摘要
该文以不接地系统发生单相接地故障后的零序网络特征为基础,考虑到零序电流采集时受到的来自负荷电流的影响,提出一种新的基于零序电流相量的故障定位方法。文中定量地分析了架空线路中由电流互感器误差引起的负荷电流零序分量在二次侧输出不为零从而产生的零序不平衡电流,并推导出其数学表达式,应用在定位判据的提出和判据可信度的分析中。最后通过仿真算例,模拟出实际线路零序电流采集时受到的来自不平衡电流的影响,给出了基于零序电流相量故障定位方法在实验环境下的应用。
Considering the influences of load current when measuring the zero-sequence current,a new fault-location method for single-phase ground faults in neutral ungrounded system is presented on the basis of the zero-sequence network＇s characteristics in this paper.A fter analyzing the load current of overhead lines,the effect of the zero-sequence unbalanced current on the measurement of zero-sequence current has been studied.The mathematic representation of zero-sequence unbalanced current caused by the error of current transformer is derived and applied in the credibility analysis of fault-location criterion.In a case study,the effect of zero-sequence unbalanced current on line zero-sequence current is simulated,and the application of the fault-location method based on zero-sequence current is given.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2010年第4期36-40,共5页
Proceedings of the CSU-EPSA
基金
国家高技术研究发展计划(863计划)(2009AA12Z328)
关键词
中性点不接地系统
带电故障定位
单相接地故障
零序不平衡电流
零序电流相量
neutral ungrounded system
fault-location without power-cut
single-phase ground faults
zero-sequence unbalanced current
zero-sequence current phasor
