KR101358051B1 - Apparatus of analyzing leakage current - Google Patents

Apparatus of analyzing leakage current Download PDF

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KR101358051B1
KR101358051B1 KR1020130098731A KR20130098731A KR101358051B1 KR 101358051 B1 KR101358051 B1 KR 101358051B1 KR 1020130098731 A KR1020130098731 A KR 1020130098731A KR 20130098731 A KR20130098731 A KR 20130098731A KR 101358051 B1 KR101358051 B1 KR 101358051B1
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South Korea
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phase
leakage current
current
voltage
phase angle
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KR1020130098731A
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Korean (ko)
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임용배
이상익
김동우
김재현
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한국 전기안전공사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
    • G01R15/165—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices measuring electrostatic potential, e.g. with electrostatic voltmeters or electrometers, when the design of the sensor is essential
    • 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
    • G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
    • G01R25/005—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller, or for passing one of the input signals as output signal

Abstract

The present invention relates to an apparatus for analyzing a leakage current and especially, to an apparatus for analyzing a leakage current, in order for a measured effective leakage current to be checked in the outside through wireless communication. An apparatus for analyzing a leakage current of the present invention includes: a filter part for receiving a voltage and removing the harmonics and noise of a voltage decreased through a potential transformer (PT); a first phase detection part for detecting a voltage phase by receiving an output of the filter part; a leakage current measurement part for measuring a current difference by being installed in the outside of a power supply line and a neutral line using a zero phase current transformer (ZCT); a second phase detection part for receiving and amplifying an output of the leakage current measurement part using an amplification circuit, and detecting a current phase whose harmonics and noise are removed; a phase angle measurement part for calculating a phase angle by using the detected voltage phase and the detected current phase, and measuring and outputting a resistive leakage current (Igr) and a capacitive leakage current (Igc) with a zero phase current (Io) and the phase angle; and a communication part for delivering an output of the phase angle measurement part to an external terminal. [Reference numerals] (110) Filter part; (120) First phase detection part; (130) Leakage current measurement part; (140) Second phase detection part; (150) Phase angle measurement part; (160) Communication part

Description

누설전류 분석장치{Apparatus of analyzing leakage current}Apparatus of analyzing leakage current

본 발명은 누설전류 분석장치에 관한 것으로서, 특히 측정된 유효누설전류를 무선통신을 통해 외부에서 확인할 수 있도록 누설전류를 분석하는 누설전류 분석장치에 관한 것이다.The present invention relates to a leakage current analysis device, and more particularly, to a leakage current analysis device for analyzing the leakage current so that the measured effective leakage current from outside through wireless communication.

종래, 한국공개특허 제2011-0011521호, '저항성 누설전류 검출장치 및 이를 구비한 분전반' 외에 다수 출원 및 공개된 바 있다.In the prior art, Korean Patent Application Publication No. 2011-0011521, 'Resistive leakage current detection device and a distribution panel having the same' has been published and published a number of applications.

종래기술은, 전선로로부터 합성누설전류를 검출하는 누설전류검출기; 상기 누설전류검출기에서 검출된 합성누설전류의 위상을 보정하는 위상 보정기; 전선로의 전압을 검출하여 동기신호를 발생하는 전원 동기신호 발생기; 위상이 보정된 합성누설전류와 전원 동기신호를 입력받아 전원주파수의 매 한주기 마다 저항성누설전류를 계산하는 한주기 적분기; 경보전류 기준치를 설정하는 경보전류 기준치 설정기; 설정된 상기 경보전류 기준치를 저장하는 기준치 저장기; 저장된 상기 경보전류 기준치와 상기 저항성누설전류의 값을 비교하여 상기 저항성누설전류의 값이 상기 저장된 경보전류 기준치보다 크면 경보신호를 출력하는 비교기; 및 상기 비교기가 출력한 경보 신호에 의해 경보를 발하는 경보기;를 포함하는 것을 특징으로 한다.The prior art includes a leakage current detector for detecting a synthetic leakage current from a wire; A phase corrector for correcting a phase of the synthetic leakage current detected by the leakage current detector; A power supply synchronous signal generator for detecting a voltage on a wire and generating a synchronous signal; A one-cycle integrator that receives the phase-corrected synthesized leakage current and the power synchronization signal and calculates the resistive leakage current at each cycle of the power frequency; An alarm current reference value setter for setting an alarm current reference value; A reference value storage unit for storing the set alarm current reference value; A comparator comparing the stored alarm current reference value with the value of the resistive leakage current and outputting an alarm signal if the value of the resistive leakage current is greater than the stored alarm current reference value; And an alarm for alarming by the alarm signal output by the comparator.

