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KR20160147599A - The module for detecting electric short with pulse signal using the different phase of the resistance type current and condenser type current - Google Patents

The module for detecting electric short with pulse signal using the different phase of the resistance type current and condenser type current Download PDF

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Publication number
KR20160147599A
KR20160147599A KR1020150084597A KR20150084597A KR20160147599A KR 20160147599 A KR20160147599 A KR 20160147599A KR 1020150084597 A KR1020150084597 A KR 1020150084597A KR 20150084597 A KR20150084597 A KR 20150084597A KR 20160147599 A KR20160147599 A KR 20160147599A
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leakage current
waveform
current
magnitude
leakage
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KR1020150084597A
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KR101720066B1 (en
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주연숙
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주식회사 코본테크
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    • G01R31/024—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/10—Measuring sum, difference or ratio
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R31/021—

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The present invention relates to a short circuit detection module which detects leakage current or no leakage current by determining magnitudes of resistance-type leakage current (Igc) and capacitance-type leakage current (Igr) in case of detecting leakage current flowing on an electric wire in a circuit breaker, determines a short circuit by detecting the magnitude of the resistance-type leakage current (Igr) flowing in the electric wire as it is, but determines a short circuit only when the magnitude of the capacitance-type leakage current (Igc) represents a large value which is about triple with respect to the set leakage current. The short circuit detection module according to the present invention generates, when leakage current flowing on an electric wire in a circuit breaker is detected, a pulse waveform through a voltage waveform input from an electric wire, compares the pulse waveform with a leakage current waveform and calculates the magnitude of leakage current. When resistance-type leakage current (Igr) and capacitance-type leakage current (Igc) flow as complex current, the magnitude of the resistance-type leakage current (Igr) having the same phase as that of the pulse waveform is detected as it is, and the magnitude of the capacitance-type leakage current (Igc) having a 90-degrees lead phase as compared with the pulse waveform is detected as a magnitude smaller than its size to calculate a vector sum of the complex leakage current, thereby reducing an influence based on the capacitance-type leakage current (Igc) at the time of detecting a short circuit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric leakage detecting module using a pulse wave sputtering method using a resistive leakage current waveform and a phase angle characteristic of a capacitive leakage current waveform,

The present invention relates to an electric leak detecting module for detecting a leakage current Igr flowing through an electric line while directly detecting a leakage current flowing through an electric line in an electric leakage circuit breaker, To an electric leakage detecting module for reducing a malfunction of an earth leakage breaker due to a capacitive leakage current (Igc) in an electric line.

More specifically, the magnitude of the resistive leakage current (Igr) and the capacitive leakage current (Igc) are detected to detect the leakage current, and the magnitude of the resistive leakage current (Igr) Leakage current Igc is determined to be a leakage current only when the magnitude of the leakage current Igc is about three times as large as the leakage current setting reference.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of detecting the magnitude of a leakage current in an electric wire line in an earth leakage breaker, and more particularly, to a leakage detection method for reducing a malfunction of an earth leakage breaker due to a capacitive leakage current Igc in an electric line.

1 is a state diagram for explaining the concept of a leakage current. As shown in the figure, an electric leakage circuit breaker is installed in the electric line running from the power source side to the load side, and a leakage current flows from the electric wire to the ground due to deterioration of the ground insulation of the electric device connected to the electric wire and the electric wire. This is called a resistive leakage current (Igr). In other words, the resistive leakage current (Igr) is the electric current flowing from the electric wire to the earth due to the insulation breakdown in the coating with the electric wire, which causes fire and electric shock accidents.

In addition, a leakage current flows from the electric wire to the ground at the earth capacitance of an electric device connected to the electric wire and the electric wire, which is referred to as a capacitive leakage current (Igc). In other words, the capacitive leakage current (Igc) is the current generated by the product and the capacitance between the line and the ground. In past analogue period, the leakage current (Igc) In the digital age, the component of capacitive leakage current (Igc) is very high.

