KR20160141517A - The short test circuit for 3 phase circuit breaker and method for testing - Google Patents

The short test circuit for 3 phase circuit breaker and method for testing Download PDF

Info

Publication number
KR20160141517A
KR20160141517A KR1020150077308A KR20150077308A KR20160141517A KR 20160141517 A KR20160141517 A KR 20160141517A KR 1020150077308 A KR1020150077308 A KR 1020150077308A KR 20150077308 A KR20150077308 A KR 20150077308A KR 20160141517 A KR20160141517 A KR 20160141517A
Authority
KR
South Korea
Prior art keywords
circuit
power supply
test
pulse
phase
Prior art date
Application number
KR1020150077308A
Other languages
Korean (ko)
Inventor
정한상
박정수
서영환
Original Assignee
주식회사 대륙
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 대륙 filed Critical 주식회사 대륙
Priority to KR1020150077308A priority Critical patent/KR20160141517A/en
Publication of KR20160141517A publication Critical patent/KR20160141517A/en

Links

Images

Classifications

    • G01R31/024—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass

Abstract

Disclosed are a short circuit test circuit and a test method of a three-phase earth leakage breaker. A method for testing short circuit blocking of a three-phase earth leakage breaker comprises the steps of: generating a pulse based on a pulse oscillation circuit; generating a test signal for a short circuit test in ZCT test winding based on the pulse; and detecting a short circuit state in a short circuit detection circuit based on the test signal. The pulse oscillation circuit can receive power based on a power circuit for a short circuit test.

Description

Technical Field [0001] The present invention relates to a short circuit test circuit for a three-phase circuit breaker,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a leakage testing method and, more particularly, to a leakage test circuit and a testing method of a three-phase circuit breaker.

Electricity accidents due to the increase in electricity use in industrial sites are becoming larger and the damage is increasing every year. When an image is formed in one phase in a power system, unbalanced current flows in the load side or single phase power is supplied, which can cause great damage to the power system. The reason for the occurrence of the phase loss is that if the 3-phase electric circuit is erroneously wired or any one phase or two phases are broken, the load equipment may be damaged. In addition, since the occurrence of the formation occurs suddenly, it can not be predicted and it is classified as a main factor of electric fire.

If a phase failure occurs when an earth leakage breaker is used, it causes a bigger problem because the conventional earth leakage breaker system has a problem that it is impossible to perform a leakage detection operation when a phase is generated because a power source of a circuit is normally input on R phase and T phase. At this time, if a short circuit occurs, the earth leakage breaker does not operate normally, so it is not possible to prevent an electric shock to the human body and a fire accident caused by a short circuit. It is very important to have separate protection measures

KR 10-2006-0073305

One aspect of the present invention provides a leakage test method of a leak test circuit of a three-phase earth leakage breaker.

Another aspect of the present invention provides a leakage test circuit for a three-phase circuit breaker.

According to an aspect of the present invention, there is provided a method of testing a leakage cutoff of a three-phase earth leakage breaker, comprising: generating a pulse based on a pulse oscillation circuit; generating a test signal for a leakage test in a ZCT (zero current transformer) And detecting a short circuit in the electrical leak detecting circuit based on the test signal, wherein the pulse oscillating circuit can receive power based on a power supply circuit for an electrical leak test.

On the other hand, the electrical leak detecting circuit is supplied with power by the power supply circuit, and the power supply circuit can receive the three-phase power and rectify it.

The power supply circuit includes a rectifying circuit. The rectifying circuit receives an electrical signal through a plurality of surge resistors, a plurality of common resistors, and a capacitor connected in series on the R, receives a plurality of surges connected in series on the S, An electric signal is received through a resistor, a plurality of general resistors, and a capacitor, and an electric signal can be received through a plurality of surge resistors connected in series on T, a plurality of common resistors, and a capacitor.

Further, the power supply circuit for leakage testing includes a test power supply, and when the test power supply is turned on, power can be supplied to the pulse oscillation circuit.

The pulse oscillation circuit includes an unstable multivibrator, and a pulse generated on the basis of the unstable multivibrator generates a test signal by flowing a current to the ZCT test winding, and the ZCT equilibrium state can be broken down have.