누전차단기에 의해 검출되는 영상전류는 도 6과 같은 성분을 갖는다. The image current detected by the earth leakage breaker has a component as shown in FIG.

실제로 절연 저하에 의해 발생되는 누설전류를 Igr 성분이다. 그러나, 현재 감시하고 있는 성분은 Ig로 절연상태와 관계없는 용량성 누설전류인 Igc성분을 포함하고 있다.In fact, the leakage current generated by the insulation deterioration is the Igr component. However, the component currently being monitored is Ig, which contains the Igc component, which is a capacitive leakage current independent of the insulation state.

대부분의 디지털 부하는 스위칭방식의 전원공급기를 채용하고 있다.Most digital loads employ switched power supplies.

이런 종류의 전원공급기는 전압변환과정에서 많은 노이즈를 발생시키기 때문에 노이즈필터를 내장한다. 노이즈필터는 일반적으로 인덕턴스와 커패시턴스 성분으로 구성되며, 커패시턴스 성분은 반도체의 스위칭 과정에서 발생되는 노이즈를 대지로 방류시키는 역할을 한다.This type of power supply generates a lot of noise during the voltage conversion process, so it has a built-in noise filter. Noise filter is generally composed of inductance and capacitance components, the capacitance component serves to discharge the noise generated during the switching process of the semiconductor to the ground.

과거에는 용량성 누설전류가 전선과 대지간의 정전용량에 의해 주로 발생되었지만, 최근 디지털부하의 폭발적 확산에 의해 대부분의 대지와 전원사이의 정전용량은 노이즈필터의 커패시턴스 성분으로 변화되었다.In the past, capacitive leakage current was mainly caused by the capacitance between the wire and the ground, but recently, due to the explosion of the digital load, the capacitance between the ground and the power source has been changed into the capacitance component of the noise filter.

이로 인해 대지와 선로 사이의 정전용량이 과거에 비해 현저히 증가하였으며, 증가된 용량성분에 의한 누설전류에 의해 누전차단기의 원하지 않는 차단현상도 유발되고 있다.As a result, the capacitance between the ground and the line has increased significantly compared with the past, and the unwanted current leakage circuit breaker is also caused by the leakage current caused by the increased capacitance component.

이 때문에 누전차단기의 전기재해 예방에 대한 유용성에도 불구하고 차단기를 사용하지 않는 회로가 증가하게 되었다. 그리고 절연저항이 부적합한 수용가는 누전차단기가 적절하게 보호하지 않으면, 전기재해로 확산될 수 있는 개연성이 높은 수용가가 많다는 것을 의미한다. 따라서 이런 문제를 해결하기 위해 절연저항에 비례하는 유효누설전류를 감시하는 것이 필요하다.
This has led to an increase in the number of circuits that do not use circuit breakers, despite their usefulness in preventing electrical accidents. And an inadequate insulation resistance means that there are many highly likely customers that can spread to electrical disasters unless the earth leakage breaker is properly protected. Therefore, to solve this problem, it is necessary to monitor the effective leakage current proportional to the insulation resistance.

본 발명의 목적은 전술한 점을 감안하여 안출된 것으로, 댁내에서 설치되는 차단기로부터 측정된 유효누설전류를 무선통신을 통해 외부에서 확인할 수 있도록 누설전류를 분석하는 누설전류 분석장치를 제공함에 있다.
Disclosure of Invention An object of the present invention is to provide a leakage current analysis device for analyzing the leakage current so that the effective leakage current measured from the breaker installed in the home from the outside through wireless communication.

