KR20040091375A - Circuit and method for detecting ground - Google Patents
Circuit and method for detecting ground Download PDFInfo
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- KR20040091375A KR20040091375A KR1020030025192A KR20030025192A KR20040091375A KR 20040091375 A KR20040091375 A KR 20040091375A KR 1020030025192 A KR1020030025192 A KR 1020030025192A KR 20030025192 A KR20030025192 A KR 20030025192A KR 20040091375 A KR20040091375 A KR 20040091375A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q30/00—Commerce
- G06Q30/02—Marketing; Price estimation or determination; Fundraising
- G06Q30/0241—Advertisements
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D5/00—Special constructions of flushing devices, e.g. closed flushing system
- E03D5/10—Special constructions of flushing devices, e.g. closed flushing system operated electrically, e.g. by a photo-cell; also combined with devices for opening or closing shutters in the bowl outlet and/or with devices for raising/or lowering seat and cover and/or for swiveling the bowl
- E03D5/105—Special constructions of flushing devices, e.g. closed flushing system operated electrically, e.g. by a photo-cell; also combined with devices for opening or closing shutters in the bowl outlet and/or with devices for raising/or lowering seat and cover and/or for swiveling the bowl touchless, e.g. using sensors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
- G06F3/1431—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display using a single graphics controller
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/147—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
Abstract
Description
본 발명은 지락 검출회로에 관한 것으로, 더욱 상세하게는 비접지 계통의 배전선로의 지락 및 단락사고점을 검출할 수 있도록 한 지락 검출 회로 및 방법에 관한 것이다.The present invention relates to a ground fault detection circuit, and more particularly, to a ground fault detection circuit and a method for detecting a ground fault and a short circuit fault point of a distribution line of an ungrounded system.
일반적으로, 1960년대 후반 이후 우리나라의 배전전압은 대개 22.9kV로 다중 접지방식을 채택하고 있다. 지락사고시 발생하는 사고전류는 접지로 귀환되며, 이때 중성선에 흐르는 전류는 상당히 큰 값을 가지므로 보통 지락 과전류 계전기를 사용하여 사고를 차단한다. 따라서, 지락계전기의 신뢰성은 매우 중요하다고 할 수 있다.In general, since the late 1960s, Korea's distribution voltage has generally been 22.9kV, adopting multiple grounding methods. In case of ground fault, the fault current is returned to ground. At this time, the current flowing through the neutral wire has a very large value. Therefore, the ground fault overcurrent relay is used to block the fault. Therefore, it can be said that the reliability of the ground fault relay is very important.
이에, 종래에는 25.8kV 배전계통의 부하 개폐기에 계통보호를 위한 지락 검출회로는 부하단의 전압과 전류를 계측하고 단락 사고 및 결상등에 의한 사고시 고장점을 판단하여 상위로 정보를 전송하는 역할을 함으로써, 배전 자동화 시스템에 의한 사고점을 분석하여 단말장치를 통한 고장구간 분리 및 건전상 유지등의 처리하는 것으로, 이와 같은 종래의 기술을 첨부한 도면을 참조하여 설명하면 다음과 같다.Thus, conventionally, a ground fault detection circuit for protecting a circuit in a load switch of a 25.8 kV distribution system measures voltage and current at a load stage, determines a failure point in case of an accident due to a short circuit or an open phase, and transmits information to a higher level. By analyzing the accident point by the distribution automation system, such as the separation of the fault zones and the maintenance of the sound phase through the terminal device, described with reference to the accompanying drawings, such as the prior art.
