KR20020090146A - Method and device for detecting ground fault - Google Patents

Method and device for detecting ground fault Download PDF

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Publication number
KR20020090146A
KR20020090146A KR1020020028393A KR20020028393A KR20020090146A KR 20020090146 A KR20020090146 A KR 20020090146A KR 1020020028393 A KR1020020028393 A KR 1020020028393A KR 20020028393 A KR20020028393 A KR 20020028393A KR 20020090146 A KR20020090146 A KR 20020090146A
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South Korea
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ground
ground fault
phase
circuit
current
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KR1020020028393A
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Korean (ko)
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가와무라나오키
가노이미노루
후지타야스노부
시바타요조
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가부시끼가이샤 히다치 세이사꾸쇼
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Publication of KR20020090146A publication Critical patent/KR20020090146A/en

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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders

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

Abstract

PURPOSE: To provide a compact ground fault detecting apparatus by detecting zero-phase current and overcurrent flowing through a distribution line using a current transformer. CONSTITUTION: In the invention, when a ground voltage is detected through a limiting resistor 17A and a ground overvoltage relay 12 in the tertiary open delta circuit 10C of a transformer 10 for grounded instruments, the switching circuit 18 is closed to form a low impedance circuit 17 so that the ground fault current i1 flowing in the distribution line is detected by a transformer 5, thereby omitting a zero-phase transformer.

Description

지락검출방법 및 그 장치{METHOD AND DEVICE FOR DETECTING GROUND FAULT}Ground detection method and device therefor {METHOD AND DEVICE FOR DETECTING GROUND FAULT}

본 발명은 지락검출방법 및 그 장치에 관한 것으로, 특히 수변전설비에 있어서의 지락사고에 의하여 발생하는 지락전류를 검출하는 데 적합한 지락검출방법 및 그 장치에 관한 것이다.The present invention relates to a ground fault detection method and apparatus, and more particularly, to a ground fault detection method and apparatus suitable for detecting a ground fault current caused by a ground fault in a water substation facility.

도 2는 종래의 비접지계통에 있어서의 지락검출장치의 회로를 나타내는 구성도이다. 도면에 있어서, 1은 3상 비접지계통의 모선이고, 2는 이 3상 모선(1)에 접속된 지락검출대상이 되는 배전선이다. 3은 배전선(2)의 도중에 설치되어 3상 모선(1)과 배전선(2)을 분리하는 차단기, 4는 배전선(2)에 흐르는 지락전류를 검출하는 영상 변류기, 5는 배전선(2)에 흐르는 전류를 2차 출력하는 3상분의 변류기이다. 10은 3상 비접지계통의 3상 모선(1)에 접속된 접지형 계기용 변압기이고, 이 접지형 계기용 변압기(10)는 1차 회로(10a), 2차 회로(10b), 3차 오픈델타회로 (10c)의 구성으로 되어 있다. 11은 3차 오픈델타회로(10c)와 병렬로 접속된 저항, 12는 저항(11)과 병렬접속되어 지락전압을 검출하는 지락과전압 계전기, 13은 변류기(5)로부터의 과전류를 검출하는 과전류 계전기, 14는 3상분의 변류기(5)의 2차 회로, 15는 3상분의 변류기의 2차 잔류회로, 16은 지락전압과 지락전류가 입력되는 지락검출 계전기이다.2 is a configuration diagram showing a circuit of a ground fault detection apparatus in a conventional non-grounding system. In the figure, 1 is a bus bar of a three-phase non-grounding system, and 2 is a distribution wire to be a ground fault detection object connected to the three-phase bus bar 1. 3 is a breaker which is installed in the middle of the distribution line 2 to separate the three-phase busbar 1 and the distribution line 2, 4 is an image current transformer which detects a ground current flowing through the distribution line 2, and 5 is flowed through the distribution line 2 It is a three-phase current transformer that outputs secondary current. 10 is a ground-type instrument transformer connected to a three-phase bus bar (1) of a three-phase ungrounded system, and the ground-type instrument transformer (10) includes a primary circuit (10a), a secondary circuit (10b), and a tertiary The open delta circuit 10c is constituted. 11 is a resistor connected in parallel with the tertiary open delta circuit 10c, 12 is a ground fault overvoltage relay connected in parallel with the resistor 11 to detect a ground fault voltage, and 13 is an overcurrent relay for detecting overcurrent from the current transformer 5 14 denotes a secondary circuit of the three-phase current transformer 5, 15 denotes a secondary residual circuit of the three-phase current transformer, and 16 denotes a ground detection relay to which a ground voltage and a ground current are input.