본 발명은 누설전류 분석장치에 있어서, 전압을 입력받아 계기용 변압기(PT)를 통해 감압된 전압의 고조파 및 노이즈를 제거하는 필터부(110); 필터부의 출력을 입력받아 전압 위상을 검출하는 제1 위상 검출부(120); 영상변류기(ZCT)를 이용하여 전원선과 중성선의 외부에 설치하여 전류 차이를 측정하는 누설전류 측정부(130); 누설전류 측정부의 출력을 입력받아 증폭회로로 증폭시키고, 고조파 및 노이즈가 제거된 전류 위상을 검출하는 제2 위상 검출부(140); 검출된 전압위상과 전류위상을 이용하여 위상각을 산출하고, 영상전류(Io)와의 위상각으로 저항성 누설전류(Igr)와 용량성 누설전류(Igc)를 측정하여 출력하는 위상각 측정부(150); 및 상기 위상각 측정부의 출력을 외부 단말로 전달하는 통신부(160);를 포함한다.The present invention provides a leakage current analysis device comprising: a filter unit (110) for receiving a voltage to remove harmonics and noise of a voltage reduced by a transformer (PT) for an instrument; A first phase detector 120 which receives an output of the filter unit and detects a voltage phase; A leakage current measuring unit 130 installed outside the power line and the neutral line by using a current transformer ZCT to measure a current difference; A second phase detection unit 140 which receives an output of the leakage current measuring unit and amplifies the leakage current measuring unit, and detects a current phase from which harmonics and noise are removed; The phase angle measuring unit 150 calculates a phase angle using the detected voltage phase and the current phase, and measures and outputs the resistive leakage current Igr and the capacitive leakage current Igc based on the phase angle with the image current Io. ); And a communication unit 160 for transmitting the output of the phase angle measuring unit to an external terminal.

바람직하게 위상각 측정부는 아날로그 전압을 측정하여 디지털 값으로 변환하는 A/D 컨버터;를 더 포함하는 것을 특징으로 한다.Preferably, the phase angle measuring unit further comprises an A / D converter which measures an analog voltage and converts it into a digital value.

그리고 바람직하게 제1 및 제2 위상검출부는 전압 또는 전류의 제로크로싱 점을 검출하여 전압과 전류의 위상차를 검출하는 것을 특징으로 한다.
Preferably, the first and second phase detectors detect a zero crossing point of the voltage or the current to detect the phase difference between the voltage and the current.

상술한 바와 같이 본 발명에 의하면, 측정된 유효누설전류를 무선통신을 통해 외부에서 확인할 수 있도록 누설전류를 분석할 수 있는 효과가 있다.
As described above, according to the present invention, there is an effect of analyzing the leakage current so that the measured effective leakage current can be confirmed from the outside through wireless communication.

도 1은 본 발명의 일실시예에 따른 누설전류 분석장치의 전체 구성도이며,
도 2는 본 발명의 일실시예에 따른 누설전류 분석장치의 블록 예시도이고,
도 3은 본 발명의 일실시예에 따른 누설전류 분석장치의 측정결과를 나타낸 그래프이며,
도 4는 차단기를 포함하는 계략적인 전체시스템 예를 나타낸 도면이고,
도 5은 본 발명의 일실시예에 따른 누설전류 분석방법을 나타낸 흐름도이다.
도 6은 영상전류의 성분을 나타낸 예시도이다.1 is an overall configuration diagram of a leakage current analysis device according to an embodiment of the present invention,
2 is a block diagram of an apparatus for analyzing leakage current according to an embodiment of the present invention;
Figure 3 is a graph showing the measurement results of the leakage current analysis device according to an embodiment of the present invention,
4 is a diagram illustrating an exemplary overall system including a breaker;
5 is a flowchart illustrating a leakage current analysis method according to an embodiment of the present invention.
6 is an exemplary diagram illustrating components of an image current.

이하, 본 발명에 첨부한 예시도면을 참조하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to exemplary drawings attached hereto.