A three-phase earth leakage breaker including a leakage current blocking test circuit according to another aspect of the present invention includes a pulse oscillation circuit implemented to generate a pulse, a test signal for a leakage test in a zero current transformer (ZCT) test winding based on the pulse, And a leakage detection circuit configured to detect a leakage current based on the test signal. The pulse oscillation circuit may be configured to receive power based on a leakage test power circuit.

On the other hand, the electrical leak detecting circuit is implemented to receive power by a power supply circuit, and the power supply circuit can receive and rectify three-phase power.

The power supply circuit includes a rectifying circuit. The rectifying circuit receives an electrical signal through a plurality of surge resistors, a plurality of common resistors, and a capacitor connected in series on the R, receives a plurality of surges connected in series on the S, A plurality of resistors, a plurality of general resistors, and a capacitor, and receives electrical signals through a plurality of surge resistors, a plurality of common resistors, and a capacitor connected in series on T.

In addition, the power supply circuit for leakage testing includes a test power supply, and the power supply circuit for leakage testing may be configured to supply power to the pulse oscillation circuit when the test power supply is turned on.

The pulse oscillation circuit includes an unstable multivibrator, and the pulse generated on the basis of the unstable multivibrator generates a test signal by flowing a current to the ZCT test winding so as to break down the equilibrium state of the ZCT. Can be implemented.

In the case of 3 phase implementation of the earth leakage breaker, even if the phase failure occurs at 1 phase due to miswiring or disconnection, the earth leakage breaker can operate normally to prevent electric shock to the human body and fire accident caused by electric leakage.

1 is a conceptual diagram showing a three-phase earth leakage breaker.
2 is a conceptual diagram showing a power supply circuit according to an embodiment of the present invention.
3 is a conceptual diagram showing a leakage test operation circuit of the three-phase earth leakage breaker according to the embodiment of the present invention.
4 is a conceptual diagram showing a power supply circuit for an electrical leak test according to an embodiment of the present invention.
5 is a conceptual diagram illustrating a pulse oscillation circuit according to an embodiment of the present invention.
6 is a conceptual diagram illustrating an earth leakage breaker according to an embodiment of the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a conceptual diagram showing a three-phase earth leakage breaker.

1, a three-phase earth leakage breaker includes a noise removing circuit 100, a sensitivity resistor 110, an electrical leak detecting circuit 120, a thyristor 130, a power supply circuit 140, a trip coil 150, A brain surge suppression circuit 160, and a test resistor 170.

The noise removal circuit 100 may be implemented to remove electrical noise generated in the circuit. Electrical noise is a voltage spark that is generated by the operation of parts or elements of the system and may be transmitted to other systems or other parts by a conduction mechanism, causing malfunction of the device. The noise removing circuit 100 may be implemented to remove electrical noise that may occur in the three-phase circuit.

The sensitivity resistor 110 may be implemented to select the sensitivity for blocking the leakage current. For example, the sensitivity resistor 110 is a slide switch type and can be switched. For example, the sensitivity of the earth leakage can be adjusted by adjusting the connection of the sensitivity resistor 110 to a high sensitivity type (30 mA or less) and a medium sensitivity type (50 to 1000 mA).

The electrical leak detecting circuit 120 may be implemented to receive a signal transmitted through a sensitivity resistor, amplify the received signal, and determine whether the electrical leak is short-circuited.

The thyristor 130 may be implemented to drive the trip coil 150 based on the detection result of the electrical leak current of the electrical leak detecting circuit. For example, when the leakage detection circuit 120 receives a signal transmitted through a sensitivity resistance, amplifies the signal, determines the size of the signal, and if the signal exceeds a predetermined standard, generates an output signal to turn the thyristor 130 on. When the thyristor 130 is turned on, a current flows to the trip coil 150 so that the earth leakage breaker can be tripped.

The power supply circuit 140 may be implemented to rectify the input power to DC. The control power source is rectified by DC from the power supply circuit 140 via the shock wave absorbing circuit taken on R, T of the internal main path of the earth leakage breaker, and can supply power to the electrical leak detecting circuit 120.

