KR102108138B1 - Method for measuring ground leakage current in an isolated neutral system and the system for same - Google Patents

Method for measuring ground leakage current in an isolated neutral system and the system for same Download PDF

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KR102108138B1
KR102108138B1 KR1020190132061A KR20190132061A KR102108138B1 KR 102108138 B1 KR102108138 B1 KR 102108138B1 KR 1020190132061 A KR1020190132061 A KR 1020190132061A KR 20190132061 A KR20190132061 A KR 20190132061A KR 102108138 B1 KR102108138 B1 KR 102108138B1
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South Korea
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branch
leakage current
image
current
branch part
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KR1020190132061A
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Korean (ko)
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구춘서
안영순
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주식회사 네오피스
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • 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
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • 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
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • 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 method of detecting a leakage current from a distribution board of a non-grounding system and a system thereof and, more specifically, to a method of detecting a leakage current from a distribution board of a non-grounding system, capable of determining a branch part, having a different direction of an image current delivered from a measuring instrument installed in each branch part, as a branch part in which a leak occurs. According to the present invention, the method of detecting a leakage current from a distribution board of a non-grounding system includes the following steps of: branching a distribution board of a non-grounding system into each branch part; installing an image converter in each branch part; installing a measuring instrument measuring an image current of the image converter installed in each branch part; and determining a branch part, having a different direction of an image current measured by the measuring instrument installed in each branch part, as a branch part in which a leak occurs.

Description

비접지 계통의 분전반 누설전류 검출방법 및 시스템{Method for measuring ground leakage current in an isolated neutral system and the system for same}Method and measuring ground leakage current in an isolated neutral system and the system for same}

본 발명은 비접지 계통의 분전반 누설전류 검출방법 및 시스템에 관한 것으로, 더욱 상세하게는 각 분기부에 설치된 계측기로부터 전달된 영상전류의 방향이 다른 분기부를 누설이 발생한 분기부로 판단하는 비접지 계통의 분전반 누설전류 검출방법 및 시스템에 관한 것이다.The present invention relates to a method and system for detecting a leakage current in a distribution panel of a non-grounding system, and more specifically, for a non-grounding system for determining a branch having a different direction of image current transmitted from an instrument installed in each branch as a branch having a leak. The present invention relates to a method and system for detecting leakage current in a distribution panel.

일반적으로 전선의 피복, 전기기기의 절연물이 노후화되거나 손상되어 절연체가 손상되면 그 개소를 통하여 전선로에서 대지로 누전전류가 흘러나가게 된다. 이러한 누전전류가 흘러가 사람과 접촉하면 감전사고가 발생하고, 과도하게 흐르는 경우 아크에 의해 인화성물질이 발화되어 화재의 원인이 되기도 한다. In general, when the insulation of an electric device is damaged due to aging or damage to the insulation of an electric device, an electric leakage current flows from the electric line to the ground. When this leakage current flows and comes into contact with a person, an electric shock accident occurs, and if it flows excessively, an inflammable material is ignited by an arc, which may cause a fire.

이와 같이 위험성이 있는 누설전류를 누설전류의 유효성분(저항성 누전전류; Igr)이라 하고, 전선의 피복, 전기기기의 절연물이 손상되지 않은 상태에서 전선로와 대지 간 용량성분으로 인하여 전선로에서 대지로 누설전류가 흘러나가게 되는데 이를 누설전류의 무효성분(용량성 누전전류; Igc)이라 한다.This dangerous leakage current is referred to as the effective component of the leakage current (resistive leakage current; Igr), and leakage from the line to the ground due to the capacitive component between the line and the ground without damaging the insulation of the electric device or the electric wire. The current flows, which is called the reactive component of the leakage current (capacitive leakage current; Igc).

하지만 누설전류의 무효성분(용량성 누전전류)은 유효성분은 무효성분과 위상차가 90도가 되므로 '유효전력 = 전압 ×용량성 누전전류 ×cosθ = 0'의 계산에 의해 유효전력의 크기가 제로가 되므로 용량성 누전전류로 인해 감전사고나 화재 등이 발생하지 않는다.However, since the reactive component of the leakage current (capacitive leakage current) has an active component with a phase difference of 90 degrees, the active power has zero magnitude by calculating 'active power = voltage × capacitive leakage current × cosθ = 0'. Therefore, no electric shock or fire occurs due to the capacitive leakage current.