도 1은 본 발명의 일실시예에 따른 누설전류 분석장치의 전체 구성도이며, 도 2는 본 발명의 일실시예에 따른 누설전류 분석장치의 블록 예시도이고, 도 3은 본 발명의 일실시예에 따른 누설전류 분석장치의 측정결과를 나타낸 그래프이며, 도 4는 차단기를 포함하는 계략적인 전체시스템 예를 나타낸 도면이고, 도 5은 본 발명의 일실시예에 따른 누설전류 분석방법을 나타낸 흐름도이며, 도 6은 영상전류의 성분을 나타낸 예시도이다.1 is an overall configuration diagram of a leakage current analysis device according to an embodiment of the present invention, Figure 2 is a block diagram of a leakage current analysis device according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention 4 is a graph showing a measurement result of the leakage current analysis device according to an example, Figure 4 is a view showing an example of a schematic overall system including a circuit breaker, Figure 5 is a flow chart showing a leakage current analysis method according to an embodiment of the present invention 6 is an exemplary diagram illustrating components of an image current.

도 1에 도시된 바와 같이, 본 발명에 따른 누설전류 분석장치는 필터부(110), 제1 위상 검출부(120), 누설전류 측정부(130), 제2 위상 검출부(140), 위상각 측정부(150), 통신부(160)를 포함한다.As shown in FIG. 1, the leakage current analyzing apparatus according to the present invention includes a filter unit 110, a first phase detector 120, a leakage current measurer 130, a second phase detector 140, and a phase angle measurement. The unit 150 and the communication unit 160 is included.

필터부(110)는 전압을 입력받아 계기용 변압기(PT)를 통해 감압된 전압의 고조파 및 노이즈를 제거하는 구성이다.The filter unit 110 receives the voltage and removes harmonics and noise of the voltage reduced through the instrument transformer PT.

제1 위상 검출부(120)는 필터부의 출력을 입력받아 기본 주파수의 전압만 통과시켜 전압 위상을 검출할 수 있다.The first phase detector 120 may receive the output of the filter unit and detect a voltage phase by passing only a voltage having a fundamental frequency.

누설전류 측정부(130)는, 영상변류기(ZCT)를 이용하여 전원선과 중성선의 외부에 설치하여 전류 차이를 측정할 수 있다.The leakage current measuring unit 130 may be installed outside the power line and the neutral line by using a current transformer (ZCT) to measure the current difference.

제2 위상 검출부(140)는 누설전류 측정부의 출력을 입력받아 증폭회로로 증폭시키고, 기본 주파수의 전류만 통과시켜 전류 위상을 검출하는 구성이다.The second phase detection unit 140 receives the output of the leakage current measuring unit and amplifies the amplification circuit, and passes only a current having a fundamental frequency to detect a current phase.

위상각 측정부(150)는 검출된 전압위상과 전류위상을 이용하여 위상각을 산출하고, 영상전류(Io)와의 위상각으로 저항성 누설전류(Igr)와 용량성 누설전류(Igc)를 측정하여 출력할 수 있다.The phase angle measuring unit 150 calculates the phase angle using the detected voltage phase and the current phase, and measures the resistive leakage current Igr and the capacitive leakage current Igc by the phase angle with the image current Io. You can print

여기서, 위상각 측정부는 아날로그 전압을 측정하여 디지털 값으로 변환하는 A/D 컨버터를 포함하는 것을 특징으로 한다.The phase angle measuring unit may include an A / D converter that measures an analog voltage and converts the analog voltage into a digital value.

이때, 측정결과는 도 3에 도시된 바와 같이, 참값과 측정한 계측값을 그래프로 나타내보면, 정확한 절연상태를 확인할 수 있다.In this case, as shown in FIG. 3, when the true value and the measured measurement value are represented by a graph, an accurate insulation state can be confirmed.

그리고 통신부(160)는 위상각 측정부의 출력을 외부 단말로 전달하는 구성이다. 여기서, 통신부는 지그비 또는 블루투스를 통해 PDA나 스마트폰과 같은 외부 단말로 전달할 수 있도록 한다.And the communication unit 160 is a configuration for transmitting the output of the phase angle measuring unit to the external terminal. Here, the communication unit may be transmitted to an external terminal such as a PDA or a smartphone through Zigbee or Bluetooth.

본 실시예에 따른 누설전류 분석장치는 댁내에 설치되는 차단기로부터 측정된 유효 누설전류를 무선통신을 통해 외부에서 확인할 수 있도록 한다. 여기서, 도 4는 차단기를 포함하는 계략적인 전체시스템 예를 나타낸 도면이다.The leakage current analyzing apparatus according to the present embodiment allows the effective leakage current measured from the breaker installed in the home to be externally checked through wireless communication. 4 is a diagram illustrating an example of a schematic overall system including a circuit breaker.

