一种输电线路超高速方向保护方法

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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500kV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。

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	郭振威
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	贺天良
	石赛美

关键词 ：故障初始角, 暂态电阻, 方向保护, 输电线路

Abstract：A new directional protection of EHV power transmission lines was presented based on the propagation characteristics generated by fault high transient current. In the procedure, the energy difference of fault induced high transient current was obtained from the two lines connected with the same 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 correctly discriminated from negative direction. Based on the fault directions of the line at two endings, whether a fault occurs on the protected line can be determined. The proposed method eliminated the influence of the initial fault angle and transient resistance, and has high reliability and sensitivity. Simulation results verified the feasibility of the method for EHV transmission lines.

Key words： Fault initial angle transient resistance directional protection transmission line

收稿日期: 2015-08-17 出版日期: 2016-12-02

PACS:

TM771

基金资助:湖南省教育厅科研项目基金资助项目（13C840）

作者简介: 郭振威男,1974年生,博士研究生,主要从事电力系统保护与控制、电力系统自动化的研究工作。E-mail:gzwcbf@163.com（通信作者）;姚建刚男,1952年生,教授,博士生导师,主要从事电力系统自动化和电力市场方面的教学与科研工作。E-mail:yaojiangang@126.com

引用本文:

郭振威, 姚建刚, 康童, 袁旭龙, 贺天良, 石赛美. 一种输电线路超高速方向保护方法[J]. 电工技术学报, 2016, 31(22): 168-177. Guo Zhenwei, Yao Jiangang, Kang Tong, Yuan Xulong, He Tianliang, Shi Saimei. A Method for Directional Ultra-High-Speed Protection of Transmission Lines. Transactions of China Electrotechnical Society, 2016, 31(22): 168-177.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I22/168

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