다음에 상기한 지락검출장치에 있어서의 동작에 대하여 설명한다. 지락사고점(6)에서 지락이 발생하면, 3상 모선(1)에는 지락전압이 발생한다. 이 지락전압은 접지형 계기용 변압기(10)의 3차 오픈델타회로(10c)를 거쳐 지락과전압 계전기(12)로 검출된다. 한편, 전로에는 접지형 계기용 변압기(10)의 3차 오픈델타회로(10c)가 접속되고, 이 3차 오픈델타회로(10c)와 병렬로 접속되어 있는저항(11)으로 제한된 지락전류(i1)는 영상 변류기(4)의 2차 출력에 의하여 검출된다.Next, the operation in the ground fault detection apparatus described above will be described. When a ground fault occurs at the ground fault point 6, a ground fault voltage is generated in the three-phase busbar 1. The ground voltage is detected by the ground overvoltage relay 12 via the third open delta circuit 10c of the ground-type instrument transformer 10. On the other hand, a ground fault current i1 limited to a resistor 11 connected in parallel with the third open delta circuit 10c of the ground-type instrument transformer 10 is connected to the converter. Is detected by the secondary output of the image current transformer 4.

이상과 같이 검출된 접지형 계기용 변압기(10)에 의한 지락전압과 영상변류기 (4)에 의한 지락전류는 지락검출 계전기(16)에 입력되고, 이 지락검출 계전기(16)로 지락고장을 판정하여 차단기 (3)에 차단지령을 가함으로써 차단기(3)를 개방하여 지락대상의 배전선(2)을 분리하는 것이다.The ground fault voltage by the ground-type instrument transformer 10 detected as described above and the ground fault current by the image current transformer 4 are inputted to the ground fault detection relay 16, and the ground fault detection relay 16 determines the ground fault. By applying a blocking command to the circuit breaker 3, the circuit breaker 3 is opened to separate the distribution line 2 of the ground fault.

한편, 배전선(2)에는 단락고장에 대비한 과전류 계전기(13)가 구비되어 있고, 이것은 상기한 영상 변류기(4)와는 별도로 3상의 변류기(5)의 2차 회로(14)에 접속되어 있다. 또 접지형 계기용 변압기(10)의 3차 오픈델타회로(10c)에는, 전로지락시에 발생하는 지락전압을 검출하는 지락 과전압 계전기(12)가 접속되어 있다.On the other hand, the distribution line 2 is provided with an overcurrent relay 13 in preparation for a short circuit failure, which is connected to the secondary circuit 14 of the three-phase current transformer 5 separately from the image current transformer 4 described above. A ground fault overvoltage relay 12 for detecting the ground fault voltage generated at the time of the ground fault is connected to the third open delta circuit 10c of the ground-type instrument transformer 10.

이상과 같이 종래의 지락검출장치에서는, 비접지계통의 지락검출 계전기(16)가 접지형 계기용 변압기(10)의 3차 오픈델타회로(10c)의 출력과 배전선 (2)의 영상 변류기(4)의 2차 출력을 사용하여 검출하고 있고, 또한 배전선(2)에는 이 외에 과전류 계전기(13)에 대응한 3상의 변류기(5)가 구비되어 있다. 이 때문에 배전선(2)에는 3상의 변류기(5)와 영상 변류기(4)의 2종류를 구비할 필요가 있어 지락검출장치가 대형화하는 것은 물론, 나아가서는 이것을 수납하는 배전반이 대형화하는 것을 피할 수 없었다.As described above, in the conventional ground fault detection device, the ground fault detection relay 16 of the non-grounded system outputs the third open delta circuit 10c of the ground-type instrument transformer 10 and the video current transformer 4 of the distribution line 2. Is detected using a secondary output, and the distribution line 2 is provided with a three-phase current transformer 5 corresponding to the overcurrent relay 13 in addition. For this reason, it is necessary to equip the distribution line 2 with two types of three-phase current transformers 5 and the video current transformers 4, so that the ground fault detection apparatus is not only enlarged, but also it is inevitable to increase the size of the switchboard which accommodates them. .

