KR101029569B1 - Circuit breaker improves the breaker break time when instantaneous current occurs - Google Patents

Abstract

The present invention relates to a circuit breaker in which a trip operation time is shortened when an instantaneous current flowing in an electric line is generated instantaneously when an overcurrent or a short circuit occurs. More specifically, the present invention relates to a circuit breaker further configured with an instantaneous current sensing circuit that operates only when an instantaneous current is generated.

The present invention provides a circuit breaker for interrupting load power when an instantaneous current is generated, comprising: a rectifier circuit for full-wave rectifying the power flowing through the current transformer to the circuit breaker; A zener diode for supplying a control voltage of a constant voltage from the power rectified by the rectifier circuit; A transistor 240 receiving a reverse current of a zener diode conducting at a predetermined voltage or higher and energizing the rectified power through the rectifying circuit; A CPU which is driven by being supplied with a constant voltage control power through V Zener diode, and detects a voltage signal of the power supplied through the transistor 240 and outputs a trip signal when an overvoltage occurs; A transistor 700 through which the trip signal is applied through the CPU so that the power rectified by the rectifier circuit is energized; A trip coil driven by a voltage applied when the transistor 700 is energized; And an instantaneous current sensing circuit unit for detecting a voltage signal energized through the transistor 240 and applying a trip signal to the transistor 700 only when the magnitude of the detected voltage exceeds a reference voltage. We propose a circuit breaker that improves the breaker break time when

Through the circuit breaker according to the present invention, when an instantaneous current is generated, the trip time can be greatly shortened to 0.88 ms to 1.56 ms. There is an effect that can be prevented.

In addition, it is possible to reliably determine that the cause of instantaneous waveform is caused by overcurrent corresponding to 14 times of the rating, and prevent malfunction and burn coil burnout caused by voltage applied to the trip coil due to instantaneous noise. The instantaneous current detection circuit portion having the function of having a function can be configured in the circuit breaker.

Instantaneous current, circuit breaker, comparator, pulse width comparator, trip coil

Description

The circuit braker having function for shorting the trip time when over current happens}

The present invention relates to a circuit breaker in which a trip operation time is shortened when an instantaneous current flowing in an electric line is generated instantaneously when an overcurrent or a short circuit occurs.

More specifically, the present invention relates to a circuit breaker further configured with an instantaneous current sensing circuit that operates only when an instantaneous current is generated.

The over current, overload, short circuit, etc. generated in the electric line may cause damage caused by fire, equipment damage, or human injury. In order to prevent this, a circuit breaker is installed in the distribution panel in the building to cut off the current flowing into the load when an overcurrent is generated.

The greatest capability of these breakers lies in their ability to cut off electricity safely and at high speeds. However, the breakdown times of domestic and international breakers up to now are on average 10ms ± 2ms, and since these breakdown times are relatively long to prevent accidents, they are inadequate for the protection of the load and human body during the breaker trip time. It is caused by.

1 is a circuit configuration diagram of an electronic circuit breaker for blocking a conventional instantaneous current, which will be described with reference to the drawings. Instantaneous current means a transient current flowing through an electric line instantaneously when an overcurrent or short circuit current occurs.

The current flowing through the current transformer 10 is rectified through the rectifier circuit 20 to apply the Vcc voltage to the CPU 40 through the diode 30, the CPU is applied to the control power supply to operate the Vcc voltage. .

At this time, when overcurrent occurs, the zener diode 50 is turned on when a voltage exceeding the set breakdown voltage is generated so that the constant voltage Vcc is applied to the CPU, and the zener voltage is applied as a bias voltage to the base of the transistor 60. As the transistor is energized, the current rectified in the rectifier circuit flows through the transistor.

At this time, the current flowing through the transistor 60 is input to the CPU 40 to determine whether overcurrent and instantaneous peak current are generated by a processor built in the CPU, and when it is determined that the overcurrent is generated, it is fixed by a built-in timer. After a time elapses, a trip signal is applied to the transistor 70 as a bias voltage, and as the transistor 70 is energized, a voltage is applied to the solenoid coil 80 to drive the trip device of the circuit breaker.

However, as shown, in the case of the conventional circuit breaker, since the C1 capacitor 90 included in the charging circuit for DC power supply, the C2 capacitor 100 for the CPU reset circuit 110, etc. are essentially included, The breaker will include a trip delay element.

