Mobile QR Code QR CODE : The Transactions of the Korean Institute of Electrical Engineers
Title An Evaluation of Fault Zone Discrimination Technique Using Real Time AT Absorbing Current Distribution Ratio in AC Railway Branch Line
Authors 정호성(Hosung Jung) ; 신승권(Seungkwon Shin) ; 김형철(Hyungchul Kim) ; 김길동(Gildong Kim) ; 민명환(Myung-Hwan Min) ; 안태풍(Tae-Pung An)
DOI https://doi.org/10.5370/KIEE.2020.69.10.1504
Page pp.1504-1511
ISSN 1975-8359
Keywords AC railway branch line; AT absorbing current distribution ratio; fault location estimation; fault zone discrimination
Abstract This paper presents a fault zone discrimination and more accurate fault location estimation technique in the AC railway system with a branch line. For this, we propose fault zone discrimination technique using real time AT absorbing current distribution ratio and fault location estimation technique using all AT absorbing current in the branch line. And, we also consider another line's AT absorbing current characteristics to calculate fault location. In order to evaluate the performance of the proposed technique, we test low voltage artificial forced short fault between traction line and rail in real operation branch line. As a field test result, we verify that each AT absorbing current distribution ratio index is constant to each fault zone. And, we model the AC traction power supply system with a branch line using power analysis program(PSCAD/EMTDC) to evaluate fault estimation error of the proposed technique. As a simulation result, when comparing the error of the conventional technique and the proposed technique, the conventional technique shows maximum 0.475km(4.39%) in the main line and maximum 1.727km(12.10%) in the branch line.
However, the proposed technique shows under 1.0% error in all fault zone, which is satisfied within 2% of the domestic standard.