The trip coil 150 may be implemented to trip the earth leakage breaker by flowing current when the thyristor 130 is turned on. Specifically, when the ground fault current is equal to or greater than the predetermined value, the thyristor 130 is turned on, whereby a current flows through the trip coil 150 and the trip coil 150 is energized to instantaneously trip the earth leakage breaker.

The brain surge prevention circuit 160 may be implemented to prevent malfunction due to surge by absorbing various surges introduced into the power source stage.

A test resistor (or test circuit) 170 may be implemented for testing for an electrical short circuit.

The specific operation of the earth leakage breaker is as follows. The control power source may be rectified to DC from the power supply circuit 140 via the shock wave absorbing circuit (brain surge prevention circuit) 160 taken on R, T of the main circuit of the earth leakage breaker and applied to the electrical leak detecting circuit 120. Meanwhile, the electric signal generated in the ZCT (zero current transformer) 180 can be applied to the electrical leak detecting circuit 120 via the noise canceling circuit 100, the sensitivity resistor 110, and the like.

For example, the ZCT 180 may be implemented with a material having a high permeability. The ZCT 180 may be implemented with a ferromagnetic core, a primary conductor through which the main circuit current flows, and a secondary coil wound around the core. An electromotive force can be generated in the secondary winding by the magnetic flux corresponding to the magnetic flux difference of each phase by synthesizing the vector of the iron core by the magnetic flux generated by each phase current of the primary conductor. Therefore, when the vector sum of each phase current becomes 0 regardless of the magnitude of the primary current, the magnetic flux is canceled with each other in the iron core, and no electromotive force is generated in the secondary winding. If a ground fault occurs, the current balance of each phase collapses, and the iron core is excited by the magnetic flux corresponding to the magnitude of the ground fault current, so that an electromotive force may be generated in the secondary winding.

The electric leakage detecting circuit 120 receives and amplifies the electric signal generated in the ZCT, determines the magnitude of the amplified electric signal, and generates an output when it exceeds a certain standard to turn on the thyristor 130 on the right side of the electric leakage detecting circuit 120 State.

When the thyristor 130 is turned on, current flows to the trip coil 150 and the earth leakage breaker can be tripped. The noise removing circuit 100 and the brain surge suppression circuit 160 block the noise introduced from the signal terminal ZCT and the power supply end of the electronic circuit portion and absorb various surges introduced into the power supply end It can be implemented to prevent malfunction due to noise and surge.

In the conventional three-pole and four-pole earth leakage circuit breaker, the power supply circuit 140 receives the R and T phases (single phase) and drives the electric leakage detection circuit 120. When two poles are used in the three-pole and four-pole earth-leakage circuit breaker, they should be connected to R and T for normal operation of the leakage detection circuit (120). If the phase failure occurs in the earth leakage breaker, or miswiring occurs outside the R and T phases when using two poles, the earth leakage breaker may not operate.

In the conventional three-pole and four-pole earth fault detector, the test circuit connects the test resistor 170 on the load sides R and T, and then through the ZCT 180 (or the ZCT internal test winding) As shown in FIG. If an image is formed in the earth leakage breaker, or miswiring occurs outside the R and T phases when two poles are used, there may arise a problem that the earth leakage breaker does not operate during the test operation. Also, when the test button is pressed, the circuit breaker is not tripped, and the test resistor 170 may be damaged due to continuous voltage application.

In an embodiment of the present invention, a leakage circuit breaker for improving the power circuit 140 and the test circuit of the conventional circuit breaker is disclosed.

2 is a conceptual diagram showing a power supply circuit according to an embodiment of the present invention.

2, a power supply circuit capable of receiving three-phase power from an electrical leak test circuit of a three-phase circuit breaker according to an embodiment of the present invention is disclosed.

Referring to FIG. 2, the power supply circuit according to the embodiment of the present invention may be configured to receive and rectify three-phase power.