본 발명의 일실시예에 따른 누설전류 분석방법을 도 5를 참조하여 설명하면 다음과 같다.The leakage current analysis method according to an embodiment of the present invention will be described with reference to FIG. 5.

필터부는 전압을 입력받아 계기용 변압기(PT)를 통해 감압된 전압의 고조파 및 노이즈를 제거하여 기본 주파수의 전압과 전류만을 통과시킨다(S2).The filter unit receives the voltage and removes harmonics and noise of the voltage reduced through the instrument transformer (PT) to pass only the voltage and current of the fundamental frequency (S2).

다음으로 제1 위상 검출부는 필터부의 출력을 입력받아 전압 위상을 검출한다(S4).Next, the first phase detector detects the voltage phase by receiving the output of the filter unit (S4).

다음으로 누설전류 측정부는 영상변류기(ZCT)를 이용하여 전원선과 중성선의 외부에 설치하여 전류 차이를 측정한다(S6).Next, the leakage current measuring unit is installed on the outside of the power line and the neutral line using the image current transformer (ZCT) to measure the current difference (S6).

다음으로 제2 위상 검출부는 누설전류 측정부의 출력을 입력받아 증폭회로로 증폭시키고, 기본 주파수의 전류만 통과시켜 전류 위상을 검출한다(S8).Next, the second phase detection unit receives the output of the leakage current measuring unit and amplifies the amplification circuit, and detects a current phase by passing only a current having a fundamental frequency (S8).

다음으로 위상각 측정부는 검출된 전압위상과 전류위상을 이용하여 위상각을 산출하고, 영상전류(Io)와의 위상각으로 저항성 누설전류(Igr)와 용량성 누설전류(Igc)를 측정하여 출력한다(S10).Next, the phase angle measuring unit calculates the phase angle using the detected voltage phase and the current phase, and measures and outputs the resistive leakage current Igr and the capacitive leakage current Igc using the phase angle with the image current Io. (S10).

여기서, S10 단계에서 위상각 측정부는 아날로그 전압을 측정하여 디지털 값으로 변환하여 출력할 수도 있다.Here, in step S10, the phase angle measuring unit may measure an analog voltage, convert it to a digital value, and output the digital value.

그리고 통신부는 위상각 측정부의 출력을 외부 단말로 전달한다(S12).The communication unit transmits the output of the phase angle measuring unit to the external terminal (S12).

제 S4 단계와 제 S8 단계에서, 제1 및 제2 위상검출부는 전류 및 전압의 제로크로싱 점을 검출하여 전압 또는 전류의 위상차를 검출하는 것을 특징으로 한다.
In steps S4 and S8, the first and second phase detectors detect a current and a zero crossing point of the voltage to detect a voltage or a phase difference of the current.

참고로, 본 발명의 일실시예에 따른 누설전류 분석장치에 대한 부연설명을 하면 다음과 같다.For reference, further description of the leakage current analysis device according to an embodiment of the present invention.

누전 차단기에 의해 검출되는 영상전류는 도 6과 같은 성분을 갖는다. 실제로 절연 저하에 의해 발생되는 누설전류는 Igr성분이다. 그러나 현재 감시하고 있는 성분은 Ig로 절연상태와 관계없는 용량성 누설전류인 Igc 성분을 포함하고 있다.The image current detected by the ground fault breaker has a component as shown in FIG. In fact, the leakage current generated by the insulation deterioration is an Igr component. However, the current monitored component is Ig, which contains the Igc component, a capacitive leakage current independent of insulation.

상용 전원은 60Hz의 교류로 1초에 60번을 주기로 교번하게 되는데, 이때 1초 동안 120회 전위가 0이 된다. 위상 검출은 바로 이 전압 및 전류의 제로크로싱 점을 검출하여 전압과 전류의 위상차를 검출하고 이를 분석하는 것이다. 이를 통해 용량성 전류에 의한 영상 전류를 배제하고 표시할 수 있다.The commercial power supply alternates with a cycle of 60 times in an alternating current of 60 Hz, with 120 potentials being zero for 1 second. Phase detection is to detect this zero crossing point of voltage and current to detect and analyze the phase difference between voltage and current. This can exclude and display the image current caused by the capacitive current.

