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基于全并联AT供电方式的T-F短路故障测距及仿真研究

来源：电工电气发布时间：2023-02-07 09:07 浏览次数：269

基于全并联AT供电方式的T-F短路故障测距及仿真研究

柳敬

(中交机电工程局有限公司，湖北武汉 430061)

摘要：全并联电压互感器 (AT) 牵引供电普遍应用于我国的高速铁路牵引网中，当供电系统发生各种短路故障时，不迅速切除故障和尽快继续稳定供电，可能会影响铁路系统的正常运行甚至发生很严重的安全事故。介绍了高速铁路最常用的牵引供电方式——全并联 AT 供电，在此基础上对牵引网发生 T-F 短路故障进行了电气计算和理论分析，并提出了精确度高、不受外部因素影响的“横联线电流比”故障测距原理；根据实际运行线路，设置 AT 供电牵引网的参数，并在 MATLAB 软件中建立仿真模型，对提出的短路故障测距原理进行仿真验证分析，得出故障测距仿真的正确结果，证明了理论分析的正确性。

关键词： AT 牵引供电；T-F 短路；故障测距；电气化铁路

中图分类号：TM922.3 文献标识码：A 文章编号：1007-3175(2023)01-0028-06

T-F Short-Circuit Fault Location and Simulation Research

Based on All-Parallel AT Power Supply Mode

LIU Jing

（CCCC Electromechanical Engineering Co., Ltd, Wuhan 430061, China）

Abstract: AT traction power supply has been widely used in high-speed railway traction network. When short-circuit faults occur in the power supply system, if the faults are not removed and the power supply does not continue in a stable way as soon as possible, the normal operation of railway system could be affected and serious safety accidents could happen. In this paper, the traction power supply mode commonly used in high-speed railway-all-parallel AT power supply is introduced. The electrical calculation and theoretical analysis of T-F short-circuit faults happening in the traction network are carried out, and the principle of fault location based on “the current ratio of paralleling lines” is put forward, which is highly accurate and not affected by external factors. Then, according to the actual operating line, the author sets up parameters of the power supply traction network and establishes the simulation model in MATLAB. After making simulation analysis of the principle of short-circuit fault location, the simulated right results are obtained which verifies the correctness of the above theoretical analysis.

Key words: AT traction power supply; T-F short-circuit; fault location; electrified railway

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