Therefore, as shown in the figure, a combined leakage current (Ig), in which a resistive leakage current Igr and a capacitive leakage current Igc are combined, flows through the electric line.

FIG. 2 shows a circuit diagram constructed inside a conventional earth leakage breaker, which shows an earth leakage breaker that is used by rectifying the constant power sources L1 and L2 supplied to an earth leakage breaker through a full-wave rectifier circuit.

Referring to the drawing, a circuit diagram of the inside of the earth leakage breaker is shown. The power source supplied with the full-wave rectifier is inputted to the control power source for driving the earth leakage detection control unit 10 to detect a short circuit by the video current transformer ZCT So that the leakage detection control unit 10 judges the occurrence of leakage current from the output current of the leakage detection coil of the video current transformer ZCT.

In the case where the leakage current detection control unit 10 judges the leakage current state, a voltage is applied to the trip coil in the earth leakage breaker to send a gate signal to the thyristor (SCR) 20 so as to block the contact of the earth leakage breaker do.

When the gate signal is sent to the thyristor (SCR) in the electrical leak detecting circuit 10, the thyristor 20 is energized while the thyristor 20 is energized to flow a current as shown in the thick line, The contact of the earth leakage breaker is opened while the trip device (not shown) is driven.

In order to determine the leakage current in the leakage detection control unit 10, the leakage current control unit 10 measures the leakage current of the electric wire. In the conventional leakage detection control unit 10, When a leakage current is detected, a gate signal is sent to the thyristor (SCR) 20.

The leakage current value determined by the leakage detection control unit 10 detects the composite leakage current Io on the electric line. That is, as the leakage current of the electric line, the composite leakage current Io is a vector sum of the resistive leakage current Igr and the capacitive leakage current Igc, and the relationship can be expressed as follows.

Io = Igr + Igc

However, the current flowing through the human body during the human electric shock is the resistive leakage current (Igr), the leakage current causing the electric fire is also the resistive leakage current (Igr), and the capacitive leakage current (Igc) is not related to the human body electric shock and leakage current fire. Therefore, it is ideal that the earth leakage breaker detects the resistive leakage current (Igr) flowing in the electric wire and operates when this value exceeds the reference value.

However, the leakage current value determined by the leakage detection control unit 10 does not detect only the resistive leakage current Igr, but detects the composite leakage current Io including the capacitive leakage current Igc. Therefore, the existing leakage circuit breaker operates when the compound leakage current (Io) value exceeds the reference value.

The combined leakage current (Ig) is the sum of the resistive leakage current (Igr) and the capacitive leakage current (Igc). Therefore, the resistive leakage current (Igr) The leakage circuit breaker operates even if the value of " 1 " That is, the electric leakage circuit breaker malfunctions and sudden power failure occurs.

In order to improve this, the technique disclosed in the Korean Registered Utility Model No. 20-0453295 (designation: a circuit breaker for a large impact current converter) discloses that a leakage current sensor (Igc The leakage current of the leakage current sensor is set to be less than the leakage current of the current leakage current Igc.

As the canceling current capable of canceling the capacitive leakage current Igc, first, a method of flowing the capacitive current Ic in the direction opposite to the capacitive leakage current flowing in the auxiliary line of the leakage current sensor, Discloses a method of flowing an inductive current (In) to an auxiliary winding of a leakage current sensor.

In other words, a canceling current is supplied to the auxiliary winding of the leakage current sensor to detect a capacitive leakage current (Igc) smaller than the actual capacitive leakage current Igc flowing through the electric line in the leakage current sensor, .

However, in order to construct such a method, it is necessary to physically install a separate auxiliary winding in the leakage current sensor so as to flow a current capable of canceling the capacitive leakage current (Igc) flowing through the electric wire.

However, it is not easy to change the physical configuration of the existing earth leakage breaker, and even if a new earth leakage breaker is manufactured in this way, it is pointed out that the increase in cost and manufacturing hassle caused by the addition of the auxiliary winding .