도 1은 종래 지락 검출장치의 구성을 보인 예시도로서, 이에 도시한 바와 같이 3상 4선식의 Y결선에서 배전선로의 계측된 전류 및 전압을 이용하여 지락사고의 유무를 판단하는 전류, 전압을 측정함에 있어서, 각 상에 입력되는 전압/전류를 일정비율로 변환하는 전류/전압 측정부(1a)와; 상기 전류/전압 측정부(1a)의 출력 전압을 소정 증폭하여 출력하는 증폭기(1b)와; 상기 증폭기(1b)의 출력을 선택출력하는 멀티플렉서(1c)와; 상기 멀티플렉서(1c)의 아날로그 출력신호를 디지털로 변환하는 A/D변환부(1d)로 구성된 것으로, 이와 같이 구성된 종래 장치의 동작을 설명하면 다음과 같다.1 is an exemplary view showing the configuration of a conventional ground fault detection device. As shown in FIG. 1, a current and voltage for determining the presence of a ground fault are determined by using the measured current and voltage of a distribution line in a three-phase four-wire type Y connection. In the measurement, the current / voltage measuring unit (1a) for converting the voltage / current input to each phase to a constant ratio; An amplifier 1b for amplifying and outputting the output voltage of the current / voltage measuring unit 1a; A multiplexer (1c) for selectively outputting the output of the amplifier (1b); The A / D converter 1d converts the analog output signal of the multiplexer 1c into digital. The operation of the conventional apparatus configured as described above will be described below.
종래의 동작 설명을 위해 도 2를 참조하여 설명한다.It will be described with reference to Figure 2 for explaining the conventional operation.
먼저, 전류/전압 측정부(1)는 배전 계통의 전압과 전류를 CT/PT를 통해 배전선로의 전류/전압을 2차측에 유기시키고 저항(R1~R3, R17)을 통해 분압된 전압을 각 상에 연결된 오피 엠프(U1A~U1C)로 입력하여 일정한 전압 레벨로 변환한다.First, the current / voltage measuring unit 1 induces the voltage and current of the distribution system to the secondary side through CT / PT and divides the voltage divided by the resistors R1 to R3 and R17. Input to op amps (U1A ~ U1C) connected to the phase to convert to a constant voltage level.
상기 오피 엠프(U1A~UQC)의 출력전압은 멀티플렉서(1c), A/D변환부(1d)를 통해 아날로그 신호를 디지털로 변환하여 전용 디지털 신호를 처리하는 FI연산부(2)로 입력된다.The output voltages of the op amps U1A to UQC are input to a FI operator 2 which converts an analog signal to digital through a multiplexer 1c and an A / D converter 1d to process a dedicated digital signal.
이후, 상기 FI연산부(2)에 의해 연산된 데이터는 메인 DSP부(3)와 DMA통신을 하고, 그 메인 DSP부(3)는 중앙처리부(CPU)(4)와 어드레스 버스(ADDRESS BUS), 데이터 버스(DATA BUS)를 통해 상호 데이터 통신을 한후, 표시부(5)를 통해 계측값을 표시함과 아울러, 메모리부(7)에 그 계측값을 저장한다. 이때, 통신부(6)는 상기 데이터를 상위 시스템으로 전송한다.Thereafter, the data calculated by the FI operation unit 2 performs DMA communication with the main DSP unit 3, and the main DSP unit 3 has a central processing unit (CPU) 4, an address bus (ADDRESS BUS), After performing data communication with each other via the data bus, the measured values are displayed on the display unit 5 and the measured values are stored in the memory unit 7. At this time, the communication unit 6 transmits the data to the host system.
상술한 바와 같은 과정에 의해 지락사고가 발생했다고 판단이 되면, 도 3의 B구간의 전류, 전압파형과 같이 변화하게 된다.If it is determined that a ground fault has occurred by the above-described process, the current and voltage waveforms of section B of FIG. 3 are changed.
즉, 지락 또는 단락사고 발생시, 전압보다는 전류의 크기가 많이 변한다. 따라서, 접지 계통에서의 사고 검출은 증폭기(1b)의 오피 엠프단을 통해 입력되는 값의 크기로 판단하게 된다.That is, when a ground fault or a short circuit occurs, the magnitude of the current changes more than the voltage. Therefore, the accident detection in the ground system is determined by the magnitude of the value input through the op amp stage of the amplifier 1b.
