中性点间接接地电网的故障线路选定研究  

Faulty Line Shooting of Neutral Indirect Grounding Power System

作　　者：王亮[1] 李瑞[1] 冯俊杰[2] 

机构地区：[1]国网山西省电力公司电力科学研究院,山西太原030001 [2]国网山西省电力公司检修公司,山西太原030032

出　　处：《山西电力》2017年第4期20-23,共4页Shanxi Electric Power

摘　　要：中性点间接接地方式普遍应用于我国配电网系统中,该方式线路当发生单相接地短路时,线路断路器不会立即跳闸,电网运行可靠性得到提高,但故障如果长期存在,将严重劣化线路的绝缘性能。在理论分析的基础上,研究了中性点间接接地电网在一相短路故障时,产生的零序高频电流,通过电磁暂态仿真软件搭建模型进行了仿真观察。研究得出:中性点间接接地电网发生线路一相短路故障时,故障线路的零序高频电流的起始半波幅值远高于正常运行线路,并且二者相位相反。最后提出一种故障信号处理方法,提高了故障线路选定的准确性。The mode of neutral indirect grounding is extensively applied inpower distribution networks. When single-phase grounding short-circuit occurs, circuit breaker of the faulty line will not trip promptly under this mode so that it improves the reliability of power grid operation. However, if the fault exists for long time, insulation performance of lines will be deteriorated. Based on theoretical analysis, the paper studied the features of transient zero sequence high-frequency current when single-phase grounding fault occurs.In addition, simulation was established through the software of PSCAD as a result of validation. The researches show that comparing with the non-faulty line, the amplitude of initial half-wave of transient zero sequence current of the faulty line is much higher, and the phase is reverse. A method of data processing of fault information was provided, which could improve the accuracy of faulty line shooting.

关 键 词：间接接地 零序高频电流 故障线路查找 

分 类 号：TM862[电气工程—高电压与绝缘技术]