따라서 감전사고나 화재등을 방지하기 위해서는 유효성분을 검출하는 것이 매우 중요하다.Therefore, it is very important to detect active ingredients in order to prevent electric shock or fire.

현재 누설전류를 원격 측정하기 위한 방법으로는 전력량계, 원격검침 시스템 또는 수배전반 내부 등에 영상변류기를 설치하여 누설전류에 대한 유효성분과 무효성분에 대한 벡터합으로 누설전류를 검출하고 있다. 이러한 누설전류를 측정하기 위하여 각 배전 선로마다 영상변류기(ZCT ; Zero Current Transformer)를 설치한다.Currently, as a method for remotely measuring leakage current, an image transformer is installed in an electricity meter, a remote meter reading system, or inside a water distribution panel to detect leakage current as a vector sum of active components and invalid components. In order to measure the leakage current, an image current transformer (ZCT) is installed for each distribution line.

이러한 영상변류기를 이용하여 누설전류를 측정하는 구체적 방법의 일예가 국내실용신안등록 제0448842호(이하, ‘선행기술문헌 1’이라 함)에 개시되어 있다.An example of a specific method for measuring leakage current using such an image transformer is disclosed in Korean Utility Model Registration No. 0448842 (hereinafter referred to as "Prior Art Document 1").

도 1은 종래의 영상전류 검출방식을 나타낸 개념도이다.1 is a conceptual diagram showing a conventional video current detection method.

도 1에 도시된 바와 같이 접지계통(12)이 연결된 변압기(10)의 각 2차 선로(11)에는 영상전류를 검출하는 영상변류기(20)가 각각 설치되고, 이 영상변류기(20)는 누전경보기(30)와 연결되어 검출되는 영상전류 값이 기준값 이상인 경우 누전경보기(30)를 구동시키고 있다.As shown in FIG. 1, an image transformer 20 for detecting an image current is respectively installed on each secondary line 11 of the transformer 10 to which the ground system 12 is connected, and the image transformer 20 is short-circuited. When the detected image current value connected to the alarm 30 is greater than or equal to a reference value, the short circuit alarm 30 is driven.

하지만 비접지 계통의 경우 누설사고시에도 사용설비에 전원공급이 가능하다는 장점이 있지만 누설전류의 크기가 매우 작아서 누설전류를 검출하기가 어려운 문제점이 있다.However, in the case of a non-grounded system, there is an advantage in that power can be supplied to the equipment used even in the event of a leak, but the size of the leakage current is very small, which makes it difficult to detect the leakage current.

1. 국내실용신안등록 제0448842호(2010. 01. 22 등록)1. Domestic utility model registration No. 0448842 (2010. 01. 22 registration)

따라서 본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로, 저압 비접지 계통과 같이 누설전류의 크기가 매우 작은 비접지 계통에서도 누설전류를 검출할 수 있도록 된 비접지 계통의 분전반 누설전류 검출방법 및 시스템을 제공하는 데 목적이 있다.Therefore, the present invention has been devised to solve the above problems, and a method for detecting the leakage current of a distribution board of a non-grounded system capable of detecting leakage current even in a non-grounded system having a very small leakage current, such as a low-voltage non-grounded system. And to provide a system.

본 발명은 일측면에 의하면 비접지 계통의 분전반 누설전류 검출방법에 있어서, 상기 비접지 계통의 분전반은 각 분기부로 분기되고, 분기된 상기 각 분기부에 영상변류기가 설치되며, 상기 각 분기부에 설치된 영상변류기의 영상전류를 측정하는 계측기가 설치되고, 상기 각 분기부에 설치된 계측기에서 측정된 영상전류의 방향이 다른 분기부가 발생할 경우 상기 방향이 다른 분기부를 누설이 발생한 분기부로 판단하는 비접지 계통의 분전반 누설전류 검출방법을 제공한다.According to an aspect of the present invention, in a method for detecting leakage current of a distribution board of a non-grounding system, the distribution board of the non-grounding system is branched to each branch, and an image transformer is installed in each branched branch, and each branch is A non-grounding system that determines a branch that has a different direction when a branch that has a different direction of the image current measured by the instrument installed in each branch is installed. Provides a method for detecting leakage current in the distribution panel.