또 지락시의 지락전류를 변류기(5)의 2차 잔류회로(15)로 검출하기 위해서는 지락시의 접지형 계기용 변압기(10)의 3차 오픈델타회로(10c)에 접속되어 있는 저항(11)으로 제한된 지락전류밖에 흐르지 않기 때문에 단락시의 과전류에 대비하여변류비를 크게 하고 있기 때문에, 변류기(5)의 2차 잔류회로(15)에 흐르는 지락전류는 전류치가 작아 검출이 어려운 문제가 있었다.In addition, in order to detect the ground fault current at the time of ground fault with the secondary residual circuit 15 of the current transformer 5, the resistor 11 connected to the tertiary open delta circuit 10c of the ground-type instrument transformer 10 at the time of ground fault. Since only the ground fault current flows limited to), the current ratio is increased in preparation for the overcurrent at the time of short-circuit. Therefore, the ground fault current flowing through the secondary residual circuit 15 of the current transformer 5 has a small current value, making it difficult to detect. .

본 발명의 목적은 장치의 소형화가 도모되는 것은 물론, 지락시의 검출을 간단하게 행할 수 있는 지락검출방법 및 그 장치를 제공하는 것에 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a ground fault detection method and a device that can reduce the size of the device and can easily perform a ground fault detection.

도 1은 본 발명의 실시예로서 나타낸 지락검출장치의 회로도,1 is a circuit diagram of a ground fault detection device shown as an embodiment of the present invention;

도 2는 종래의 지락검출장치의 회로도이다.2 is a circuit diagram of a conventional ground fault detection apparatus.

※도면의 주요부분에 대한 부호의 설명※ Explanation of symbols for main parts of drawing

1 : 3상 모선2 : 배전선1: 3-phase bus 2: Distribution line

3 : 차단기4 : 영상 변류기3: circuit breaker 4: video current transformer

5 : 변류기6 : 지락사고점5: current transformer 6: ground fault

10 : 접지형 계기용 변압기10a : 1차 회로10: grounding instrument transformer 10a: primary circuit

10b : 2차 회로10c : 3차 오픈델타회로10b: 2nd circuit 10c: 3rd open delta circuit

11 : 저항12 : 지락 과전압 계전기11: resistance 12: ground overvoltage relay

13 : 과전류 계전기14 : 변류기의 2차 회로13: overcurrent relay 14: secondary circuit of current transformer

15 : 변류기(3상)의 2차 잔류회로16 : 지락검출 계전기15: Second residual circuit of current transformer (3 phase) 16: Ground fault detection relay

17 : 저임피던스회로17A : 제한저항17: low impedance circuit 17A: limiting resistance

18 : 전환회로18: switching circuit

상기 목적을 달성하기 위하여 본 발명에서는 접지형 계기용 변압기의 3차 오픈델타회로에 접속된 제한저항 및 지락과전압 계전기에 의하여 지락전압을 검출함으로써, 전환회로를 폐쇄하여 저임피던스회로를 형성하고, 이에 의하여 배전선에 흐르는 지락전류의 전류치를 크게 하고, 이것을 변류기로 검출하도록 하여 종래의 영상 변류기를 생락한 것을 특징으로 한다.In order to achieve the above object, the present invention detects the ground voltage by the limiting resistor and the ground overvoltage relay connected to the third open delta circuit of the ground-type instrument transformer, thereby closing the switching circuit to form a low impedance circuit. The current value of the ground fault current flowing in the distribution line is increased, and this is detected by the current transformer, thereby eliminating the conventional video current transformer.

본 발명의 실시형태를 도 1에 나타내는 지락검출장치에 의하여 설명한다.Embodiment of this invention is demonstrated by the ground fault detection apparatus shown in FIG.