그러나, 상기와 같이 동작하는 종래 장치는 접지 계통에서의 지락(단락) 사고등의 고장 발생시, 전압 특히 전류 변화의 크기로 판단하기 때문에 고장 검출이 가능하지만, 비접지 계통(△결선)에서는 단락 및 지락 사고 발생시 전압과 전류의 변화가 미미하기 때문에 3상 4선식(Y결선) 전류/전압 측정부로 고장 판단이 불가능한 문제점이 있었다.However, in the conventional apparatus operating as described above, when a fault such as a ground fault (short circuit) occurs in the ground system, it is possible to detect the fault because it is determined by the magnitude of the voltage, in particular, the current change. In case of ground fault, the voltage and current change are insignificant, so it is impossible to determine the failure by using the three-phase 4-wire (Y-connected) current / voltage measurement unit.
따라서, 본 발명은 상기와 같은 문제점을 해결하기 위하여 창안한 것으로, 전압 계측용인 PT를 복권식으로 구성하여 지락사고 및 단락사고가 발생하지 않을경우의 전압, 전류를 계측하고, 지락사고 및 단락사고가 발생할경우의 전압 및 전류를 검출하여 지락 사고의 유무를 쉽게 판단함으로써, 지락 과전압 계전기를 이용한 검출 방식을 적용하여 선로를 보호하거나, 지락 사고시 영상 전압과 영상 전류의 곱으로 동작하는 선택 지락 계전기를 적용하지 못하는 부하 개폐기의 구조상 이러한 계전기를 내장할 수 없는 경우에도 쉽게 적용할 수 있도록 한 지락 검출 회로 및 방법을 제공함에 그 목적이 있다.Therefore, the present invention was devised to solve the above problems, and by constructing a lottery type PT for voltage measurement, it measures voltage and current when a ground fault and a short circuit do not occur, and a ground fault and a short circuit By detecting the voltage and current in the event of an earth fault, it is easy to determine whether there is a ground fault.The detection method using the ground fault overvoltage relay is applied to protect the line, or in case of a ground fault, select the ground fault relay It is an object of the present invention to provide a ground fault detection circuit and method that can be easily applied even when such a relay cannot be built due to the structure of a load switch that is not applicable.
도 1은 종래 지락 검출장치의 구성을 보인 예시도.1 is an exemplary view showing a configuration of a conventional ground fault detection device.
도 2는 종래 지락 검출장치의 구성을 보인 예시도.Figure 2 is an exemplary view showing the configuration of a conventional ground fault detection device.
도 3은 종래 지락 검출장치의 지락 및 단락 사고시의 파형을 보인 파형도.3 is a waveform diagram showing waveforms during a ground fault and a short circuit accident of the conventional ground fault detection apparatus.
도 4는 본 발명 지락 검출회로에 대한 구성을 보인 예시도.Figure 4 is an exemplary view showing a configuration for the ground fault detection circuit of the present invention.
도 5는 본 발명 지락 검출회로에 대한 구성을 보인 예시도.5 is an exemplary view showing a configuration of the ground fault detection circuit of the present invention.