또한 본 발명은 다른 측면에 의하면 인입부와; 상기 인입부로부터 분기되어 부하로 전기를 인가하되 상기 인입부와 함께 비접지 계통을 구성하는 다수의 분기부와; 상기 각 분기부에 설치된 영상변류기와; 상기 각 분기부에 설치된 영상변류기의 영상전류를 측정하는 계측기와; 상기 각 계측기로부터 측정된 영상전류를 전송받아 계측기가 설치된 각 분기부 중 영상전류의 방향이 다른 분기부를 누설이 발생한 분기부로 판단하는 누설전류 검출부;를 포함하는 비접지 계통의 분전반 누설전류 검출 시스템을 제공한다.In addition, according to another aspect of the present invention, a lead-in portion; A plurality of branch portions that branch from the inlet portion and apply electricity to a load, but form a non-ground system together with the inlet portion; An image transformer installed in each branch part; An instrument for measuring the image current of the image transformer installed in each branch; A leakage current detection system for a non-grounded distribution panel comprising: a leakage current detection unit that receives a measured image current from each measuring instrument and determines a branch having a different direction of image current among the branch portions where the measuring instrument is installed as a leaked branch. to provide.

상기와 같이 본 발명에 따른 비접지 계통의 분전반 누설전류 검출방법 및 시스템은 계측에서 측정된 영상전류의 방향만으로 누설이 발생한 분기부를 찾을 수 있으므로 영상전압의 감지를 위한 접지형 계기용 변압기(Ground Potential Transformer; 이하, ‘GPT’라 함)가 필요 없다.As described above, the method and system for detecting the leakage current of the distribution panel of the non-grounding system according to the present invention can find the branch where the leakage occurred only in the direction of the measured image current in the measurement, so the ground type transformer for sensing the image voltage (Ground Potential) Transformer (hereinafter referred to as 'GPT') is not required.

아울러 본 발명에 따른 비접지 계통의 분전반 누설전류 검출방법 및 시스템은 GPT가 필요 없으므로 분전반의 내부공간을 효율적으로 활용할 수 있다.In addition, the method and system for detecting the leakage current of the distribution panel of the non-grounded system according to the present invention do not require GPT, so that the internal space of the distribution panel can be effectively utilized.

또한 본 발명에 따른 비접지 계통의 분전반 누설전류 검출방법 및 시스템은 GPT가 필요 없으므로 종래의 누설전류 측정시 사용되는 고압계통 보호 장비가 필요 없다.In addition, the method and system for detecting the leakage current of the distribution panel of the non-grounded system according to the present invention do not need GPT, and therefore, there is no need for a high-voltage system protection device used for measuring leakage current.

도 1은 종래의 영상전류 검출방식을 나타낸 개념도이다.
도 2는 본 발명의 일실시예에 따른 비접지 계통의 분전반 누설전류 검출시스템을 나타내는 계통도이다.1 is a conceptual diagram showing a conventional video current detection method.
2 is a system diagram showing a leakage current detection system of a distribution panel of a non-grounded system according to an embodiment of the present invention.

이하 본 발명에 따른 비접지 계통의 분전반 누설전류 검출방법 및 시스템의 일실시예를 첨부도면을 참조하여 설명하면 다음과 같다.Hereinafter, an exemplary embodiment of a method and system for detecting leakage current in a distribution panel of a non-grounded system according to the present invention will be described with reference to the accompanying drawings.

도 2는 본 발명의 일실시예에 따른 비접지 계통의 분전반 누설전류 검출시스템을 나타내는 계통도이다.2 is a system diagram showing a leakage current detection system of a distribution panel of a non-grounding system according to an embodiment of the present invention.

도 2에 도시된 바와 같이 본 발명의 일실시예에 따른 비접지 계통의 분전반 누설전류 검출시스템은 인입부(110)와, 상기 인입부(110)로부터 분기되어 부하로 전기를 인가하되 상기 인입부(110)와 함께 비접지 계통을 구성하는 다수의 분기부(120a, 120b, 120c)와, 상기 각 분기부(120a, 120b, 120c)에 설치된 영상변류기(130a, 130b, 130c)와, 상기 각 분기부(120a, 120b, 120c)에 설치된 영상변류기의 영상전류를 측정하는 계측기(140a, 140b, 140c)와, 상기 각 계측기(140a, 140b, 140c)로부터 측정된 영상전류를 전송받아 계측기(140a, 140b, 140c)가 설치된 각 분기부(120a, 120b, 120c) 중 영상전류의 방향이 다른 분기부(120a)를 누설이 발생한 분기부(120a)로 판단하는 누설전류 검출부(150)를 포함한다.As shown in FIG. 2, the leakage current detection system of the distribution panel of a non-grounded system according to an embodiment of the present invention is branched from the inlet 110 and the inlet 110 to apply electricity to a load, but the inlet A plurality of branch parts (120a, 120b, 120c) constituting the non-grounding system together with (110), and the image transformers (130a, 130b, 130c) installed in each branch part (120a, 120b, 120c), and each Measuring instruments (140a, 140b, 140c) for measuring the image current of the image transformer installed in the branch (120a, 120b, 120c), and each measuring instrument (140a, 140b, 140c) receives the measured current from the measuring instrument (140a) , 140b, 140c), each of the branch portions 120a, 120b, and 120c having a leak current detection unit 150 for determining a branch portion 120a having a different direction of image current as a branch portion 120a in which leakage occurs. .