In order to solve the above problems, the present invention provides a leakage detecting circuit module of an earth leakage breaker, which detects leakage current (Igr) and resistive leakage current (Igc) Igr) is directly detected to judge a short circuit, and the leakage leakage current Igc is judged to be a short circuit only when the magnitude of the leakage current Igc is about three times as large as the leakage current setting reference The purpose.

In order to solve the above problems, the present invention provides an electrical leak detecting module for reducing a malfunction of an earth leakage breaker due to a capacitive leakage current in an electric line, the method comprising: generating a pulse waveform using a voltage waveform input from the electric line; And the leakage current is measured by comparing the current magnitude of the generated pulse waveform and the current magnitude of the leakage current waveform generated in the electric line to detect the leakage current. The resistive leakage current waveform and the phase angle of the capacitive leakage current waveform Leakage detection module using pulsed spark -

Wherein the electrical leak detecting module includes: a pulse generator for generating a pulse waveform through a voltage waveform input from the electric line; A semiconductor switch which is triggered by a detection signal generated while a leakage current flows in a video current transformer installed in an electric cable and is energized; And detecting a leakage current while calculating a magnitude of a leakage current by comparing a current magnitude of the pulse waveform and a current magnitude of a leakage current waveform generated in the electric wire line while the semiconductor switch is triggered and a pulse waveform generated in the pulse generator is input, And a leakage current detector for detecting a leakage current.

The leak current detector compares the current magnitude of the generated pulse waveform with the current magnitude of the resistive leakage current (Igr) waveform having the same phase generated in the electric line to calculate the current magnitude of the resistive leakage current (Igr) waveform, .

Also, the leakage current detector compares the current magnitude of the generated pulse waveform with the current magnitude of the capacitive leakage current (Igc) waveform having the phase of 90 degrees generated in the electric line to determine the current of the capacitive leakage current (Igc) waveform And to detect a short circuit while estimating the size.

Also, the leakage current detector may be configured to detect a leakage current (Igc) waveform having a current magnitude of the generated pulse waveform and a resistive leakage current (Igr) waveform having the same phase generated in the electric line and a capacitive leakage current The leakage current is calculated by comparing the magnitude of the composite leakage current with the current magnitude.

In the electrical leak detecting module of the present invention, the pulse generator further comprises a pulse width sensitive resistor (R1) for setting a pulse width of a pulse waveform to be generated.

Further, in the electrical leak detecting module of the present invention, a pulse size sensitivity resistor (R3) for setting a pulse size of a pulse waveform when the pulse of the pulse generated by the pulse generator is input to the leakage current detector while the semiconductor switch is triggered do.

The following effects can be achieved through the leakage detecting current due to the resistive leakage current waveform of the present invention and the phase angle characteristic of the capacitive leakage current waveform.

First, in the case of detecting leakage current flowing in an electric wire line in an earth leakage breaker according to the present invention, a pulse waveform is generated through a voltage waveform input from an electric wire, and compared with a leakage current waveform to calculate a leakage current magnitude Thereby, the magnitude of the resistive leakage current (Igr) having the same phase as the pulse waveform of the leakage current component can be detected as it is and the leakage current can be judged.

Secondly, in the case where the leakage current flowing through the electric line is detected in the earth leakage breaker, the electric leakage detecting module of the present invention is configured to generate a pulse waveform through a voltage waveform inputted from an electric wire, compares the waveform to a leakage current waveform, The leakage current component Igc having a phase of 90 degrees in phase with respect to the pulse waveform of the leakage current component can be judged as a short circuit only when the magnitude of the leakage current value Igc is about three times as large as the set leakage current value, It is possible to reduce the influence of the capacitive leakage current (Igc) at the time of detecting the electric leakage.