The power supply circuit can attenuate the AC power based on the combination of the resistors (R) 200 and 220 and the capacitor (C) 240. Further, the power supply circuit can constitute a voltage circuit using the surge registers (RP1 to RP6) The surge registers (RP1 to RP6) 200 may be implemented to limit the current flowing to the capacitor 240. [ When the capacitor 240 is initially charged with the current being charged, the capacitor 240 can flow almost infinite current until it is charged. On the other hand, if the two terminals of the charged capacitor 240 are shorted, the discharge current may be large enough to cause a spark. Therefore, the surge resistor 200 can be implemented in the power supply circuit for limiting the current flowing to the capacitor as described above.

The general resistors R1 to R9 220 may be auxiliary circuits for protecting the internal pressure of the capacitors C1 to C3.

Specifically, a plurality of surge resistors, a plurality of common resistors, and capacitors may be implemented on each of the lines on the R phase and the S phase. Referring to the R phase, two surge resistors RP1 and RP2, three general resistors R1, R2 and R3, and one capacitor C1 can be implemented in the line before the rectifying circuit. Referring to the S phase, two surge resistors RP3 and RP4, three general resistors R4, R5 and R6, and one capacitor C2 can be implemented in the line before the rectifying circuit. Referring to the T phase, two surge resistors RP5 and RP6, three general resistors R7, R8 and R9, and one capacitor C3 can be implemented in the line before the rectifying circuit.

When the power supply circuit is implemented based on the surge resistance 200, the common resistor 220, and the capacitor 240 as described above, it is possible to supply a sufficient current for driving the trip circuit while preventing breakage or malfunction of the circuit due to surge . The number of the surge resistor 200 and the common resistor 220 included in the power supply circuit may vary depending on the input voltage and the surge specification.

3 is a conceptual diagram showing a leakage test operation circuit of the three-phase earth leakage breaker according to the embodiment of the present invention.

3, a power supply circuit 300 for leakage testing and a pulse oscillation circuit 350 for a leakage test of a three-phase circuit breaker are disclosed.

According to the embodiment of the present invention, the test power supply circuit (leakage test power supply circuit) 300 may be provided separately from the power supply of the electrical leak detecting circuit to supply power to the pulse oscillating circuit 350 during the test button operation.

According to the embodiment of the present invention, since the power is supplied through the leakage testing power supply circuit 300 through the test button for the leakage test in the leakage circuit breaker, a separate current consumption may not normally occur.

The pulse oscillation circuit 350 can be implemented so that pulses can be oscillated in a simple circuit configuration using an unstable multivibrator. The pulse oscillation circuit 350 can force a current to flow through the ZCT test winding to break the equilibrium state of the ZCT and generate a pulse for the leak test operation. The multivibrator can be implemented with a general transistor transistor logic (TTL) integrated circuit (IC), TR, OP AMP, and frequency oscillation IC.

4 is a conceptual diagram showing a power supply circuit for an electrical leak test according to an embodiment of the present invention.

4, the power supply circuit for leakage testing includes a first power supply (Vcc) 400, a test button 410, a resistor R40 420, a transistor Q2 430, a zener diode ZD3 440, a capacitor C42 450, and a second power supply Vdd 460.

When the test button 410 is turned on, power based on the first power source 400 may be supplied.

A resistor R40 and a resistor 420 are connected between a base end and a collector end of the transistor Q2 430 and the base of the transistor Q2 430 the Zener diode ZD3 440 can be connected in series at the point where the base terminal and the resistor R40 420 meet. An emitter terminal of the transistor Q2 430 may be connected between the second power supply 460 and the capacitors C42 and 450. [

When the test button 410 is turned on, electric power can be supplied to the pulse oscillation circuit based on the power supply circuit for leakage testing.

5 is a conceptual diagram illustrating a pulse oscillation circuit according to an embodiment of the present invention.

5, the pulse oscillation circuit includes a first NAND circuit 500, a first resistor 510, a second NAND circuit 520, a second resistor 530, a first capacitor 540, a second capacitor 540, A second resistor 550 and a third resistor 560.

The input of the first NAND circuit 500 may be coupled to the first resistor 510 and the first capacitor 540. The output of the first NAND circuit 500 may be coupled to the first resistor 510 and the second capacitor 550. The input of the second NAND circuit 520 may be coupled to the second capacitor 550 and the second resistor 530 and the output of the second NAND circuit 520 may be coupled to the second resistor 530 and the third resistor 560 Lt; / RTI > A pulse may be output through the third resistor 560 and a pulse may be generated in the ZCT test winding to induce a leakage test.

