to be set, the user wants Intelligent power automatic recovery system comprising a control unit 16 configured to directly operate the work from the outside, and a display unit 15 connected to the main control unit 13 and configured to recognize the operation state from the outside. .

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