***도면의 주요부분에 대한 부호의 설명****** Explanation of symbols for main parts of drawing ***
41: 전압/전류 측정부 42: 필터부41: voltage / current measuring unit 42: filter unit
43: A/D 변환부 44: 정류부43: A / D converter 44: rectifier
45: 비교기 45a: 비교부45: comparator 45a: comparator
45b: 인버터 45c: 포토 커플러45b: inverter 45c: photo coupler
46: 연산부 47: 메인 DSP부46: calculator 47: main DSP unit
48: 통신부 49: CPU48: communication unit 49: CPU
50: 표시부 51: 메모리부50: display unit 51: memory unit
상기와 같은 목적을 달성하기 위한 본 발명은, 비접지 계통의 배전선로의 지락사고의 유무를 판단하는 전류, 전압을 측정함에 있어서, 평상시, 지락 및 단락사고시 배전선로에 흐르는 전압, 전류를 계측하기 위한 복권으로 이루어진 전압/전류 측정부와; 평상시 상기 전압/전류 측정부의 출력전압/전류의 고조파 및 노이즈를 필터링하여 출력하는 필터부와; 상기 필터부의 출력신호를 디지털로 변환하는 A/D 변환부와; 지락 및 단락사고시, 상기 전압/전류 측정부의 출력전압을 정류하는 정류부와; 상기 정류부의 출력전압을 기준전압과 비교하여 그에 따른 영상전압 검출 인터럽트 신호로 출력하는 비교기로 구성된 것을 특징으로 한다.The present invention for achieving the above object, in the measurement of the current, the voltage to determine the presence or absence of a ground fault of the distribution line of the non-grounded system, to measure the voltage, current flowing in the distribution line during normal, ground fault and short circuit accident A voltage / current measuring unit comprising a lottery ticket; A filter unit which filters and outputs harmonics and noise of an output voltage / current of the voltage / current measuring unit at normal times; An A / D converter converting the output signal of the filter unit into digital; A rectifying unit rectifying the output voltage of the voltage / current measuring unit in a ground fault and a short circuit accident; And a comparator configured to compare the output voltage of the rectifier with a reference voltage and output the video voltage detection interrupt signal accordingly.
상기와 같은 목적을 달성하기 위한 본 발명은, 비접지 계통의 배전선로의 지락 및 단락사고를 검출함에 있어서, 배전선로의 전압 및 전류를 검출하는 제1 단계와; 상기 검출된 전압이 임계 영상전압보다 큰가를 판단하여, 그 검출된 전압이 임계 영상전압보다 크면 영상전압 연산 인터럽트 신호를 발생하는 제2 단계로 이루어진 것을 특징으로 한다.The present invention for achieving the above object, the first step of detecting a ground fault and a short circuit accident of the distribution line of the ungrounded system, detecting the voltage and current of the distribution line; And determining whether the detected voltage is greater than the threshold image voltage, and generating a video voltage operation interrupt signal when the detected voltage is greater than the threshold image voltage.
이하, 본 발명에 따른 일실시예를 첨부한 도면을 참조하여 상세히 설명하면 다음과 같다.Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.
도 4는 본 발명 지락 검출회로에 대한 구성을 보인 예시도로서, 이에 도시된 바와 같이 비접지 계통의 배전선로의 지락사고의 유무를 판단하는 전류, 전압을 측정함에 있어서, 평상시, 지락 및 단락사고시 배전선로에 흐르는 전압, 전류를 계측하기 위한 복권으로 이루어진 전압/전류 측정부(41)와; 평상시 상기 전압/전류 측정부(41)의 출력전압/전류의 고조파 및 노이즈를 필터링하여 출력하는 필터부(42)와; 상기 필터부(42)의 출력신호를 디지털로 변환하는 A/D 변환부(43)와; 지락 및 단락사고시, 상기 전압/전류 측정부(41)의 출력전압을 정류하는 정류부(44)와; 상기 정류부()의 출력전압을 기준전압과 비교하여 그에 따른 영상전압 검출 인터럽트 신호로 출력하는 비교기(45)로 구성된 것으로, 이와 같이 구성된 본 발명의 동작 및 작용을 설명하기 위해 도 5를 참조하여다음과 같다.Figure 4 is an exemplary view showing the configuration of the ground fault detection circuit of the present invention, as shown in the current, voltage to determine whether there is a ground fault of the distribution line of the non-grounded system, in normal, ground and short circuit accident A voltage / current measuring unit 41 made of a lottery for measuring the voltage and current flowing through the distribution line; A filter unit 42 for filtering and outputting harmonics and noise of the output voltage / current of the voltage / current measuring unit 41 at normal times; An A / D converter 43 for converting the output signal of the filter unit 42 into digital; A rectifier 44 for rectifying the output voltage of the voltage / current measuring unit 41 in a ground and short circuit accident; Comprising a comparator 45 for comparing the output voltage of the rectifying unit with a reference voltage and outputs the video voltage detection interrupt signal according to the present invention, to explain the operation and operation of the present invention configured as described above with reference to FIG. Same as
본 발명은 비접지 계통의 △결선과 같은 배전선로의 지락 및 단락사고를 검출하는 지락 검출회로로서, 먼저 배전선로의 전압 및 전류를 검출함에 있어, 전압/전류 측정부(41)는 1, 2차 변환비에 따라 2차측 전류와 전압은 일정한 크기의 전압으로 변환된다.The present invention is a ground fault detection circuit for detecting ground faults and short-circuit accidents in a distribution line such as a △ connection of an ungrounded system. First, in detecting voltage and current of a distribution line, the voltage / current measuring unit 41 has 1, 2 According to the difference conversion ratio, the secondary current and the voltage are converted into a constant voltage.