In practice, the C1 capacitor 90 has a delay time of 0.3 m or less when a short circuit current occurs, and the C2 capacitor 100 has a delay time of 1 to 2 ms.

In addition, when using an electronic circuit breaker through a process built into the CPU, the CPU reset and interface initialization delay time caused by the residual voltage charged in the delay element of the CPU itself has a delay time of about 6 ms. Therefore, when a short circuit current actually occurs, a time delay of 7 to 8 ms occurs.

In particular, when the start point of the AC current, which is a short circuit current, is a zero point, an additional delay time of 1 to 2 ms may occur, and the trip delay time may be increased to a maximum of about 8 to 10 ms.

Therefore, since the trip time becomes longer when a transient current such as instantaneous current occurs with the conventional electronic circuit breaker, the problem is that the conventional circuit breaker cannot be a proper solution in the event of a short circuit accident. It is becoming.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a circuit breaker which greatly shortens the breaking time of a breaker in case of instantaneous current is generated.

In addition, an object of the present invention is to provide a circuit breaker including an instantaneous current detection circuit that operates only when a large voltage of a predetermined multiple of the rated voltage is generated, such as when an instantaneous current is generated.

In addition, it is possible to reliably determine that the cause of instantaneous waveform is caused by overcurrent corresponding to 14 times or more of the rating, and prevent malfunction and burn coil damage caused by voltage applied to the trip coil due to instantaneous noise. It is an object of the present invention to provide a circuit breaker including an instantaneous current sensing circuit portion having a function capable of.

In order to achieve the above object, the present invention provides a circuit breaker for interrupting the load power when the instantaneous current occurs, the rectifier circuit for full-wave rectifying the power flowing through the current transformer to the circuit breaker; A zener diode for supplying a control voltage of a constant voltage from the power rectified by the rectifier circuit; A transistor 240 receiving a reverse current of a zener diode conducting at a predetermined voltage or higher and energizing the rectified power through the rectifying circuit; A CPU which is driven by being supplied with a constant voltage control power through V Zener diode, and detects a voltage signal of the power supplied through the transistor 240 and outputs a trip signal when an overvoltage occurs; A transistor 700 energizing the rectified circuit in the rectifier circuit while a trip signal is applied through the CPU; A trip coil driven by a voltage applied when the transistor 700 is energized; And an instantaneous current sensing circuit unit for detecting a voltage signal energized through the transistor 240 and applying a trip signal to the transistor 700 only when the magnitude of the detected voltage exceeds a reference voltage. The circuit breaker that shortens the breaker time at the time of occurrence is presented.

The instantaneous current detection circuit unit, an amplifier for detecting and amplifying the voltage signal energized through the transistor 240; And a comparator configured to receive a voltage signal amplified by the amplifier and output a trip signal to the transistor 700 by comparing with a set reference voltage.

The zener diode may be configured to set a reference voltage to the comparator.

The reference voltage set in the instantaneous current sensing circuit unit may be set to a predetermined multiple of the rated voltage, and the reference voltage may be set to 14 times or more of the rated voltage.

In addition, the instantaneous current detection circuit unit, a sense resistor for detecting a voltage signal by sensing the current supplied through the transistor 240; An amplifier for receiving and amplifying the voltage signal detected by the sense resistor; A DC converter converting the voltage signal amplified by the amplifier to a DC level by removing noise components; A first comparator for outputting an output signal generated when the voltage converted by the DC converter to the reference voltage to the transistor 700 as a trip signal; A second comparator for generating an output signal by filtering only a signal corresponding to an instantaneous waveform from the voltage signal amplified by the amplifier; And a pulse width comparator for controlling the output signal generated by the first comparator according to the output signal generated by comparing the pulse width of the output signal received from the second comparator with a preset reference pulse width. Can be.

The reference pulse width of the pulse width comparator may be set to 1 ms, and when the output signal of the pulse width comparator is at a LOW level, the output signal generated by the first comparator cancels the output terminal of the pulse width comparator through a diode. It may be configured to.

In addition, when the output signal of the pulse width comparator is at the HIGH level, the output signal generated by the first comparator may be configured to be applied to the transistor.

When the instantaneous current according to the present invention is generated, the following effects can be obtained through a circuit breaker that improves the breaking time of the breaker.

First, when instantaneous current occurs, the trip time can be greatly shortened to 0.88ms ~ 1.56ms, which can prevent fire, load breakage, and human accidents caused by delayed breaker trip time. have.