상기 인입부(110)는 전류를 인가하는 구성요소로서 3상의 전기가 옥내로 인가된다. 상기 인입부(110)의 경우 고압 비접지 계통에서는 선택지락을 위하여 GPT를 설치하지만 본 발명에서는 영상전압이 아니라 영상전류를 이용하여 누설전류를 측정할 수 있으므로 크기가 큰 GPT를 설치하지 않는다. 통상적으로 인입부(110)에는 옥내와 옥외의 전원을 차단하기 위한 차단기(112)가 설치되며 소정의 전압이나 전류가 인가될 경우 차단기(112)가 작동하여 인입부(110)를 통하여 옥내로 전류가 인가되지 않도록 차단하게 된다.The inlet 110 is a component that applies a current, and three-phase electricity is applied indoors. In the case of the inlet unit 110, a GPT is installed for a selective ground in a high-voltage non-grounding system, but in the present invention, a large GPT is not installed because the leakage current can be measured using the image current instead of the image voltage. Typically, a breaker 112 is installed in the inlet 110 to cut off power from indoors and outdoors, and when a predetermined voltage or current is applied, the breaker 112 operates to enter the indoor through the inlet 110. Is blocked so that is not applied.

상기 분기부(120a, 120b, 120c)는 인입부(110)로부터 인가된 전류가 전달되는 구성요소로서 주로 배전반에 설치된다. 상기 분기부(120a, 120b, 120c)는 각 부하로 안전하게 전류가 인가되도록 하기 위하여 각 부하에서 필요로 하는 수요 전기량을 산출하여 과부하가 걸리지 않도록 설계한다. 상기 각 분기부(120a, 120b, 120c) 또한 소정의 전압이나 전류가 인가될 경우 각 부하로 공급되는 전기를 차단하기 위한 차단기(122a, 122b, 122c)가 각각 설치된다.The branch portions 120a, 120b, and 120c are components that transmit current applied from the inlet portion 110 and are mainly installed in the switchboard. The branch parts 120a, 120b, and 120c are designed to calculate the amount of demand electricity required by each load so as not to overload it so that current can be safely applied to each load. Each of the branch portions 120a, 120b, and 120c is also provided with circuit breakers 122a, 122b, and 122c for blocking electricity supplied to each load when a predetermined voltage or current is applied.

상기 영상변류기(130a, 130b, 130c)는 각 분기부(120a, 120b, 120c)에 설치된다. 통상 영상변류기(130a, 130b, 130c)는 대전류 회로에서 지락사고가 발생시 각 상이 불평형 전류를 검출하여 이에 비례한 미소전류를 2차 측으로 전하게 된다. 이렇게 2차측에 전달된 미소전류가 소정의 크기 이상이면 차단기(122a, 122b, 122c)를 작동시켜 전류의 공급을 차단하게 된다.The image transformers 130a, 130b, and 130c are installed in each branch part 120a, 120b, 120c. Normally, the image transformers 130a, 130b, and 130c detect unbalanced currents in each phase when a ground fault occurs in a large current circuit, and transmit a small current proportional to this to the secondary side. If the microcurrent transmitted to the secondary side is greater than a predetermined size, the circuit breakers 122a, 122b, and 122c are operated to cut off the supply of current.

상기 계측기(140a, 140b, 140c)는 이러한 영상전류를 측정하는 계측 장비로서 영상전류의 크기와 방향을 측정하여 상기 누설전류 검출부(150)로 전송하게 된다.The measuring devices 140a, 140b, and 140c are measurement equipment that measures the image current, and measure the magnitude and direction of the image current and transmit it to the leakage current detector 150.