도면에 있어서, 1은 3상 비접지계통의 3상 모선이고, 2는 이 3상 모선(1)에 접속된 지락검출대상이 되는 배전선이다. 3은 배전선(2)의 도중에 설치되어 3상 모선(1)과 배전선(2)을 분리하는 차단기, 5는 배전선(2)에 흐르는 전류를 2차 출력하는 3상분의 변류기이다. 10은 3상 모선(1)에 접속된 접지형 계기용 변압기이고, 이 접지형 계기용 변압기(10)는, 1차 회로(10a), 2차 회로(10b), 3차 회로(10c)의 구성으로 되어 있다. 11은 3차 오픈델타회로(10c)와 병렬로 접속된 저항(11), 17A는 저항(11)과 병렬접속된 제한저항, 18은 제한저항(17A)과 직렬 접속되어 지락전압을 검출하는 지락 과전압 계전기(12)의 동작에 의하여 폐쇄되는 전환회로이다.전환회로 (18)가 폐쇄되면 제한저항(17A)으로 저임피던스회로(17)를 형성한다. 15는 3상분의 변류기(5)의 2차 잔류회로, 16은 지락전압과 지락전류가 입력되는 지락검출 계전기이다. 지락검출 계전기(16)는 지락전류(i1)가 방향성, 즉 접지(E1)방향으로 흐르는지의 여부를 보고 있기 때문에, 일종의 방향성 계전기라 할 수 있다.In the drawing, 1 is a three-phase bus bar of a three-phase non-grounding system, and 2 is a distribution line to be the ground fault detection object connected to the three-phase bus bar 1. 3 is a breaker provided in the middle of the distribution line 2, and isolate | separates the three-phase bus 1 and the distribution line 2, and 5 is a three-phase current transformer which outputs the electric current which flows through the distribution line 2 secondary. 10 is a grounding-type instrument transformer connected to the three-phase busbar 1, and the grounding-type instrument transformer 10 includes the primary circuit 10a, the secondary circuit 10b, and the tertiary circuit 10c. It is composed. 11 is a resistor 11 connected in parallel with the third open delta circuit 10c, 17A is a limiting resistor connected in parallel with the resistor 11, and 18 is a ground fault connected in series with the limiting resistor 17A to detect a ground fault voltage. The switching circuit is closed by the operation of the overvoltage relay 12. When the switching circuit 18 is closed, the low impedance circuit 17 is formed by the limiting resistor 17A. 15 is a secondary residual circuit of the three-phase current transformer 5, and 16 is a ground detection relay to which a ground voltage and a ground current are input. Since the ground detection relay 16 sees whether or not the ground current i1 flows in the directional direction, that is, the ground E1 direction, the ground detection relay 16 is a kind of directional relay.

다음에 본 실시예에 있어서의 지락검출장치의 동작에 대하여 설명한다. 지락사고점(6)에서 지락이 발생하면, 배전선(3)에 생긴 지락사고점(6)의 지락전류(i1)가, 접지(E1)로부터 접지형 계기용 변압기(10)의 접지(E)와 3상 모선(1) 및 3상 배전선(2)을 거쳐 접지(E1)에 순환하여 흐른다.Next, the operation of the ground fault detecting apparatus according to the present embodiment will be described. When a ground fault occurs at the ground fault point 6, the ground current i1 of the ground fault point 6 generated in the distribution line 3 is grounded from the ground E1 to the ground E of the transformer for a ground type instrument 10. And circulates to the ground E1 via the three-phase busbar 1 and the three-phase distribution line 2.

이 때, 3상 모선(1)에는 지락전압이 발생한다. 이 지락전압은 접지형 계기용 변압기(10)의 3차 오픈델타회로(10c)에 접속된 지락과전압 계전기(12)에 의하여 검출된다. 지락전압을 검출함으로써 지락과전압 계전기(12)가 동작하면, 저항(11)과 병렬로 접속된 제한저항(17A) 및 전환회로(18)가 동작한다.At this time, a ground fault voltage is generated in the three-phase busbar 1. This ground voltage is detected by the ground overvoltage relay 12 connected to the tertiary open delta circuit 10c of the ground-type instrument transformer 10. When the ground overvoltage relay 12 operates by detecting the ground voltage, the limiting resistor 17A and the switching circuit 18 connected in parallel with the resistor 11 operate.

