Fault location estimation technique for AC railway power supply system considering of the other line’s at boosting current characteristics

This paper presents an improved fault location estimation algorithm to reduce the fault location estimation error ratio in AT boosting current ratio technique. The domestic AC traction system uses the AT feeding system as a standard, and most of the lines are composed of double tracks(up and down lines). It was confirmed that the fault location estimation error is increased due to the change of the AT boosting current of the faulted line due to the other line’s AT boosting current characteristics. Therefore, in this paper, an improved fault location estimation algorithm is proposed by using all AT boosting currents considering of the other line’s boosting current characteristics. In order to evaluate the proposed algorithm performance, the AC railway power supply system is modeled and various fault simulations were performed using the power analysis program. As a result, when comparing the error of the existing technique and the improved technique, the improved algorithm shows an average error of 0.16%, and even the maximum error is 0.88%, which is satisfied within 2% of the domestic standard. Copyright © The Korean Institute of Electrical Engineers