일반철도 배전선로 지락보호시스템에 관한 연구

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배전선로 지락보호시스템
The receiving and distribution power system of the railway receives the electronic power through double-circuit lines from KEPCO and sends it back to each station. This system uses a voltage of 22,900 from the direct grounding system and a voltage of 6,600 from the non-grounding system. If short-circuit faults occur in this receiving and distribution power system, the damage of electronic equipment are caused by overcurrent, leading the malfunction of the facilities in a station. As this kind of accident could threat the safe and stable operation of trains, it is required to be repaired as soon as possible.
If line-to-ground faults happen and are not handled in a short time, they could become the main reason of various disasters such as electric shocks and fire as well as do harm to workers and passengers. As these line-to-ground faults has the possibilities to arouse the short circuits, it should be dealt with in a short time.
The purpose of this study is to figure out the causes and detecting means of line-to-ground faults and investigate the cases of malfunction in OCGR to remain the stable operation in power protection system in electric power facilities.
Alternative Title
A Study on the Ground Fault Protection System for Railway Distribution Line
Alternative Author(s)
Sol Bae
산업기술융합대학원 전기기술융합공학과
Awarded Date
2018. 2
Table Of Contents
Ⅰ. 서론 1
Ⅱ. 접지의 종류와 계통보호 2
A. 접지의 종류 2
1. 계통의 접지 2
2. 직접접지 방식 3
3. 비접지 방식 4
4. 저항접지 방식 5
B. 접지방식에 따른 보호방법 6
1. 직접접지 방식 6
2. 비접지 방식 8
3. 저항접지 방식 9
C. 지락보호계전기의 동작요인 10
1. 절연의 파괴 10
2. 절연 열화 11
3. 부하의 불평형 12
Ⅲ. 지락보호계전기의 오동작 14
A. 오동작의 원인 14
1. 일반철도 배전선로 장애 발생 사례 14
2. 불평형 전류에 의한 영상전류 증가 17
B. 오동작 개선 대책 18
1. 방향성 지락계전기(DOCGR) 18
2. 부하불평형률 해소를 통한 고조파의 저감 19
C. 고려사항 20
Ⅳ. 결론 21
참 고 문 헌
조선대학교 산업기술융합대학원
배솔. (2017). 일반철도 배전선로 지락보호시스템에 관한 연구
Appears in Collections:
Engineering > Theses(Master)(산업기술창업대학원)
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