AT 흡상전류 분배비를 활용한 교류철도 분기선로에서의 고장구간 판별기법 평가

초록

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.

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