Second, the breaker is equipped with a comparator that sets a voltage equal to or more than a predetermined multiple of the rated voltage as a reference voltage, and generates a trip signal from the instantaneous current sensing circuit only when the reference voltage is exceeded, while maintaining the performance of the existing circuit breaker. It will have the effect of enhancing the instantaneous blocking function.

Third, unlike the method in which a trip signal is generated by programming through a process embedded in the CPU of the conventional electronic circuit breaker, the instantaneous current detection circuit part of the present invention is implemented in an analog method, and therefore, is resistant to noise, and the CPU itself. The CPU reset and interface initialization delay time caused by the residual voltage charged in the delay element of the internal circuit can be reduced, which greatly reduces the interruption time.

Fourthly, the cause of instantaneous waveforms is caused by overcurrent that is 14 times higher than the rated value, and reliably judges that malfunction and tripping of trip coil caused by voltage is applied to trip coil due to instantaneous noise. The instantaneous current detection circuit unit having a function of preventing can be configured in the circuit breaker.

With reference to the accompanying drawings, a circuit breaker which shortens the breaking time of the breaker when the instantaneous current is generated according to the present invention will be described in detail.

2 is a block diagram of a circuit breaker that shortens the breaker time when the instantaneous current is generated according to the present invention, and FIG. 3 is a shortened breaker time of the breaker when the instantaneous current is generated according to the first embodiment of the present invention. A circuit configuration diagram of a circuit breaker.

Referring to the present invention, the present invention includes a rectifier circuit 100, a power generation circuit unit 200, a charging circuit unit 300, a CPU 400 including an OCR (Over Current Relay) circuit, an instantaneous current detection circuit unit 500, The trip coil 600 and the transistor 700 are configured to be included.

When the three-phase voltage transformed by the current transformer CT is applied to the power generation circuit unit 200 through each rectifier circuit 100, and the input voltage is less than the reference voltage (breakdown voltage) of the zener diode 220. The Zener diode 220 is supplied with a Vcc control voltage to the CPU 400 through the charging circuit unit 300 without being turned on.

The charging circuit unit 300 converts the power input to the CPU 400 into a DC power to be input.

If an over-current or a short-circuit current occurs in the three-phase current to generate an overvoltage above the set reference voltage of the zener diode 220, the zener diode 220 is turned on to conduct the transistor 240 to the zener diode 220. The reverse current is applied as a bias current and turned on.

At this time, the power rectified through the rectifier circuit 100 flows through the transistor 240.

In the CPU 400 including the OCR (Over Current Relay) circuit, when an overvoltage occurs, a constant voltage control power is supplied to Vcc through the zener diode 220 to be driven, and energized through the transistor 240. The voltage signal of the power supply is detected to output a trip signal when an overvoltage occurs.

The CPU 500 includes an OCR circuit that generates a trip signal when an overcurrent occurs, and includes a process programmed by a microcomputer, an MPU, and the like, and calculates an overvoltage according to a set process to generate a trip signal. Will print.

As the trip signal output through the CPU 500 is applied to the transistor 700 as a bias voltage, the transistor 700 is turned on and the power rectified by the rectifier circuit 100 is energized to the transistor 700.

When the transistor 700 is energized, a voltage is applied to the trip coil 600 to open the contacts of the circuit breakers of each phase to cut off the power flowing to the load.

In addition, in the case of the circuit breaker according to the present invention, an instantaneous current detection for detecting a voltage signal energized through the transistor 240 and applying a trip signal to the transistor 700 only when the detected voltage is greater than or equal to a set reference voltage. The circuit part 500 is further comprised.

The instantaneous current detection circuit unit 500 receives an amplifier 520 for detecting a voltage signal energized through the transistor 240 and amplifies the detected signal and a voltage signal amplified through the amplifier 520. And a comparator 540 for outputting a trip signal to the transistor 700 when an input equal to or higher than a reference voltage is generated.

The comparator 540 may be configured with a zener diode 560 to set a reference voltage compared with the input voltage.

The reference voltage set in the comparator 540 of the instantaneous current detection circuit unit 500 may be set to a predetermined multiple of the rated voltage. Preferably, the reference voltage set in the comparator is set to 14 times or more of the rated voltage.

Hereinafter, the operation principle of the circuit breaker which shortened the interruption time of a circuit breaker when instantaneous current generate | occur | produces is demonstrated in detail.