이때, 상기 전압/전류 측정부(41)는 복권식으로 하여 PT의 1차 AC100V, 2차 출력 전압은 4V/2V로 구분되어, PT의 2차측 복권식중 제1 권선은 정상전압을 계측하고, 제2 권선은 그 제2 권선의 출력전압을 이용하여 계통에 지락 및 단락사고가 발생하였는지 여부를 영상전압을 검출하여 판단하게 된다.At this time, the voltage / current measuring unit 41 is a lottery type, and the primary AC100V and the secondary output voltage of PT are divided into 4V / 2V, and the first winding of the secondary side lottery type of PT measures the normal voltage. The second winding may determine whether a ground fault or a short circuit has occurred in the system using the output voltage of the second winding by detecting an image voltage.
이에, 상기 제2 권선의 출력전압은 정류부(44)로 입력되어 정류 및 평활된 전압을 비교부(45a)로 출력한다.Thus, the output voltage of the second winding is input to the rectifier 44 to output the rectified and smoothed voltage to the comparator 45a.
그러면, 비교부(45a)는 정류부의 출력전압을 비교부(45a)의 기준전압과 비교하여 비교결과 기준전압보다 크면 '0', 기준전압보다 작으면 '1'이 출력된다.Then, the comparator 45a compares the output voltage of the rectifier with the reference voltage of the comparator 45a, and outputs '0' if the reference voltage is greater than the reference voltage and '1' if the reference voltage is smaller than the reference voltage.
이 결과값은 역전압을 방지하는 다이오드와 제너다이오드를 통해 인버터(45b)로 입력되고 반전되어 출력된다.The result is input to the inverter 45b through a diode and a zener diode which prevents reverse voltage, and is inverted and output.
그래서, 상기 인버터(45b)의 출력은 절연되어 오동작을 방지하는 포토 커플러(45c) 송신부의 포토 다이오드로 입력되고, 그 포토 다이오드의 점멸에 따라 수신부의 포토 트랜지스터가 동작하여 연산부(46)로 인터럽트 신호를 출력한다.Thus, the output of the inverter 45b is insulated and input to the photodiode of the photocoupler 45c transmitter which prevents malfunction, and the phototransistor of the receiver operates by the flashing of the photodiode to interrupt the operation unit 46. Outputs
이에의해, 상기 연산부(46)는 인터럽트 신호가 입력되면 지락 및 단락사고가 발생하지 않은 정상상태로 판단하여 정상상태시의 A/D 변환부(43)를 통해 입력되는 전압 및 전류를 이용하여 소정 연산하며, 상기 인터럽트 신호가 입력되지 않으면 지락 및 단락사고가 발생했다고 판단하여 연산부(46)를 통해 소정연산하여 고장점을 검출하게 된다.As a result, when the interrupt signal is input, the operation unit 46 determines that it is a normal state in which a ground fault and a short-circuit accident do not occur. If the interrupt signal is not input, it is determined that a ground fault or a short-circuit accident has occurred, and a predetermined operation is performed through the calculation unit 46 to detect a failure point.
