摘要
由于单相接地故障所引发的电压互感器TV保险熔断问题在中压配电网中性点不接地系统中经常发生,利用注入虚拟补偿电量法对其进行数值暂态分析,通过建立单相故障时的等效电路,分析TV的电磁特性,推导TV电流的暂态方程,指出影响保险熔断的主要因素是线路长度和故障切除角度,并利用Matlab及10 kV高压物理试验给予验证。
In neutral ungrounded system the melting fuse takes place frequently due to single-phase-to-earth fault. This paper focuses on the transient analysis of the above over-current phenomenon by using method of injection dummy compensation variable （MIV）. Base on the equivalent circuit and the electromagnetic character of TV, we deduce the transient equation of TV current and find out the essence reason of melting fuse mainly caused by the length of lines and the different fault-cut-off angle. With computer simulation （MATLAB） and experimental study in the laboratory （the 10 kV high voltage physical simulating system）, it verified the precision of the analysis result in this paper.
出处
《吉林电力》
2006年第4期8-12,共5页
Jilin Electric Power