The reference voltage set in the comparator 540 of the instantaneous current detection circuit unit 500 is set to 14 times the rated voltage.

4A is an operation state diagram of a circuit breaker in a state in which an overvoltage of less than the reference voltage set in the comparator according to the first embodiment of the present invention is generated, and FIG. The operation state diagram of the circuit breaker in the state of overvoltage is shown.

As shown in FIG. 4A, when an overcurrent or short circuit current is generated inside the circuit breaker, when a voltage equal to or greater than the reference voltage of the zener diode 220 is input, the zener diode 220 is turned on to turn the reverse current into the transistor 240. Transistor 240 is energized while current is applied as a bias.

When an overcurrent occurs, the CPU 500 is driven by being supplied with a constant voltage Vcc through the zener diode 220 and detects a current flowing through the transistor 240 to receive and input an overcurrent through a built-in programmed process. Will be detected.

When the CPU 500 determines that an overcurrent has occurred, a trip signal is output through an OCR circuit, and a bias voltage is applied to the transistor 700 so that the transistor 700 is energized and a voltage is applied to the trip coil 600, thereby providing a breaker circuit. The contact will open.

In addition, the instantaneous current detection circuit unit 500 detects and amplifies a voltage signal from the current supplied through the transistor 240 in parallel with the input of the current flowing through the transistor 240 to the CPU 400. 540).

However, since an instantaneous current is not actually detected in a state in which an overvoltage below the reference voltage set in the comparator 540 is generated, a trip signal is not output to the transistor 700.

However, in the electronic circuit blocking method through the CPU 400, noise is inevitably generated according to the DSP of the CPU 400, and the CPU reset and interface initialization generated due to the residual voltage charged in the delay element of the internal circuit of the CPU itself. This will involve delays in the process.

This is not a problem especially when an overcurrent corresponding to only a few times the rated voltage is generated. However, when an instantaneous current is generated and a voltage larger than the rated voltage is applied, the interruption time delay caused by such a circuit breaker is immediately a major accident. Will continue.

In order to improve this, as shown in FIG. 4B, in the state where an overvoltage higher than the reference voltage set in the comparator is generated, the voltage of the voltage input to the comparator 540 is greater than or equal to the reference voltage so that the transistor 700 may be connected through the comparator 540. The transistor 700 is energized while the low bias voltage is applied, and a voltage is applied to the trip coil 600 to open the contact of the circuit breaker.

That is, when instantaneous current is generated and an instantaneous current of 14 times or more of the rated voltage is generated, the instantaneous current sensing circuit unit 500 turns on the transistor 700 by an analog circuit method without the control of the CPU 400. A voltage is applied to the circuit 600 to open the contact of the circuit breaker.

Of course, in parallel with the CPU 400, a trip signal is output through the OCR circuit, and a bias voltage is applied to the transistor 700, so that the transistor 700 is energized and a voltage is applied to the trip coil 600, thereby contacting the breaker. It is configured to open.

However, even when the voltage is applied to the trip coil 600 by turning on the transistor 700 in parallel through the CPU 400 and the instantaneous interrupt detection circuit unit 500, the difference in the interruption time is actually the instantaneous interrupt detection circuit unit 500. ) Reduces the interruption time.

In practice, when the instantaneous current is generated through the circuit breaker of the present invention, when the constant voltage output voltage of the zener diode 220 to the CPU 400 is set to 24 V, the trip time is 0.88 ms to 1.56 ms. The current sensing circuit unit 500 has the effect of greatly shortening the trip time of 10ms ± 2ms of the conventional circuit breaker, which is not configured.

If the trip time is about 0.88ms, it means a much faster cut-off time than 16.6ms, which is the period of rated voltage (60Hz) in Korea, so that the cut-off time can be greatly shortened.

As a result, the circuit breaker according to the present invention does not exceed the set reference voltage in the comparator 540 even if overcurrent occurs, and thus the instantaneous current detection circuit unit 500 does not output a trip signal. The transistor 700 is turned on to drive the trip signal 600 by outputting a trip signal only when a voltage greater than or equal to a voltage is applied.

In other words, the instantaneous current detection circuit unit 500 of the present invention applies a voltage to the trip coil 600 by applying a trip signal to the transistor 700 only when the instantaneous current is generated while detecting the instantaneous current, thereby contacting the breaker. It is characterized in that it is configured to block in the shortest time.

