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| Research on the Fault Location Method of Direct Power Supply Traction Network with Reinforced Line |
| WEI Jianzhong1, GUO Xiaoxu2, GAO Shibin1 |
1. Southwest Jiaotong University, Chengdu, Sichuan 611756, China;
2. Electrification & Telegraphy Engineering Design Research Department, China Railway Design Corporation, Tianjin 300308, China |
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Abstract Research purposes:The passenger dedicated line with a speed of 250 km/h can adopt the direct power supply system, and reinforced line can be added in some section. Because the impedance of the contact wire and the reinforced line is not consistent, when the electric traction network fails, the conventional fault location device using the reactance method can not achieve accurate fault location in the power supply section with the reinforced line. This paper first analyzes the problems of conventional fault location using reactance method based on the short-circuit test data of actual operation lines; secondly, for different types of short-circuit faults, the short-circuit impedances of contact wire and reinforced line of up-down electric traction network are derived; then, the spatial distribution of contact wire and reinforced line impedances is comprehensively evaluated, and a new fault location method is proposed; finally, based on DDRTS, the simulation analysis of electric traction network short-circuit fault is carried out.
Research conclusions:(1) Combined with the short-circuit test data of the actual operation lines, the fault location using reactance method used in the traction substation is proved to be defective. (2) The short-circuit impedances of contact wire and reinforced line of up-down electric traction network are derived. The simulation curve of the spatial distribution of the short-circuit impedance of the traction network is consistent with the overall distribution law of the curve derived theoretically. The simulation results are consistent with the theoretical analysis. (3) The method proposed in this paper can provide technical reference for accurate fault location of direct power supply system of electrified railway with reinforced line.
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Received: 20 December 2022
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2023, Vol. 40 