지락과전압 계전기(12a)동작에 의하여 전환회로(18)가 동작, 즉 폐쇄되면 저임피던스회로(17)를 형성하기 때문에 전환회로(18)의 동작전보다도 지락전류(i1)는 손실이 적어져 증가하게 된다. 증가한 지락전류(i1)는 변류기(5)의 2차 잔류회로 (15)에 의하여 검출된다.Since the low-impedance circuit 17 is formed when the switching circuit 18 is operated, i.e., closed by the ground overvoltage relay 12a, the ground current i1 decreases more than before the switching circuit 18 operates. do. The increased ground current i1 is detected by the secondary residual circuit 15 of the current transformer 5.

이 결과, 지락과전압계전기(12)의 지락전압과 3상 변류기(5)의 2차 잔류회로 (15)에 의한 지락전류(i1)를 지락검출 계전기(16)에 입력하고, 이 지락검출 계전기(16)로 지락고장을 판정하여 차단기(3)에 차단지령을 가함으로써 개방하여 지락대상의 배전선(2)을 분리할 수 있다.As a result, the ground fault voltage of the ground fault overvoltage relay 12 and the ground current i1 by the secondary residual circuit 15 of the three-phase current transformer 5 are input to the ground fault detection relay 16, and the ground fault detection relay ( 16), the ground fault can be determined, and the breaker 3 can be opened by issuing a blocking command to disconnect the distribution line 2 of the ground fault.

이와 같이 본 실시예에 의하면, 변류기(5)에 의하여 지락전류(i1)를 검출할 수 있으므로, 종래의 영상 변류기를 생략할 수 있게 되어 지락검출장치 및 지락검출장치를 사용한 배전반을 소형화할 수 있다. 또 종래의 영상 변류기는 고리형상 철심내에 3상의 배전선을 삽입하고 있었기 때문에 이 삽입작업은 용이하지 않았으나, 영상 변류기를 생략할 수 있기 때문에 배전반의 조립작업이 용이해져 조립작업의 효율이 대폭으로 향상하였다.As described above, according to the present embodiment, since the ground current i1 can be detected by the current transformer 5, the conventional video current transformer can be omitted, and the switchgear using the ground fault detection device and the ground fault detection device can be miniaturized. . In addition, the conventional video current transformer was not easy because the three-phase distribution line was inserted into the annular iron core. However, since the video current transformer could be omitted, the assembly work of the switchboard was made easier and the assembly efficiency was greatly improved. .

이상과 같이 본 발명에 의하면, 영상 변류기를 생략한 만큼, 지락검출장치 및 지락검출장치를 사용한 배전반을 소형화할 수 있다.As described above, according to the present invention, a switchgear using a ground fault detection device and a ground fault detection device can be miniaturized as long as the video current transformer is omitted.

Claims (6)