5 is a configuration diagram of an instantaneous current detection circuit unit having an improved break time of a circuit breaker when an instantaneous current is generated according to a second embodiment of the present invention.

Referring to FIG. 5, the instantaneous current detection circuit unit 800 senses a current applied through the transistor 240 to sense a voltage signal, and detects a voltage signal, and detects the voltage signal detected by the sense resistor 810. The amplifier 820 for receiving and amplifying the signal, the DC converter 830 for converting the voltage signal amplified by the amplifier 820 to a DC level by removing noise components, and the voltage converted by the DC converter 830 A first comparator 840 for outputting an output signal generated when the reference voltage is greater than or equal to the transistor 700 is included as a trip signal.

In addition, the instantaneous current detection circuit unit 800 through the amplifier 820 in order to accurately determine the occurrence of overcurrent of 14 times or more of the rating through a good quality signal removed noise from the sensing current to prevent malfunction. A second comparator 850 for generating an output signal by filtering only a signal corresponding to an instantaneous waveform from the amplified voltage signal, a pulse width of an output signal received from the second comparator 850, and a predetermined reference pulse width; The pulse width comparator 860 is configured to control the output signal generated by the first comparator 840 according to the output signal generated by comparison.

6A is a diagram illustrating an operating state of a circuit breaker when the output signal of the pulse width comparator according to the second embodiment of the present invention is in a high level state.

When the overcurrent waveform of 14 times or more of the rating is input from the sense resistor 810, the amplifier 820 amplifies about 20 times and removes the noise component from the amplified signal. When the mixed waveform is smoothed by RC integration to a DC level, and it is determined that more than 14 times of overcurrent is generated compared to the reference voltage of the first comparator 840, the first comparator 840 sets the output signal to HIGH level. Generate.

However, the output signal generated by the first comparator 840 may be a dangerous signal because it outputs an output signal by comparing whether it corresponds to an overcurrent of 14 times or more once the noise is not completely removed.

Therefore, in order to check whether the output signal of the first comparator 840 is determined by comparing only a high-quality signal without noise, that is, a level corresponding to overcurrent, the voltage signal amplified by the amplifier 820 may be removed. The second comparator 850 is inputted, and the second comparator 850 filters only the signal corresponding to the instantaneous waveform from the voltage signal to generate an output signal.

In more detail, when the voltage signal amplified by the amplifier 820 is input to the second comparator 850, only the overcurrent waveform of 14 times or more of the rating is filtered by the preset reference voltage to output the pulse.

Next, the pulse width comparator 860 is output from the second comparator 850 and the first comparator 840 according to the output signal generated by comparing the pulse width of the received output signal with a predetermined reference pulse width. It controls the output signal generated from.

Preferably, the reference pulse width of the pulse width comparator 860 may be set to 1 ms and may be set to the second comparator by generating a signal having a reference pulse width through a differential scanning calorimeter (DSC).

As shown in FIG. 6A, when the pulse width comparator 860 has a reference pulse width of 1 ms, the pulse width of the output signal output from the second comparator 850 and received is 1 ms or more. Is determined, the pulse width comparator 860 generates a HIGH level as an output signal, and in this case, outputs the output signal generated by the first comparator 840 to the transistor 700 as a trip signal. do.

6B is an operation state diagram of a circuit breaker when the output signal of the pulse width comparator according to the second embodiment of the present invention is in a low level state.

As shown in the drawing, if the pulse width comparator 860 has a reference pulse width of 1 ms, when the pulse width of the output signal output from the second comparator 850 is less than 1 ms, an overcurrent of 14 times or more is rated. In this case, the pulse width comparator 860 generates a low level as an output signal. In this case, the output signal generated by the first comparator 840 is not output to the transistor 700 as a trip signal. It is not configured to cancel the output terminal of the pulse width comparator 860 through the diode 870.

That is, it is possible to reliably determine that the cause of the instantaneous waveform is caused by overcurrent corresponding to 14 times or more of the rating, thereby preventing malfunction caused by voltage applied to the trip coil due to instantaneous noise. The instantaneous current detection circuit unit 800 having a function of preventing trip coil burnout generated can be configured in the circuit breaker.

In the detailed description of the present invention, as shown, the CT current transformer is configured as a three-phase circuit breaker through which three-phase conduction current flows, based on the secondary side of the CT current transformer, but the technical configuration of the present invention can be applied to not only three-phase but also single-phase. It will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention.

1 is a circuit configuration diagram of an electronic circuit breaker for blocking a conventional instantaneous current.