상기 누설전류 검출부(150)는 상기 각 계측기(140a, 140b, 140c)로부터 측정된 영상전류를 전송받아 계측기(140a, 140b, 140c)가 설치된 각 분기부(120a, 120b, 120c) 중 영상전류의 방향이 다른 분기부(120a)를 누설이 발생한 분기부(120a)로 판단하는 구성요소이다. 즉 상기 누설전류 검출부(150)는 상기 계측기(140a, 140b, 140c))로부터 전송되는 영상전류의 크기 및 방향을 연산하여 영상전류이 방향이 다른 분기부(120a)를 누설이 발생한 분기부(120a)로 판단하는 것이다. 상기 계측기(140a, 140b, 140c)로부터 상기 누설전류 검출부(150)로의 전송은 별도의 통신선을 통하여 영상전류의 정보를 전달하는 것이 바람직하다. 상기 누설전류 검출부(150)는 인입라인 미터(152)와 운용시스템(154)으로 구성되어 인입라인 미터(152)에서 우선적으로 영상전류의 방향을 검출하여 운용시스템(154)에 전송하고 운용시스템(154)에서 상기 인입라인 미터(152)에 지령을 내려 인입부(110)의 차단기(112)가 작동되도록 한다.The leakage current detection unit 150 receives the measured image current from each of the measuring instruments 140a, 140b, 140c, and displays the image current among the branch portions 120a, 120b, 120c where the measuring instruments 140a, 140b, 140c are installed. It is a component that determines the branch part 120a having a different direction as the branch part 120a in which leakage has occurred. That is, the leakage current detection unit 150 calculates the magnitude and direction of the image current transmitted from the measuring instruments 140a, 140b, and 140c, and the branch portion 120a in which the image current has a different direction leaks the branch portion 120a. It is judged by. It is preferable to transfer the information of the image current through the separate communication line for the transmission from the measuring instruments 140a, 140b, 140c to the leakage current detector 150. The leakage current detection unit 150 is composed of an inlet line meter 152 and an operating system 154. The incoming line meter 152 preferentially detects the direction of the image current and transmits it to the operating system 154 and transmits the operating system ( At 154), a command is given to the inlet line meter 152 so that the breaker 112 of the inlet 110 is operated.

이하, 본 발명의 일실시예에 따른 비접지 계통의 분전반 누설전류 검출방법은 다음과 같다.Hereinafter, a method for detecting leakage current in a distribution panel of a non-grounded system according to an embodiment of the present invention is as follows.

먼저 도 2와 같이 구성된 비접지 계통의 분전반 누설전류 검출시스템에서 각 분기부(120a, 120b, 120c)에 설치된 계측기(140a, 140b, 140c)로부터 영상전류의 크기와 방향이 누설전류 검출부(150)로 전달된다.First, in the non-grounded distribution panel leakage current detection system configured as shown in FIG. 2, the magnitude and direction of the image current from the measuring instruments 140a, 140b, and 140c installed in each branch unit 120a, 120b, and 120c is the leakage current detection unit 150. Is delivered to.

여기서 상기 누설전류 검출부(150)는 인입라인 미터(152)와 이 인입라인 미터(152)와 통신이 가능한 운용시스템(154)으로 이루어진다. 따라서 상기 영상전류의 크기와 방향은 인입라인 미터(152)에 전달되고, 인입라인 미터(152)에 전달된 영상전류의 방향과 크기는 운용시스템(154)에 전달된다. 상기 계측기(140a, 140b, 140c)로부터 전달된 영상전류의 방향과 크기에 따라 상기 운용시스템(154)은 이를 연산하여 인입라인 미터(152)에 인입부(110) 차단기(112)의 작동을 명령할 수 있다. 본 실시예에서 기재하지는 않았지만 상기 운용시스템에는 이력을 기록하기 위한 데이터베이스가 설치될 수 있다.Here, the leakage current detection unit 150 is composed of an incoming line meter 152 and an operating system 154 capable of communicating with the incoming line meter 152. Therefore, the size and direction of the image current is transmitted to the inlet line meter 152, and the direction and size of the image current delivered to the inlet line meter 152 is transmitted to the operating system 154. According to the direction and size of the image current transmitted from the measuring instruments 140a, 140b, 140c, the operating system 154 calculates this and instructs the inlet line meter 152 to operate the inlet 110 circuit breaker 112. can do. Although not described in this embodiment, a database for recording a history may be installed in the operating system.