Third, in the case where the leakage current flowing through the electric line is detected in the earth leakage breaker, the electric leakage detecting module of the present invention is configured to generate a pulse waveform through a voltage waveform input from the electric line and compare the leakage current waveform with the leakage current waveform, Thus, when the resistive leakage current Igr and the capacitive leakage current Igc flow in a complex current, the magnitude of the resistive leakage current Igr having the same phase as that of the pulse waveform is detected as it is, The magnitude of the capacitive leakage current Igc is smaller than the magnitude of the leakage current Igc, and the magnitude of the vector sum of the complex leakage current is calculated, thereby reducing the influence of the capacitive leakage current Igc .

Fourthly, in the pulse generator constituted in the electrical leak detecting module according to the present invention, the pulse width sensitive resistance R2 for setting the pulse width when generating the pulse waveform is constituted so that the capacity detected by the electrical leak detecting module according to the setting width of the pulse width The detection sensitivity of the leakage current Igc can be controlled.

Fifth, in the electrical leak detecting module according to the present invention, when a semiconductor switch is triggered and a pulse waveform generated by the pulse generator is input to the leakage current detector, a pulse size sensitivity resistor R3 for setting a pulse size of a pulse waveform is constructed , The detection sensitivity of the capacitive leakage current (Igc) detected by the electrical leak detecting module and the detection sensitivity of the resistive leakage current (Igr) can be controlled according to the setting size of the pulse size.

1 is a state diagram for explaining the concept of a leakage current.
2 shows a circuit diagram of the inside of a conventional earth leakage breaker.
3 is a block diagram of an electrical leak detecting module according to an embodiment of the present invention.
4 is a circuit diagram of an electrical leak detecting module according to an embodiment of the present invention.
5 is an explanatory view of the operation of the electrical leak detecting module according to the embodiment of the present invention.
6 shows a concept of leakage current detection by a pulse wave using a phase angle characteristic of a resistive leakage current and a capacitive leakage current according to an embodiment of the present invention.
7 is a state diagram showing a trip characteristic of the electrical leak detecting module according to an embodiment of the present invention compared with a trip characteristic of a conventional electrical leakage breaker.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an earth leakage detection module by a pulse wave using the resistive leakage current waveform and the phase angle characteristic of a capacitive leakage current waveform according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram of an electrical leak detecting module according to an embodiment of the present invention. Referring to the drawings, there is shown an earth leakage breaker which rectifies and uses constant power sources L1 and L2 supplied to an earth leakage breaker through a full-wave rectifier circuit.

Referring to the drawing, the circuit diagram of the inside of the earth leakage breaker is shown as follows. The power source supplied with the full-wave rectifier is inputted to the control power source for driving the electrical leak detecting module 100 so that the zero- So that the leakage detecting module 100 judges the occurrence of leakage current from the output current of the leakage detecting coil of the zero-current transformer ZCT.

When the electrical leak detecting module (100) judges the electrical leak condition, a gate signal is sent to the thyristor (SCR) (200) to apply a voltage to the trip coil in the electrical leakage breaker to shut off the contacts of the electrical leakage breaker do.

When the gate signal is sent to the thyristor (SCR) 200 in the electrical leak detecting module 100, the thyristor 200 is energized while the thyristor 200 is energized, so that a current flows as shown in the thick line, and the voltage is applied to the trip coil 300 So that the trip device (not shown) is driven to open the contact of the earth leakage breaker.

In order to determine the leakage current in the leakage detection module 100, the leakage current of the electric wire is measured. In the conventional leakage detection module 100, a leakage current value to be determined as a leakage current is set. When a leakage current is detected, a gate signal is sent to the thyristor (SCR) 20.

The leakage current value determined by the leakage detection module 10 detects the composite leakage current Io on the electric line. That is, as the leakage current of the electric line, the composite leakage current Io is a vector sum of the resistive leakage current Igr and the capacitive leakage current Igc.