이후, 상기 연산부(46)에 의해 연산된 데이터는 메인 DSP부(47)와 DMA통신을 하고, 그 메인 DSP부(47)는 중앙처리부(CPU)(49)와 어드레스 버스(ADDRESS BUS), 데이터 버스(DATA BUS)를 통해 상호 데이터 통신을 한후, 표시부(50)를 통해 계측값을 표시함과 아울러 그 계측값을 메모리부(51)에 저장한다. 이때, 통신부(48)는 상기 데이터를 상위 시스템으로 전송한다.Thereafter, the data calculated by the operation unit 46 performs DMA communication with the main DSP unit 47, and the main DSP unit 47 communicates with the central processing unit (CPU) 49, the address bus, and the data. After performing data communication with each other via the data bus, the measured value is displayed on the display unit 50 and the measured value is stored in the memory unit 51. At this time, the communication unit 48 transmits the data to the host system.
이상에서 상세히 설명한 바와 같이 본 발명은 전압 계측용인 PT를 복권식으로 구성하여 지락사고 및 단락사고가 발생하지 않을경우의 전압, 전류를 계측하고, 지락사고 및 단락사고가 발생할경우의 전압 및 전류를 검출하여 지락 사고의 유무를 쉽게 판단함으로써, 지락 과전압 계전기를 이용한 검출 방식을 적용하여 선로를 보호하거나, 지락 사고시 영상 전압과 영상 전류의 곱으로 동작하는 선택 지락 계전기를 적용하지 못하는 부하 개폐기의 구조상 이러한 계전기를 내장할 수 없는 경우에도 쉽게 적용할 수 있도록 함으로써, 배전 계통상에 신뢰성을 줄 수 있는 효과가 있다.As described in detail above, the present invention measures voltage and current when a ground fault and a short circuit accident are not formed by constructing a PT for voltage measurement in a lottery type, and measures voltage and current when a ground fault and a short circuit accident occur. By detecting the ground fault easily, it is possible to protect the line by applying the detection method using the ground fault overvoltage relay, or in the structure of the load switch which does not apply the selective ground fault relay operated by the product of the video voltage and the video current during the ground fault. Even if the relay can not be built, it can be easily applied, thereby providing an effect on reliability of the distribution system.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101490770B1 (en) * | 2013-12-04 | 2015-02-06 | 주식회사 포스코 | Ground fault detecting apparatus |
| KR20150138834A (en) * | 2015-11-19 | 2015-12-10 | 한전케이디엔주식회사 | Intelligent electronic charging/discharging measurement device and method for detecting line to ground fault location using the same |
| CN105277840A (en) * | 2015-11-18 | 2016-01-27 | 国网山东省电力公司莱芜供电公司 | Multi-line electric leakage synchronous detection device of 220V alternating current lines |
| CN108957299A (en) * | 2018-08-22 | 2018-12-07 | 国网江苏省电力有限公司盐城供电分公司 | A kind of multiple-level serially connected inversion detection tester for electronic circuit fault based on output signal acquisition |
-
2003
- 2003-04-21 KR KR10-2003-0025192A patent/KR100498557B1/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101490770B1 (en) * | 2013-12-04 | 2015-02-06 | 주식회사 포스코 | Ground fault detecting apparatus |
| CN105277840A (en) * | 2015-11-18 | 2016-01-27 | 国网山东省电力公司莱芜供电公司 | Multi-line electric leakage synchronous detection device of 220V alternating current lines |
| KR20150138834A (en) * | 2015-11-19 | 2015-12-10 | 한전케이디엔주식회사 | Intelligent electronic charging/discharging measurement device and method for detecting line to ground fault location using the same |
| CN108957299A (en) * | 2018-08-22 | 2018-12-07 | 国网江苏省电力有限公司盐城供电分公司 | A kind of multiple-level serially connected inversion detection tester for electronic circuit fault based on output signal acquisition |
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| KR100498557B1 (en) | 2005-07-01 |
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