6 is a conceptual diagram illustrating an earth leakage breaker according to an embodiment of the present invention.

6, the earth leakage breaker includes a noise removing circuit 100, a sensitivity resistor 110, an electrical leak detecting circuit 120, a thyristor 130, a power supply circuit 600, a trip coil 150, A power source circuit 160, a power source circuit for leakage testing 300, and a pulse oscillation circuit 350.

The noise removal circuit 100 may be implemented to remove electrical noise generated in the circuit as described above.

The sensitivity resistor 110 may be implemented to select the sensitivity for blocking the electrical leak. For example, the sensitivity resistor 110 is a slide switch type and can be switched. For example, by adjusting the connection of the sensitivity resistor 110, the sensitivity of the electric leak detection can be adjusted to a high sensitivity type (30 mA or less) and a medium sensitivity type (50 to 1000 mA).

The electrical leak detecting circuit 120 may be implemented to receive a signal transmitted through the sensitivity resistor 110 and amplify the signal to determine whether or not a short circuit is present. According to the embodiment of the present invention, the electrical leak detecting circuit 120 can amplify a signal derived based on a pulse oscillated by using the pulse oscillating circuit 350 to determine whether or not there is a short circuit.

The thyristor 130 may be implemented to drive the trip coil 150 based on the detection result of the electrical leak current of the electrical leak detecting circuit. For example, when the electrical leak detecting circuit 120 receives the pulse signal transmitted through the sensitivity resistor 110, amplifies the pulse signal, determines the size of the pulse signal, and if the pulse signal exceeds a certain standard, generates an output signal to turn the thyristor 130 on . When the thyristor 130 is turned on, current flows to the trip coil 150 to trip the earth leakage breaker.

In the power supply circuit 600, as described above with reference to FIG. 2, a plurality of surge resistors, a plurality of common resistors, and capacitors may be implemented on each of the lines on the R phase and the S phase. Two surge resistors RP1 and RP2, three general resistors R1, R2, and R3, and one capacitor C1 may be implemented in the line before the rectifying circuit. Two surge resistors RP3 and RP4, three general resistors R4, R5 and R6, and one capacitor C2 may be implemented in the line before the rectifying circuit in the S phase. Two surge resistors RP5 and RP6, three general resistors R7, R8 and R9, and one capacitor C3 may be implemented in the line before the rectifying circuit.

The trip coil 150 may be implemented to trip the earth leakage breaker by flowing current when the thyristor 130 is turned on. Specifically, when the ground fault current becomes equal to or greater than a predetermined value, the thyristor 130 is turned on, whereby a current flows through the trip coil 150 and the trip coil 150 is energized to instantaneously trip the earth leakage breaker have.

The brain surge prevention circuit 160 may be implemented to prevent malfunction due to surge by absorbing various surges introduced into the power source stage.

The power supply circuit 300 for leakage testing may be implemented to supply power to the pulse oscillation circuit 250 that oscillates a pulse for testing the earth leakage breaker as described above with reference to FIGS. Unlike a test resistor for testing whether or not an existing earth leakage current is cut off, a leakage circuit test power supply circuit 300 is implemented separately from the power supply of the leakage detection circuit 120, and power is supplied to the pulse oscillation circuit 350 during a test button operation .

The pulse oscillation circuit 350 can be implemented so that pulses can be oscillated in a simple circuit configuration using an unstable multivibrator. The pulse oscillation circuit 350 can force a current to flow through the ZCT test winding to break down the equilibrium state of the ZCT 180 and generate a pulse for the leak test.