Accordingly, the present invention provides a leak detecting circuit module for an electric leak detecting circuit, which detects leakage current (Igr) and leakage current (Igc) by detecting leakage current (Igr) and resistive leakage current The leakage current (Igr) is detected as it is and the leakage current is judged. However, when the magnitude of the capacitive leakage current (Igc) largely independent of the human body electric shock and the leakage current is about three times as large as the leakage current setting reference An electric leakage detecting module configured to judge that there is a short circuit.

FIG. 4 is a circuit diagram of an electrical leak detecting module according to an embodiment of the present invention. FIG. 5 is an explanatory diagram illustrating an operation of an electrical leak detecting module according to an embodiment of the present invention. Referring to FIG. 1, the electric leakage detecting module 100 includes a pulse generator 110 for generating a pulse waveform through a voltage waveform input from the electric line.

The pulse generator 110 includes a comparator 110a and a voltage waveform input to the comparator 110a and a constant voltage waveform in which a voltage waveform input from the electric line is converted into a direct current is input to the comparator 110a.

5, the two waveforms are compared with each other through the comparator 110a, and a pulse waveform is generated only for a region of the voltage waveform input to the electric line, which is larger than the magnitude V1 of the constant voltage waveform.

At this time, the pulse generator 110 further comprises a pulse width sensitivity resistor R2 for setting a pulse width of the generated pulse waveform. Accordingly, the magnitude (V1) of the constant voltage waveform can be converted through the pulse width sensitivity resistor (R2), and the pulse width of the pulse waveform generated thereby can be controlled.

Alternatively, the pulse waveform may be generated by setting the time on both sides of the peak voltage value in the period (16.66 ms) of the voltage waveform input from the electric line, and passing only the waveform during the set time .

The pulse generator 110 can control the detection sensitivity of the capacitive leakage current Igc detected by the electrical leak detecting module according to the set width of the pulse width of the generated pulse waveform. This will be described later.

In addition, the electrical leak detecting module 100 is constituted by a semiconductor switch 160 that is triggered by a sensing signal generated while a leakage current flows in a Zero Current Transformer (ZCT) installed in an electric cable and is energized.

The pulse width of the pulse waveform generated by the pulse generator 110 is input to the electrical leak detection module 100 while the semiconductor switch 160 is triggered and the current waveform of the pulse waveform and the leakage current waveform The leakage current detector 120 for detecting the leakage current is constructed while comparing the magnitudes of the currents to calculate the magnitude of the leakage current.

The pulse width of the pulse waveform generated by the pulse generator 110 is input to the leakage current detector 120 when the semiconductor switch 160 is triggered. A pulse size sensitivity resistor (R3, 170) is further configured.

It is possible to control the detection sensitivity of the capacitive leakage current Igc as well as the resistive leakage current Igr detected by the electrical leak detecting module according to the pulse size of the pulse waveform converted through the pulse size sensitivity resistors R3 and 170 do. This will be described later.

5, the waveforms of the pulse waveform and the leakage current input to the leakage current detector 120 are the same as those of the leakage current Igr of the leakage current, The phase angle of the pulse wave is 90 degrees ahead of the phase of the pulse waveform.

The leakage detection module 100 of the present invention is characterized in that the current amplitude of the pulse waveform generated from the voltage waveform of the electric line is divided into a resistive leakage current (Igr) waveform having the same phase and a capacitive leakage current Igc ) Waveform of the input signal to determine the leakage current, thereby determining the leakage current, and will be described later.

The leakage detection module 100 includes an RC integration circuit unit 130 for delaying a signal output from the leakage current detector 120 by a predetermined time. The RC integration circuit unit 130 accumulates a certain amount of leakage current, A comparator 140 for outputting a signal is further constructed.

The comparator 140 outputs a gate signal to the thyristor (SCR) 200 while driving the latch circuit 150 when the magnitude of the voltage accumulated from the leakage current reaches a predetermined voltage level or more.

6 shows a concept of leakage current detection by a pulse wave using a phase angle characteristic of a resistive leakage current and a capacitive leakage current according to an embodiment of the present invention.

