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基于全并聯AT供電方式的T-F短路故障測距及仿真研究

來源：電工電氣發布時間：2023-02-07 09:07 瀏覽次數：637

基于全并聯AT供電方式的T-F短路故障測距及仿真研究

柳敬

(中交機電工程局有限公司，湖北武漢 430061)

摘要：全并聯電壓互感器 (AT) 牽引供電普遍應用于我國的高速鐵路牽引網中，當供電系統發生各種短路故障時，不迅速切除故障和盡快繼續穩定供電，可能會影響鐵路系統的正常運行甚至發生很嚴重的安全事故。介紹了高速鐵路最常用的牽引供電方式——全并聯 AT 供電，在此基礎上對牽引網發生 T-F 短路故障進行了電氣計算和理論分析，并提出了精確度高、不受外部因素影響的“橫聯線電流比”故障測距原理；根據實際運行線路，設置 AT 供電牽引網的參數，并在 MATLAB 軟件中建立仿真模型，對提出的短路故障測距原理進行仿真驗證分析，得出故障測距仿真的正確結果，證明了理論分析的正確性。

關鍵詞： AT 牽引供電；T-F 短路；故障測距；電氣化鐵路

中圖分類號：TM922.3 文獻標識碼：A 文章編號：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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基于全并聯AT供電方式的T-F短路故障測距及仿真研究