상기와 같은 이력을 출력하여 작업자가 필요시 누설전류가 발생한 분기부(120a)의 누설 원인을 찾아 누설의 발생을 해결할 수 있다.By outputting the history as described above, if necessary, the operator can find the cause of the leak in the branch 120a where the leak current has occurred and solve the occurrence of the leak.

110 : 인입부
112 : 인입부 차단기
120a, 120b, 120c : 분기부
122a, 122b, 122c : 분기부 차단기
130a, 130b, 130c : 영상변류기
140a, 140b, 140c : 계측기
150 : 누설전류 검출부
152 : 인입라인 미터
154 : 운용시스템110: incoming part
112: inlet breaker
120a, 120b, 120c: branch
122a, 122b, 122c: branch circuit breaker
130a, 130b, 130c: image transformer
140a, 140b, 140c: instrument
150: leakage current detection unit
152: incoming line meter
154: operating system

Claims (2)

비접지 계통의 분전반 누설전류 검출방법에 있어서,
상기 비접지 계통의 분전반은 각 분기부로 분기되고, 분기된 상기 각 분기부에 영상변류기가 설치되며, 상기 각 분기부에 설치된 영상변류기의 영상전류를 측정하는 계측기가 설치되고, 상기 각 분기부에 설치된 계측기에서 측정된 영상전류의 방향이 다른 분기부가 발생할 경우 상기 방향이 다른 분기부를 누설이 발생한 분기부로 판단하는 것을 특징으로 하는 비접지 계통의 분전반 누설전류 검출방법.
In the method of detecting the leakage current of the distribution panel of a non-grounded system,
The distribution board of the non-grounding system is branched to each branch, an image transformer is installed in each branch, and an instrument for measuring the image current of the image transformer installed in each branch is installed, and each branch is installed. A method for detecting leakage current in a distribution board of a non-grounded system, characterized in that a branch having a different direction of the image current measured by the installed measuring instrument is determined as a branch having a leak.
인입부와;
상기 인입부로부터 분기되어 부하로 전기를 인가하되 상기 인입부와 함께 비접지 계통을 구성하는 다수의 분기부와;
상기 각 분기부에 설치된 영상변류기와;
상기 각 분기부에 설치된 영상변류기의 영상전류를 측정하는 계측기와;
상기 각 계측기로부터 측정된 영상전류를 전송받아 계측기가 설치된 각 분기부 중 영상전류의 방향이 다른 분기부를 누설이 발생한 분기부로 판단하는 누설전류 검출부;를 포함하는 것을 특징으로 하는 비접지 계통의 분전반 누설전류 검출 시스템.A lead portion;
A plurality of branch portions that branch from the inlet portion and apply electricity to the load, but form a non-grounding system together with the inlet portion;
An image transformer installed in each branch part;
An instrument for measuring the image current of the image transformer installed in each branch;
And a leakage current detection unit receiving the measured image current from each measuring instrument and determining a branch having a different direction of the image current among the branch portions where the measuring instrument is installed, as a leaking branch. Current detection system.
KR1020190132061A 2019-10-23 2019-10-23 Method for measuring ground leakage current in an isolated neutral system and the system for same KR102108138B1 (en)

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Publication number Priority date Publication date Assignee Title
KR102390202B1 (en) * 2021-04-16 2022-04-26 전명수 3-phase 3-wire power system ground fault protection device and method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11278539A (en) * 1998-03-26 1999-10-12 Dainippon Printing Co Ltd Sample package and book with sample
JPH11287836A (en) * 1998-04-02 1999-10-19 Ntt Power And Building Facilities Inc Compound measuring device of power supply circuit
KR20070013675A (en) * 2005-07-27 2007-01-31 박기주 Digital cabinet panel
KR200448842Y1 (en) 2008-07-10 2010-05-26 박형민 Device for monitoring a zero-phasecurrent of transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11278539A (en) * 1998-03-26 1999-10-12 Dainippon Printing Co Ltd Sample package and book with sample
JPH11287836A (en) * 1998-04-02 1999-10-19 Ntt Power And Building Facilities Inc Compound measuring device of power supply circuit
KR20070013675A (en) * 2005-07-27 2007-01-31 박기주 Digital cabinet panel
KR200448842Y1 (en) 2008-07-10 2010-05-26 박형민 Device for monitoring a zero-phasecurrent of transformer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102390202B1 (en) * 2021-04-16 2022-04-26 전명수 3-phase 3-wire power system ground fault protection device and method thereof

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