3상 모선에 3차 오픈델타회로를 가지는 접지형 계기용 변압기 및 3상 배전선이 접속되고,Grounded instrument transformer and three-phase distribution line having a third open delta circuit connected to the three-phase bus, 상기 3상 배전선에는 이 3상 배전선을 상기 3상 모선과 분리하는 차단기 및 배전선에 흐르는 전류를 2차 출력하는 3상분의 변류기를 구비하고 있고,The three-phase distribution line is provided with a circuit breaker for separating the three-phase distribution line from the three-phase bus line and a three-phase current transformer for outputting secondary current through the distribution line. 상기 3상 배전선에 생긴 지락사고점으로부터의 지락전류에 의하여 상기 3상 모선에 생긴 지락전압을 상기 3차 오픈델타회로에 접속된 지락과전압 계전기에 의하여 검출하고, 상기 지락과전압 계전기가 동작함으로서, 상기 3차 오픈델타회로에 접속되어 있는 저임피던스회로를 동작시켜 상기 저임피던스회로가 동작함으로써 증가하는 지락전류를 상기 변류기로 검출함과 동시에, 상기 지락과전압 계전기로 검출한 지락전압과 상기 변류기로 검출한 지락전류를 지락검출 계전기에 입력함으로써, 상기 지락검출 계전기로 지락고장을 판정하고, 상기 지락검출 계전기로부터의 지령에 의거하여 상기 차단기를 개방하여 지락대상의 상기 배전선을 3상 모선으로부터 분리하는 것을 특징으로 하는 지락검출방법.The ground fault voltage generated in the three-phase bus is detected by a ground fault voltage connected to the third open delta circuit by a ground fault current from the ground fault occurring in the three-phase distribution line, and the ground overvoltage relay is operated. By operating the low impedance circuit connected to the tertiary open delta circuit and operating the low impedance circuit, the ground fault current increased by the current transformer is detected, and the ground current detected by the ground overvoltage relay and the ground current detected by the current transformer. Is inputted to the ground fault detection relay, the ground fault is determined by the ground fault detection relay, and the circuit breaker is opened based on the instruction from the ground fault detection relay to separate the distribution line of the ground fault object from the three-phase bus line. Ground detection method. 3상 모선에 3차 오픈델타회로를 가지는 접지형 계기용 변압기 및 3상 배전선이 접속되고, 상기 3상 배전선에는 상기 3상 배전선을 상기 3상 모선과 분리하는 차단기 및 배전선에 흐르는 전류를 2차 출력하는 3상분의 변류기를 구비하고 있고,A grounding type instrument transformer having a third open delta circuit and a three-phase distribution line are connected to the three-phase bus line, and the three-phase distribution line is connected to the circuit breaker separating the three-phase distribution line from the three-phase bus line and the current flowing through the distribution line. It is equipped with the three-phase current transformer to output, 상기 3상 배전선에 생긴 지락사고점으로부터의 지락전류에 의하여 상기 3상모선에 생긴 지락전압을 상기 3차 오픈델타회로에 접속된 지락과전압 계전기에 의하여 검출하고, 상기 지락과전압 계전기가 동작함으로써 상기 3차 오픈델타회로에 접속되어 있는 제한저항과 전환회로를 동작시키고, 상기 전환회로가 동작함으로써 증가하는 지락전류를 상기 변류기로 검출함과 동시에, 상기 지락과전압 계전기로 검출한 지락전압과 상기 변류기로 검출한 지락전류를 지락검출 계전기에 입력함으로써 상기 지락검출 계전기로 지락고장을 판정하고, 상기 지락검출 계전기로부터의 지령에 의거하여 상기 차단기를 개방하여 지락대상의 상기 배전선을 3상 모선으로부터 분리하는 것을 특징으로 하는 지락검출방법.The ground fault voltage generated in the three-phase bus by the ground fault current from the ground fault occurring in the three-phase distribution line is detected by the ground overvoltage relay connected to the third open delta circuit, and the ground overvoltage relay is operated. By operating the limiting resistor and the switching circuit connected to the car open delta circuit, the ground fault current increased by the switching circuit is detected by the current transformer, and the ground fault voltage detected by the ground overvoltage relay and the current transformer are detected. A ground fault is determined by inputting a ground fault current to the ground fault detection relay, and the circuit breaker is opened based on an instruction from the ground fault detection relay to separate the distribution line of the ground fault object from the three-phase bus. Ground detection method. 