摘要
提出一种注入方波信号的经消弧线圈接地系统故障选线方法。通过从故障相电压互感器向系统注入一特定频率的方波信号,探测各支路零序电流,并分析其基波与3次谐波电流幅值之间的关系来确定故障线路。详细分析了注入方波信号的单相接地故障选线原理并提出了选线判据。模拟实验结果证明该方法能准确、稳定、快速地实现故障选线,检测精度高且能有效地排除系统对地电容的影响。
A new method for fault line selection in distribution system with arc suppression coil grounding with square-wave signal injection is proposed.A low frequency square-wave signal is injected from the secondary side of bus voltage transformer,the phase currents flowing through each feeder are detected,and then the relationships of the amplitudes of their fundamental and the third harmonic components are analyzed to select the fault line.The principle of the method is introduced in detail,and the criterion of fault line selection is proposed as well.The analogical test results show that the method has good ability to eliminate the influence of distributed capacitance and the detection accuracy is improved with large grounding resistance.
出处
《电力系统自动化》
EI
CSCD
北大核心
2012年第4期91-95,共5页
Automation of Electric Power Systems
关键词
方波信号
经消弧线圈接地系统
单相接地
故障选线
配电网
square-wave signal
power system with arc suppression coil grounding
single-phase grounding fault
fault line selection
distribution networks
