일반철도 배전선로 지락보호시스템에 관한 연구

Abstract

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.