The leakage current detector 120 compares the current amplitude of the pulse waveform generated by the pulse generator 110 with the current amplitude of the resistive leakage current (Igr) waveform having the same phase generated in the electric line, And to detect a leakage current while calculating the current magnitude of the leakage current (Igr) waveform.

As shown in the figure, when the current magnitude of the resistive leakage current (Igr) waveform is more than 23mA (① waveform), the voltage is applied to the trip coil in the earth leakage breaker to cut off the contact of the earth leakage breaker connected to the constant power source In contrast, when the current magnitude of the resistive leakage current (Igr) waveform is less than 23 mA (② waveform, ③ waveform), the leakage current leakage (Igr) alone does not operate the earth leakage breaker.

In other words, the leakage detection module 100 of the present invention generates a pulse waveform in the pulse generator 110 through the voltage waveform inputted in the electric line, and outputs the pulse waveform through the leakage current detector 120 to the leakage current waveform of the same phase The magnitude of the leakage current can be determined as it is by detecting the magnitude of the leakage current Igr having the same phase as the pulse waveform of the leakage current component.

Also, the leakage current detector 120 compares the current magnitude of the pulse waveform generated by the pulse generator 110 with the magnitude of the capacitive leakage current (Igc) waveform having the 90-degree phase in phase, And to detect the leakage current while calculating the current magnitude of the leakage current (Igc) waveform.

 As shown, when the current magnitude of the capacitive leakage current (Igc) type is less than the set 23 mA (① waveform), the capacitive leakage current Igc alone does not operate the earth leakage breaker.

As a characteristic of the present invention, even if the current magnitude of the capacitive leakage current (Igc) waveform is 41 mA or more, which is set to the leakage current of 23 mA or more (waveform (2)), the capacitive leakage current (Igc) waveform The leakage current Igc itself does not operate the contact of the earth leakage breaker even in this case.

However, when the current magnitude of the capacitive leakage current (Igc) waveform is larger than the current magnitude of the pulse waveform (③ waveform), the capacitive leakage current (Igc) Voltage is applied to cut off the contacts of the earth leakage breaker connected to the constant power source.

Accordingly, the leakage detection module 100 of the present invention generates a pulse waveform in the pulse generator 110 through the voltage waveform input from the electric line, and outputs the pulse waveform through the leakage current detector 120 to the pulse waveform of the leakage current component The leakage current Igc is compared with the capacitive leakage current Igc having the phase of 90 degrees and the magnitude of the capacitive leakage current Igc is judged as a short circuit only when the magnitude of the magnitude of the capacitive leakage current Igc is about three times as large as the leakage current reference, The influence of the capacitive leakage current Igc upon detection can be reduced.

The magnitude of the resistive leakage current Igr and the capacitive leakage current Igc detected as a short circuit in the electrical leak detecting module 100 of the present invention can determine the sensitivity by controlling the pulse magnitude through the pulse size sensitivity resistor R3 . That is, the illustrated pulse amplitude of 23 mA can control the pulse magnitude through the pulse size sensitivity resistor R3 to change the leakage current value judged as the leakage current.

The magnitude of the capacitive leakage current Igc detected by the leakage current is controlled by controlling the pulse width sensitivity resistor R1 for setting the pulse width when the pulse generator 110 generates the pulse waveform, The detection sensitivity of the capacitive leakage current Igc detected by the electrical leak detecting module 100 can be controlled.

That is, as the pulse width is narrower, the leakage current is judged to be a larger value based on the leakage current value of the capacitive leakage current Igc, and the pulse width is determined by the leakage current value set through the pulse size sensitivity resistor R3 (Igc) is 3 to 5 times larger than the rated leakage current (Igc), the voltage is applied to the trip coil in the earth leakage breaker alone by the capacitive leakage current (Igc) So as to block the contact points.

That is, the electrical leak detecting module 100 controls the pulse width sensitivity resistor R3 and the pulse width sensitivity resistor R1 so as to minimize the influence of the capacitive leakage current Igc upon determining the leakage current.