본 발명의 일실시예에 따른 누설전류 분석장치는 전압을 입력받아 PT를 통해 감압된 전압의 고조파 및 노이즈를 필터에서 제거하고, 기본 주파수의 전압만 통과시켜 전압 위상을 검출하며, 위상각 측정부에서 아날로그 전압을 측정하여 A/D컨버터에서 디지털 값으로 변환한다.Leakage current analysis device according to an embodiment of the present invention receives the voltage to remove the harmonics and noise of the voltage reduced through the PT in the filter, detects the voltage phase by passing only the voltage of the fundamental frequency, phase angle measuring unit Measure analog voltage at and convert to digital value at A / D converter.

또한, 선간 전압의 측정과 동시에 누설전류를 측정하기 위해 ZCT를 이용하여 전원선과 중성선의 외부에 설치하여 전류차이를 측정하여, 증폭회로에서 증폭시키고, 고조파 및 노이즈 제거필터에서 기본 주파수의 전류만 통과시켜 전류위상 검출부에서 전류의 위상을 검출한다.Also, in order to measure the voltage between lines and measure leakage current, it is installed on the outside of power line and neutral line by using ZCT to measure the current difference and amplify it in amplification circuit, and pass only the current of fundamental frequency in harmonic and noise removing filter. The phase of the current is detected by the current phase detection unit.

이 검출된 전압위상과 전류위상을 이용하여 위상각을 계산하고 Io와의 위상각을 이용하여 Igr과 Igc를 계산함으로써 정확한 절연상태를 확인할 수 있다. 도 3은 누설전류 분석장치로 측정된 값으로, 높은 정확도를 갖는 것을 알 수 있다.The correct insulation state can be confirmed by calculating the phase angle using the detected voltage phase and the current phase and calculating Igr and Igc using the phase angle with Io. 3 is a value measured by the leakage current analyzer, it can be seen that it has a high accuracy.

이러한 본 발명에 따르면, 4분/호의 절연저항 측정을 위한 정전 절차를 배제할 수 있어서 정전에 대한 민원 및 생산성 향상에 기여할 수 있을 것이고, 현재 절연저항 측정 시 부하설비는 포함시키지 않지만, 누설전류를 이용하여 절연을 확인할 경우 전원에 연결 및 접지된 부하설비는 절연이 확인될 수 있다는 장점이 있다.
According to the present invention, it is possible to exclude the blackout procedure for measuring the insulation resistance of 4 minutes / arc, which may contribute to civil complaints and productivity improvement of the power failure, and does not include the load equipment in the current insulation resistance measurement, When checking the insulation by using the load facility connected to and grounded has the advantage that the insulation can be confirmed.

110 : 필터부 120 : 제1 위상 검출부
130 : 누설전류 측정부 140 : 제2 위상 검출부
150 : 위상각 측정부 160 : 통신부110 filter unit 120 first phase detection unit
130: leakage current measuring unit 140: second phase detection unit
150: phase angle measurement unit 160: communication unit

Claims (3)

