METHOD OF DETECTING LINE TO GROUND FAULT IN THE DISTRIBUTION LINE OF MULTIPLE GROUNDING SYSTEM
A method of detecting a voltage sag of a multiple grounding system is disclosed. The method of detecting a voltage sag of a multiple grounding system includes: a step of obtaining a load current in each phase of a neutral line current and a power line by a terminal device provided on a load side; a...
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| Format: | Patent |
| Sprache: | eng ; kor |
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| Zusammenfassung: | A method of detecting a voltage sag of a multiple grounding system is disclosed. The method of detecting a voltage sag of a multiple grounding system includes: a step of obtaining a load current in each phase of a neutral line current and a power line by a terminal device provided on a load side; a step of calculating the vector sum of load currents in each phase; a step of calculating a vector sum combining two phases with the load current of each phase if a phase difference between the neutral line current and the vector sum is greater than or equal to a predetermined first threshold value; and a step of determining that a voltage sag is detected when there is a combination in which a phase difference between the vector sum of the neutral line current and the two phases is within a predetermined second threshold value. So, it is possible to detect a high resistance line to ground fault which cannot be detected by a conventional method.
다중접지계통 단선지락고장 검출 방법이 개시된다. 상기 다중접지계통 단선지락고장 검출 방법은, 부하측에 구비된 단말장치에 의해서, 중성선 전류 및 전력선의 각 상에서의 부하전류를 취득하는 단계; 상기 각 상에서의 부하전류의 벡터합을 계산하는 단계; 상기 중성선 전류와 상기 벡터합의 위상차가 기 정해진 제1 임계치 이상이면, 상기 각 상에서의 부하전류에서 2상을 조합한 벡터합을 계산하는 단계; 및 상기 중성선 전류와 상기 2상을 조합한 벡터합의 위상차가 기 설정된 제2 임계치 이내인 조합이 존재하면, 단선지락고장이 검출된 것으로 판단하는 단계를 포함하여 구성될 수 있다. |
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