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민명환(Myung-Hwan Min),정호성(Hosung Jung),박영(Young Park),창상훈(Sang-Hoon Chang),신명철(Myong-Chul Shin) 대한전기학회 2012 전기학회논문지 Vol.61 No.3
Nowadays, in metropolitan railroad, DC feeding system is being generally applied. In order to reduce damage of electro-chemical corrosion caused by stray current and leakage current, in DC feeding system, rail is used as negative-polarity return conductor for traction load current. However, it has problem of rail potential increase and there are no adequate measures to prevent it in domestic. The rise of rail potential leads to damage for human and equipments. To solve the problems, this paper presents fundamental theory and related standards about rail potential increase. And then, we analyzed field testing data and simulated a variety of operations by using PSCAD/EMTDC as an analysis program of power system. In addition, this paper suggests rail potential limit device and addresses how to the device. To verify the effect, simulation of DC feeding system before and after the application of the device is carried out in various cases.
도시철도 직류 비접지 급전계통에서의 선택 지락보호시스템의 성능평가
정호성(Hosung Jung),김주욱(Joouk Kim),신승권(Seongkuen, Shin),김형철(Hyungchul Kim),안태풍(Taepung An),윤준석(Junseok Yun) 대한전기학회 2012 전기학회논문지 Vol.61 No.12
This paper presents to verify the selective grounding fault protective relaying technique for the ungrounded DC traction power supply system. This system selectively blocks fault section when grounding fault occurred. In order to perform this verification, field test facilities have been installed on Oesam substation and Worldcup-Stadium substation, and field test process has been suggested. Also, selective grounding fault protective relaying components and rail voltage reduction device have been tested with the various trial examinations. In order to compare and evaluate performance of the selective grounding fault protective relaying function, field test system was modeled and the system fault simulation results were compared and evaluated with the field test result. Performance of selective grounding fault protective relaying function was evaluated with the above-mentioned process, and the fact that the system recognizes fault section irrespective of insulation between rail and ground and fault resistance from grounding fault.