댁내에 설치되는 차단기로부터 측정된 유효 누설전류를 무선통신을 통해 외부에서 확인할 수 있도록 하는 누설전류 분석장치에 있어서,
전압을 입력받아 계기용 변압기(PT)를 통해 감압된 전압의 고조파 및 노이즈를 제거하는 필터부;
필터부의 출력을 입력받아 전압 위상을 검출하는 제1 위상 검출부;
선간 전압의 측정과 동시에 누설전류를 측정하기 위해 영상변류기(ZCT)를 전원선과 중성선의 외부에 설치하여 전류 차이를 측정하는 누설전류 측정부;
누설전류 측정부의 출력을 입력받아 증폭회로로 증폭시키고, 고조파 및 노이즈가 제거된 전류 위상을 검출하는 제2 위상 검출부;
검출된 전압위상과 전류위상을 이용하여 위상각을 산출하고, 영상전류(Io)와의 위상각으로 저항성 누설전류(Igr)와 용량성 누설전류(Igc)를 측정한 아날로그 값을 A/D컨버터를 통해 디지털 값으로 변환하여 출력하는 위상각 측정부; 및
상기 위상각 측정부의 출력을 지그비 또는 블루투스를 통해 PDA 또는 스마트폰으로 전달하는 통신부;를 포함하며,
상기 제1 및 제2 위상검출부는 60Hz의 교류로 1초에 60번을 주기로 교번하는 상용전원에서 1초 동안 120회 전위가 0가 되는 제로크로싱 점을 검출하여 전압 또는 전류의 위상차를 검출하는 것을 특징으로 하는 누설전류 분석장치.In the leakage current analysis device to check the effective leakage current measured from the breaker installed in the home through wireless communication,
A filter unit which receives a voltage and removes harmonics and noise of a voltage reduced through an instrument transformer PT;
A first phase detector configured to receive an output of the filter unit and detect a voltage phase;
Leakage current measuring unit for measuring the current difference by installing a current transformer (ZCT) on the outside of the power line and the neutral line to measure the leakage current at the same time to measure the line voltage;
A second phase detector which receives the output of the leakage current measurer and amplifies the amplifier by an amplification circuit and detects a current phase from which harmonics and noise are removed;
The phase angle is calculated using the detected voltage phase and the current phase, and the analog value obtained by measuring the resistive leakage current (Igr) and the capacitive leakage current (Igc) is measured using the phase angle with the image current (Io). Phase angle measuring unit for converting the digital value through the output; And
And a communication unit configured to transfer the output of the phase angle measuring unit to a PDA or a smartphone through Zigbee or Bluetooth.
The first and second phase detectors detect a zero crossing point at which the potential becomes zero for 120 times in one second in a commercial power supply alternated at 60 times per second with an alternating current of 60 Hz to detect a phase difference of voltage or current. Leakage current analysis device characterized in that. 삭제delete 삭제delete
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101877799B1 (en) * 2017-12-28 2018-07-13 에이디파워 주식회사 Device for Detecting Insulation Resistance
CN108957110A (en) * 2018-05-21 2018-12-07 安徽国电京润电力科技有限公司 A kind of instantaneous value measurement method of substation bus bar voltage phase angle dynamic
WO2019117435A1 (en) * 2017-12-12 2019-06-20 에이디파워 주식회사 Zero-phase current transformer for measuring three-phase four-wire live wire insulation resistance, and live wire insulation resistance measurement device
KR102054937B1 (en) * 2018-09-27 2019-12-12 에이디파워 주식회사 Device for Detecting Insulation Resistance
GB2580060A (en) * 2018-12-20 2020-07-15 Bombardier Primove Gmbh A method and system for determining a phase shift between a phase current and a phase voltage

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080093169A (en) * 2007-04-16 2008-10-21 김형열 Method of leakage current break and measurement leakage current use phase calculation
KR20090055782A (en) * 2007-11-29 2009-06-03 (주)엔텍시스템 Watt-hour meter having the function for sensing electric leakage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080093169A (en) * 2007-04-16 2008-10-21 김형열 Method of leakage current break and measurement leakage current use phase calculation
KR20090055782A (en) * 2007-11-29 2009-06-03 (주)엔텍시스템 Watt-hour meter having the function for sensing electric leakage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019117435A1 (en) * 2017-12-12 2019-06-20 에이디파워 주식회사 Zero-phase current transformer for measuring three-phase four-wire live wire insulation resistance, and live wire insulation resistance measurement device
CN111465863A (en) * 2017-12-12 2020-07-28 Ad电力株式会社 Zero-phase converter for measuring three-phase four-wire type live insulation resistance and live insulation resistance measuring device
KR101877799B1 (en) * 2017-12-28 2018-07-13 에이디파워 주식회사 Device for Detecting Insulation Resistance
CN108957110A (en) * 2018-05-21 2018-12-07 安徽国电京润电力科技有限公司 A kind of instantaneous value measurement method of substation bus bar voltage phase angle dynamic
KR102054937B1 (en) * 2018-09-27 2019-12-12 에이디파워 주식회사 Device for Detecting Insulation Resistance
GB2580060A (en) * 2018-12-20 2020-07-15 Bombardier Primove Gmbh A method and system for determining a phase shift between a phase current and a phase voltage

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