基于特征频带内暂态零序电流特点的配电网单相接地故障选线方法  

Faulty line selection by comparing the amplitudes of transient zero sequence current in the special frequency band for power distribution networks

作　　者：张保会[1] 赵慧梅[1] 张文豪[1] 徐靖东[1] 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049

出　　处：《电力系统保护与控制》2008年第13期5-10,共6页Power System Protection and Control

基　　金：国家自然科学基金项目(50277027)~~

摘　　要：提出了一种新的采用特征频带内暂态零序电流集中式比较单相接地故障的自适应选线原理,设计了两种选线算法:提取各馈线中特征频带内的暂态零序电流幅值并进行相对比较,算法可以随系统运行方式变化、故障条件变化自适应的捕捉特征频带内暂态电流分量。当故障初始角较小、过渡电阻很大暂态分量很小时,采用零序电流有功低频分量幅值比较算法。该算法可适用于中性点不接地、非直接接地系统单相接地故障的各种情况。ATP仿真数据和现场实录数据的测试表明,综合选线方法具有很高的准确性和灵敏度,算法已经应用于YH-B811小电流选线装置中。This paper proposes a faulty-line-selection （FLS） method of comparing zero sequence transient currents in all feeders for power distribution networks. The method synthetically utilizes two algorithms. The first algorithm is to select the faulty line by comparing the transient amplitudes of zero sequence currents in the special frequency band, which is the first capacitive band and can be captured adaptively. The second FLS algorithm is by comparing the active-component amplitudes of zero sequence current in low frequency band （about 50 Hz）. The proposed FLS method is tested with ATP simulation and field-recorded data, and the test results show that the synthetic method is suitable to all kinds of faulis in non-solid earthed networks and works sensitively and accurately. This algorithm has been adopted in YH-B 811 equipment.

关 键 词：单相接地选线 暂态零序电流 特征频带 有功分量 

分 类 号：TM862[电气工程—高电压与绝缘技术]