一种输电线路超高速方向保护方法  

A Method for Directional Ultra-High-Speed Protection of Transmission Lines

作　　者：郭振威[1,2] 姚建刚[1] 康童[1] 袁旭龙[3] 贺天良 石赛美[3] Guo Zhenwei Yao Jiangang Kang Tong Yuan Xulong He Tianliang Shi Saimei(College of Electrical ＆ Information Engineering Hunan UniversityChangsha 410082 China College of Mechanical and Control Engineering Electromechanical Engineering CollegeGuilin University of Technology Guilin 541004 China Department of Electrical Engineering Shaoyang University Shaoyang 422000 China 92665 Troop 13 Detachment Cili 427200 China)

机构地区：[1]湖南大学电气与信息工程学院 [2]桂林理工大学机械与控制工程学院 [3]邵阳学院电气工程系 [4]92665部队13分队

出　　处：《电工技术学报》2016年第22期168-177,共10页Transactions of China Electrotechnical Society

基　　金：湖南省教育厅科研项目基金资助项目(13C840)

摘　　要：通过深入分析故障暂态电流在超高压母线系统中的传播特性、故障初始角与暂态电阻对故障高频暂态电流能量影响,首先将母线两侧故障高频暂态电流的能量作差,然后将故障高频暂态电流能量差按照故障初始角与暂态电阻进行归算,利用归算后的故障高频暂态电流能量差可以准确判断故障方向。根据线路两端的方向判断结果便可准确判断被保护线路是否故障。该保护方法消除了故障初始角与暂态电阻对暂态保护的影响,具有高可靠性和灵敏度。在三相500k V电力系统中,考虑各种典型故障情况,使用ATPDraw对该算法进行了大量仿真分析。仿真结果表明,应用该算法实现超高输电线路的超高速保护是可行的。A new directional protection of EHV power transmission lines was presented based onthe propagation characteristics generated by fault high transient current. In the procedure, the energydifference of fault induced high transient current was obtained from the two lines connected with thesame bus. Then, the energy difference was normalized by initial fault angle and transient resistance.According to the normalized energy difference, the positive direction of fault can be correctlydiscriminated from negative direction. Based on the fault directions of the line at two endings, whethera fault occurs on the protected line can be determined. The proposed method eliminated the influence ofthe initial fault angle and transient resistance, and has high reliability and sensitivity. Simulation resultsverified the feasibility of the method for EHV transmission lines.

关 键 词：故障初始角 暂态电阻 方向保护 输电线路 

分 类 号：TM771[电气工程—电力系统及自动化]