2 is a block diagram of a circuit breaker to improve the break time of the breaker when the instantaneous current is generated according to the present invention.

3 is a circuit diagram illustrating a circuit breaker in which a breaker time of a breaker is improved when an instantaneous current is generated according to the first embodiment of the present invention.

4A is an operation state diagram of a circuit breaker in a state in which an overvoltage below a reference voltage set in a comparator according to the first embodiment of the present invention is generated.

4B is a diagram illustrating an operating state of a circuit breaker in a state in which an overvoltage higher than a reference voltage set in the comparator according to the first embodiment of the present invention is generated.

5 is a circuit diagram illustrating a circuit breaker in which a breaker time of a circuit breaker is improved when an instantaneous current is generated according to a second embodiment of the present invention.

6A is a diagram illustrating an operating state of a circuit breaker when the output signal of the pulse width comparator according to the second embodiment of the present invention is in a high level state.

6B is an operation state diagram of a circuit breaker when the output signal of the pulse width comparator according to the second embodiment of the present invention is in a low level state.

* Explanation of symbols for main parts of drawing

100: rectifier circuit 200: power generation circuit

220: zener diode 240: transistor

300: charging circuit 400: CPU

500, 800: instantaneous current detection circuit 520: amplifier

540: comparator 560: zener diode

600: trip coil 700: transistor

810: sense resistor 820: amplifier

830: DC converter 840: first comparator

850: second comparator 860: pulse width comparator

870: diode

Claims (9)

In the circuit breaker to cut off the load power when instantaneous current occurs, A rectifier circuit for full-wave rectifying power flowing through the current transformer to the circuit breaker; A zener diode for supplying a control voltage of a constant voltage from the power rectified by the rectifier circuit; A transistor 240 receiving a reverse current of a zener diode conducting at a predetermined voltage or higher and energizing the rectified power through the rectifying circuit; A CPU which is driven by being supplied with a constant voltage control power through V Zener diode, and detects a voltage signal of the power supplied through the transistor 240 and outputs a trip signal when an overvoltage occurs; A transistor 700 through which the trip signal is applied through the CPU so that the power rectified by the rectifier circuit is energized; A trip coil driven by a voltage applied when the transistor 700 is energized; And An instantaneous current sensing circuit unit for detecting a voltage signal energized through the transistor 240 and applying a trip signal to the transistor 700 only when the detected voltage is greater than or equal to a reference voltage. Circuit breaker with short circuit breaker time. The method of claim 1, wherein the instantaneous current detection circuit unit, An amplifier for detecting and amplifying a voltage signal applied through the transistor 240; And And a comparator configured to receive a voltage signal amplified by the amplifier and to output a trip signal to the transistor 700 by comparing with a set reference voltage. 3. The method of claim 2, And a zener diode configured to set a reference voltage to the comparator, wherein the circuit breaker shortens the breaking time of the breaker when the instantaneous current is generated. The method according to any one of claims 1 to 3, And a reference voltage set in the instantaneous current sensing circuit unit is set to a predetermined multiple of the rated voltage. The method of claim 4, wherein And the reference voltage is set to 14 times the rated voltage or more. The method of claim 1, wherein the instantaneous current detection circuit unit, A sense resistor configured to detect a voltage signal by sensing a current supplied through the transistor 240; An amplifier for receiving and amplifying the voltage signal detected by the sense resistor; A DC converter converting the voltage signal amplified by the amplifier to a DC level by removing noise components; A first comparator for outputting an output signal generated when the voltage converted by the DC converter to the reference voltage to the transistor 700 as a trip signal; A second comparator for generating an output signal by filtering only a signal corresponding to an instantaneous waveform from the voltage signal amplified by the amplifier; And And a pulse width comparator for controlling the output signal generated by the first comparator according to the output signal generated by comparing the pulse width of the output signal received by the second comparator with a preset reference pulse width. A circuit breaker that shortens the breaking time of the breaker when the instantaneous current is generated. The method of claim 6, And a reference pulse width of the pulse width comparator is set to 1 ms. The method of claim 6, When the output signal of the pulse width comparator is at the LOW level, the output signal generated by the first comparator is configured to cancel the output terminal of the pulse width comparator through a diode. Short circuit breaker. The method of claim 6, And an output signal generated by the first comparator when the output signal of the pulse width comparator is at a HIGH level, and is configured to be applied to a transistor.

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