3상 모선에 3차 오픈델타회로를 가지는 접지형 계기용 변압기 및 3상 배전선이 접속되고, 상기 3상 배전선에는 상기 3상 배전선을 상기 3상 모선과 분리하는 차단기 및 배전선에 흐르는 전류를 2차 출력하는 3상분의 변류기를 구비하고 있고, 상기 3상 배전선에 생긴 지락사고점으로부터의 지락전류가 상기 접지형 계기용 변압기와 상기 3상 모선 및 3상 배전선을 거쳐 순환하고, 이 때의 지락전류와 상기 3차 오픈델타회로의 지락과전압 계전기에 의하여 검출한 지락전압을 지락검출 계전기에 입력하고, 상기 지락검출 계전기로부터의 지령에 의하여 상기 차단기를 개방하여 지락대상의 상기 배전선을 3상 모선으로부터 분리하는 지락검출방법에 있어서,A grounding type instrument transformer having a third open delta circuit and a three-phase distribution line are connected to the three-phase bus line, and the three-phase distribution line is connected to the circuit breaker separating the three-phase distribution line from the three-phase bus line and the current flowing through the distribution line. A three-phase current transformer is provided, and the ground current from the ground fault point generated in the three-phase distribution line circulates through the ground-type instrument transformer, the three-phase bus line and the three-phase distribution line, and the ground current at this time. And inputs the ground voltage detected by the ground overvoltage relay of the third open delta circuit to the ground fault detection relay, opens the circuit breaker by a command from the ground fault detection relay, and separates the distribution line of the ground fault from the three phase bus. In the ground detection method, 상기 3차 오픈델타회로에 접속된 제한저항과 상기 지락과전압 계전기에 의하여 지락전압을 검출하면 폐쇄되는 전환회로로서 저임피던스회로를 형성하고, 이에의하여 증가하는 지락전류를 상기 변류기로 검출하여 상기 지락검출 계전기에 입력하는 것을 특징으로 하는 지락검출방법.A low impedance circuit is formed as a switching circuit which is closed when the ground resistance is detected by the limiting resistor connected to the tertiary open delta circuit and the ground overvoltage relay, thereby detecting an increased ground current by the current transformer to detect the ground fault relay. Ground detection method characterized in that input to. 3상 모선에 접속된 3차 오픈델타회로를 가지는 접지형 계기용 변압기 및 3상 배전선과, 상기 3상 배전선의 도중에 설치되어, 상기 3상 배전선을 상기 3상 모선과 분리하는 차단기와, 상기 3상 모선에 생긴 지락사고점, 접지형 계기용 변압기, 3상 모선 및 3상 배전선의 사이를 순환하는 지락전류를 검출하는 변류기와, 상기 3차 오픈델타회로에 접속되어 상기 3차 오픈델타회로의 지락전압을 검출하는 지락과전압 검출회로와, 상기 지락과전압 검출회로가 동작함으로써, 지락전류를 증가시키는 상기 3차 오픈델타회로에 접속된 저임피던스회로와, 상기 지락과전압 검출회로로 검출된 지락전압과 상기 변류기로 검출된 상기 저임피던스회로에서 증가된 지락전류가 입력되어 지락고장을 판정하여, 상기 차단기에 차단지령을 출력하는 지락검출 계전기를 구비하고 있는 것을 특징으로 하는 지락검출장치.A grounding-type instrument transformer having a third open delta circuit connected to a three-phase bus and a three-phase power distribution line, a breaker provided in the middle of the three-phase power distribution line to separate the three-phase power distribution line from the three-phase power bus; A current transformer that detects a ground fault occurring in a phase bus, a ground-type instrument transformer, a ground current that circulates between a three-phase bus and a three-phase distribution line, and a third open delta circuit connected to the third open delta circuit. A ground fault voltage detection circuit for detecting a ground fault voltage, a low impedance circuit connected to the third open delta circuit for increasing a ground fault current by operating the ground fault voltage detection circuit, a ground fault voltage detected by the ground fault voltage detection circuit and the An earth fault current is inputted from the low impedance circuit detected by the current transformer to determine an earth fault, and an earth fault detection relay outputs a break command to the breaker. And ground fault detection device, characterized in that. 제 4항에 있어서,The method of claim 4, wherein 상기 저임피던스회로는 제한저항과, 상기 제한저항과 직렬 접속되어 상기 지락과전압 계전기로부터의 입력신호에 의하여 폐쇄되는 전환회로로 이루어지는 것을 특징으로 하는 지락검출장치.And the low impedance circuit comprises a limiting resistor and a switching circuit connected in series with the limiting resistor and closed by an input signal from the ground overvoltage relay. 제 4항 또는 제 5항에 있어서,The method according to claim 4 or 5, 상기 변류기의 3상분으로 2차 잔류회로를 형성하고, 상기 3상 변류기의 2차 잔류회로에 의한 지락전류를 상기 지락검출 계전기에 입력하는 것을 특징으로 하는 지락검출장치.And a secondary residual circuit formed of three phases of the current transformer, and inputting a ground current by the secondary residual circuit of the three-phase current transformer to the ground detection relay.
KR1020020028393A 2001-05-23 2002-05-22 Method and device for detecting ground fault KR20020090146A (en)

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