The specific operation of the earth leakage breaker according to the embodiment of the present invention is as follows. The control power source is taken on R, S, T of the main circuit of the earth leakage breaker and is rectified to DC from the power supply circuit 600 via the shock wave absorbing circuit (brain surge prevention circuit) 160 and applied to the earth leakage cutoff circuit. The power supply circuit 600 may include a surge resistance, a common resistor, and a capacitor. When the power supply circuit 600 according to the embodiment of the present invention is used, a sufficient current for driving the trip circuit can be supplied while the breakage or malfunction of the circuit due to the surge is prevented. The number of surge resistors and general resistors included in the power supply circuit 600 may vary depending on the input voltage and the surge specification.

The electric signal generated on the basis of the pulse oscillation circuit 350 in the ZCT 180 may be applied to the electrical leak detecting circuit 120 via the noise canceling circuit 100 and the sensitivity resistor 120.

The electrical leak detecting circuit 120 receives an electrical signal based on the pulse oscillating circuit 350 generated in the ZCT 180, amplifies the electrical signal, determines the magnitude of the amplified electrical signal, The thyristor 130 on the right side of the switch 120 can be turned on.

When the thyristor 130 is turned on, current flows to the trip coil 150 and the leak detector can be tripped.

When all three phases are used as described above, no image is formed in the earth leakage breaker, and miswiring may not be generated. In addition, since no image is formed in the earth leakage breaker and no miswiring is generated, erroneous operation of the earth leakage breaker and burning of the test resistance due to continuous voltage application can be prevented.

The leakage test method for such a three-phase earth leakage breaker may be implemented in an application or implemented in the form of program instructions that can be executed through various computer components and recorded in a computer-readable recording medium. The computer-readable recording medium may include program commands, data files, data structures, and the like, alone or in combination.

The program instructions recorded on the computer-readable recording medium may be ones that are specially designed and configured for the present invention and are known and available to those skilled in the art of computer software.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like.

Examples of program instructions include machine language code such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules for performing the processing according to the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

100: Noise canceling circuit
110: Sensitivity resistance
120: Leakage detection circuit
130: Thyristor
140: power supply circuit
150: Trip coil
160: Brain surge prevention circuit
170: Test resistance
180: ZCT
300: Power circuit for leakage test
350: Pulse oscillation circuit
600: power supply circuit

Claims (10)

1. A method of testing a three-phase earth leakage breaker for short-
Generating a pulse based on the pulse oscillation circuit;
Generating a test signal for a leakage test in a zero current transformer (ZCT) test winding based on the pulse; And
Detecting a short circuit in the electrical leak detecting circuit based on the test signal,
Wherein the pulse oscillation circuit is supplied with power based on a power supply circuit for an electrical leak test. The method according to claim 1,
The electrical leak detecting circuit is supplied with power by a power supply circuit,
Wherein the power supply circuit receives the three-phase power supply and rectifies the three-phase power supply. 3. The method of claim 2,
Wherein the power supply circuit includes a rectifying circuit,
The rectifier circuit receives an electric signal through a plurality of surge resistors, a plurality of common resistors, and a capacitor connected in series on the R, receives a plurality of surge resistors connected in series on the S, a plurality of common resistors, and a capacitor And an electric signal is inputted through a plurality of surge resistors, a plurality of common resistors, and a capacitor connected in series on the T-phase. The method of claim 3,
Wherein the power supply circuit for leakage testing includes a test power supply,
Wherein the power supply circuit for leakage testing is supplied with power to the pulse oscillation circuit when the test power supply is turned on. 5. The method of claim 4,
Wherein the pulse oscillation circuit includes an unstable multivibrator,
Wherein the pulse generated on the basis of the unstable multivibrator generates a test signal by flowing a current to the ZCT test winding to break down the equilibrium state of the ZCT. A three-phase earth-leakage circuit breaker including a short-circuiting test circuit,
A pulse oscillation circuit implemented to generate a pulse;
A ZCT implemented to generate a test signal for a leakage test in a zero current transformer (ZCT) test winding based on the pulse; And
And an electrical leak detecting circuit configured to detect whether a short circuit is present based on the test signal,
Wherein the pulse oscillation circuit is implemented to receive power based on a power supply circuit for an electrical leak test. The method according to claim 6,
Wherein the electrical leak detecting circuit is implemented to be supplied with power by a power supply circuit,
Wherein the power supply circuit receives the 3-phase power supply and rectifies the 3-phase power supply. 8. The method of claim 7,
Wherein the power supply circuit includes a rectifying circuit,
The rectifier circuit receives an electric signal through a plurality of surge resistors, a plurality of common resistors, and a capacitor connected in series on the R, receives a plurality of surge resistors connected in series on the S, a plurality of common resistors, and a capacitor Wherein the electrical signal is received and receives electrical signals through a plurality of surge resistors, a plurality of common resistors, and a capacitor connected in series on the T-phase. 9. The method of claim 8,
Wherein the power supply circuit for leakage testing includes a test power supply,
Wherein the power supply circuit for leakage testing is configured such that power is supplied to the pulse oscillation circuit when the test power supply is turned on. 10. The method of claim 9,
Wherein the pulse oscillation circuit includes an unstable multivibrator,
Wherein the pulse generated on the basis of the unstable multivibrator is configured to generate a test signal by flowing a current to the ZCT test winding to break down the ZCT equilibrium state.
KR1020150077308A 2015-06-01 2015-06-01 The short test circuit for 3 phase circuit breaker and method for testing KR20160141517A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150077308A KR20160141517A (en) 2015-06-01 2015-06-01 The short test circuit for 3 phase circuit breaker and method for testing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150077308A KR20160141517A (en) 2015-06-01 2015-06-01 The short test circuit for 3 phase circuit breaker and method for testing

