补偿电网单相接地故障选线的定量研究  

Quantitative Research on Fault Line Selection When Single-phase Grounding in Compensation Networks

作　　者：王石川[1] 王德江[2] 

机构地区：[1]西安电子科技大学通信工程学院,陕西西安710126 [2]辽宁工业大学,辽宁锦州121001

出　　处：《辽宁工业大学学报（自然科学版）》2016年第2期91-95,共5页Journal of Liaoning University of Technology(Natural Science Edition)

摘　　要：为了揭示补偿电网单相接地时故障线路和最长非故障线路的暂态零序电流的差别,找到符合实际的故障选线判据,从补偿电网单相接地时的原形电路及其参数出发,采用回路电流法,对通过接地点的相关回路分别计算零序电流,然后再根据基尔霍夫电流定律,计算故障线路和最长非故障线路的暂态零序电流。通过对故障线路和最长非故障线路的暂态零序电流的定量研究,得到其幅值、极性、衰减时间、暂态零序电荷数量的差别,给出了故障选线的新判据,即线路中暂态零序电荷最多、衰减时间最长的线路为故障线路。经Matlab仿真分析,证明该判据是准确可靠的。In order to reveal the difference of fault line and non fault line＇s transient zero sequence current when single-phase grounding in compensation networks, and find the identification to the fault line selection, when single-phase grounding in compensation grid according to the original shape electric circuit and its parameter, and Loop current method, we can calculate zero sequence current when the ground point＇s relevant loop is passed, through Kirchhoff＇s law, we can easily calculate the transient zero sequence current of the fault line and the longest non fault line. Through quantitative research on transient zero sequence current of the fault line and the longest non fault line, its information can be obtained, such as the amplitude, the polarity, the decay time, the difference of the quantity of transient zero sequence charge can also be obtained. A new criterion for fault line selection is given. Line of most transient zero sequence charge and decay time is fault line in all lines. It has been confirmed that the identification is accurate and reliable through Matlab＇s simulation analysis.

关 键 词：补偿电网 原形电路 暂态零序电流 故障选线 定量研究 

分 类 号：TM771[电气工程—电力系统及自动化]