In addition, the leakage current detector 120 detects the current amplitude of the pulse waveform generated by the pulse generator 110, the current magnitude of the resistive leakage current (Igr) waveform having the same phase generated in the electric line, Leakage current (Igc) waveform and comparing the magnitude of the composite leakage current with the current magnitude of the leakage current (Igc) waveform.

The resistive leakage current Igr and the capacitive leakage current Igc are simultaneously generated when a resistive leakage current Igr waveform and a capacitive leakage current Igc waveform are generated at the same time, However, if the magnitude of the composite leakage current is calculated as the set leakage current value by the vector sum, the leakage current is detected.

In the conventional earth leakage breaker, the current leakage is determined to be 41 mA in the case of the capacitive leakage current (Igc) waveform (② waveform). However, in the leakage detection module 100 of the present invention, The current magnitude of the capacitive leakage current (Igc) waveform (② waveform) is determined to be 20 mA.

Therefore, as shown in the figure, the magnitude of the composite leakage current as a vector sum is determined to be a value (A) smaller than the conventional (B) value.

That is, when detecting the leakage current flowing in the electric wire line in the earth leakage breaker, the electric leakage detecting module 100 of the present invention generates a pulse waveform through the voltage waveform inputted from the electric wire, compares the waveform with the leakage current waveform, When the resistive leakage current Igr and the capacitive leakage current Igc flow in a complex current, the magnitude of the resistive leakage current Igr having the same phase as that of the pulse waveform is detected as it is, The magnitude of the capacitive leakage current (Igc) in the phase-phase is detected to be smaller than its own size, and the magnitude of the vector sum of the composite leakage current is calculated, thereby reducing the influence of the capacitive leakage current (Igc) There is an effect.

7 is a state diagram showing a trip characteristic of the electrical leak detecting module according to an embodiment of the present invention compared with a trip characteristic of a conventional electrical leakage breaker. The upper graph of the bar shows the trip characteristics of the conventional earth leakage breaker and the lower graph shows the trip characteristics of the leakage detection module of the present invention.

The tripping characteristic of the conventional earth leakage breaker is determined as a short circuit when the resistive leakage current Igr and the capacitive leakage current Igc are not distinguished from each other and the current value of the complex current is set to 23 mA as the leakage current itself. As shown in FIG.

However, in the case of the present invention, in the case where the current value set by the leakage current is 23 mA, when the leakage current Igr itself is generated due to the leakage current in the leakage detection module 100, The contact of the breaker is tripped. When the leakage current Igr itself is generated by the leakage current, it is judged that there is a short circuit in case of 65mA, and the contact of the leakage breaker is tripped.

That is, the leakage leakage current (Igr) flowing through the electric wire is detected as it is to determine the leakage current. However, when the leakage current Igc is about three times larger than the leakage current setting reference, It is possible to reduce the influence of the capacitive leakage current Igc at the time of detecting the electric leakage.

When the resistive leakage current Igr and the capacitive leakage current Igc flow in a complex current, the magnitude of the resistive leakage current Igr is detected as it is, and a capacitive leakage The magnitude of the current Igc is detected to be smaller than the magnitude of the current Igc, and the magnitude of the vector sum of the composite leakage current is calculated. Thus, the influence of the capacitive leakage current Igc at the time of detecting the leakage current can be reduced.

In the foregoing, the present invention has been described with reference to the preferred embodiments thereof with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings and the foregoing embodiments are provided by way of illustration for purposes of clarity of understanding to those skilled in the art to which the present invention pertains. It is, therefore, to be understood that the various embodiments of the present invention may be embodied in various forms without departing from the essential characteristics thereof, and the above-described embodiments are to be considered as illustrative and not restrictive. Accordingly, the scope of the present invention should be construed in accordance with the invention as set forth in the appended claims rather than the foregoing embodiments, and various changes, alternatives, and equivalents by those skilled in the art may be made by the inventions It is obvious that it is included in the range of.