Publications (1)

Publication Number Publication Date
KR20160141517A true KR20160141517A (en) 2016-12-09

Family

ID=57574485

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150077308A KR20160141517A (en) 2015-06-01 2015-06-01 The short test circuit for 3 phase circuit breaker and method for testing

Country Status (1)

Country Link
KR (1) KR20160141517A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111751718A (en) * 2020-05-20 2020-10-09 中国电力科学研究院有限公司 Power electronic phase selection system and phase selection method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060073305A (en) 2004-12-24 2006-06-28 주식회사 포스코 Device for compressing coal in coke oven

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060073305A (en) 2004-12-24 2006-06-28 주식회사 포스코 Device for compressing coal in coke oven

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111751718A (en) * 2020-05-20 2020-10-09 中国电力科学研究院有限公司 Power electronic phase selection system and phase selection method thereof

Similar Documents

Publication Publication Date Title
KR100299014B1 (en) Ground circuit breaker with broadband noise immunity
RU2743460C1 (en) Method and device for fast elimination of ferromagnetic resonance of voltage transformer
WO2012127307A1 (en) Earth leakage detection device
KR20080087654A (en) Leak detecting device
KR100408427B1 (en) Circuit for Preventing a Earth Leakage Circuit Breaker from Miss-operating by Serge Voltage
Nasution et al. Case studies of magnetizing inrush current effect on differential & REF transformer protection
KR101033699B1 (en) Circuit for preventing a earth leakage circuit breaker from miss-operating by high frequency
KR20160141517A (en) The short test circuit for 3 phase circuit breaker and method for testing
RU2638299C2 (en) Device for protection of windings of one-phase transformer from damages
US11196242B1 (en) Circuit interrupter for interrupting an electric current during fault conditions
KR101993558B1 (en) Bidirectional selective ground fault protection relay and test device capable of detecting faulty wiring
KR200430868Y1 (en) Circuit breake
JP2774377B2 (en) Ground fault detector
JP6065253B2 (en) Earth leakage detector
JPH04271225A (en) Leakage protection system and leakage circuit breaker
JP6065252B2 (en) Earth leakage detector
JP2017157431A (en) Earth leakage circuit breaker
EP1107415A2 (en) Residual current breaker
US11562872B2 (en) Circuit interrupter for detecting breaker fault conditions and interrupting an electric current
JP2021016256A (en) Single line ground fault overvoltage suppression device for non-grounded system
JP7354926B2 (en) earth leakage breaker
JP2010040326A (en) Ground fault interrupter
EP3945650A1 (en) Electronic circuit breaker control unit
KR200355725Y1 (en) Circuit breaker capable of protection against lighining
JPH08273514A (en) Leakage current detection device

Legal Events

Date Code Title Description
E601 Decision to refuse application