100: Leakage detection module 110: Pulse generator
110a: pulse width sensitivity resistance 110b: comparator
120: Leakage current detector 160: Semiconductor switch
170: Pulse size sensitivity resistance
200: Thyristor (SCR) 300: Trip coil

Claims (4)

In an electrical leak detecting module for reducing a malfunction of an earth leakage breaker due to a capacitive leakage current in an electric line,
A pulse waveform is generated using the voltage waveform input from the electric line, and a leakage current is calculated by comparing the current magnitude of the generated pulse waveform with the current magnitude of the leakage current waveform generated in the electric line, And the leakage current waveform of the capacitive leakage current waveform. The electric vehicle according to claim 1,
A pulse generator for generating a pulse waveform through a voltage waveform input from the electric line;
A semiconductor switch which is triggered by a detection signal generated while a leakage current flows in a video current transformer installed in an electric cable and is energized; And
The semiconductor switch is triggered and a pulse waveform generated by the pulse generator is input. The current magnitude of the pulse waveform and the current magnitude of the leakage current waveform generated in the electric line are compared to detect a leakage current while calculating the magnitude of the leakage current Wherein the leakage current detector comprises a leakage current detector and a leakage current detector. The leakage current detector according to claim 2,
And comparing the current magnitude of the generated pulse waveform with the current magnitude of the resistive leakage current (Igr) waveform having the same phase generated in the electric line to detect the leakage current while calculating the current magnitude of the resistive leakage current (Igr) waveform And a leakage current waveform of the capacitive leakage current waveform. The leakage current detector according to claim 2,
The current magnitude of the generated pulse waveform is compared with the current magnitude of the capacitive leakage current (Igc) waveform having the phase of 90 degrees generated in the electric line to detect the leakage current while calculating the current magnitude of the capacitive leakage current (Igc) Wherein the leakage current waveform includes a resistive leakage current waveform and a phase angle characteristic of a capacitive leakage current waveform.
KR1020150084597A 2015-06-15 2015-06-15 The module for detecting electric short with pulse signal using the different phase of the resistance type current and condenser type current KR101720066B1 (en)

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Cited By (4)

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KR20180113402A (en) 2017-04-06 2018-10-16 (주)에디테크 Intelligent power facility failure prediction system and method using three-phase leakage current measurement method by insulation deterioration
KR20220114199A (en) * 2021-02-08 2022-08-17 한미수 Earth leakage blocking device to prevent malfunction
KR102497871B1 (en) * 2022-09-15 2023-02-08 홍정애 Surge protect device for Charging Apparatus of an Electrical Vehicle
KR20240086104A (en) 2022-12-09 2024-06-18 주식회사 지용엔지니어링 The leakage detector with warning function of the leakage current

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KR100876651B1 (en) * 2007-04-16 2009-01-09 김형열 Method of leakage current break and measurement leakage current use phase calculation
KR20100135509A (en) * 2009-06-17 2010-12-27 한전케이디엔주식회사 Automatic meter reading, remote meter reading service electric meter which includes a leakage rheometry function

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KR100876651B1 (en) * 2007-04-16 2009-01-09 김형열 Method of leakage current break and measurement leakage current use phase calculation
KR20100135509A (en) * 2009-06-17 2010-12-27 한전케이디엔주식회사 Automatic meter reading, remote meter reading service electric meter which includes a leakage rheometry function

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180113402A (en) 2017-04-06 2018-10-16 (주)에디테크 Intelligent power facility failure prediction system and method using three-phase leakage current measurement method by insulation deterioration
KR20220114199A (en) * 2021-02-08 2022-08-17 한미수 Earth leakage blocking device to prevent malfunction
KR102497871B1 (en) * 2022-09-15 2023-02-08 홍정애 Surge protect device for Charging Apparatus of an Electrical Vehicle
KR20240086104A (en) 2022-12-09 2024-06-18 주식회사 지용엔지니어링 The leakage detector with warning function of the leakage current

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