摘要
以故障时刻暂态零序电流为故障特征信息,充分利用其幅值、极性及伪斜率等信息,提出了一种小电流接地系统故障选线新方法。根据提出的自映像算法及伪积分算法,求取出各条分支线路故障特征值,通过比较故障特征值的大小及极性判定故障线路。大量仿真表明,该方法在不同电压初相角、不同接地电阻情况下,均能准确判定出故障分支线路,选线准确、可靠性高。
The new method of low-current grounding system fault line selection method is proposed takes the transient zero sequence current at the fault moment as fault features information, fully uses its amplitude, polarity and slope information. According to self-reflection and pseudo-integral methods, the fault features value is gained of each branch line. The fault line is judged by comparing size and polarity of the fault feature value. A lot of simulation tests indicate that this method can correctly judge fault branch line under the circumstance of different voltage phase angle and various grounding resistance with high accuracy and reliability.
出处
《煤矿机电》
2013年第1期18-21,共4页
Colliery Mechanical & Electrical Technology
关键词
故障选线
零序电流
伪斜率
自映像
伪积分
fault line selection
zero-sequence current
pseudo-slope
self-reflection
pseudo-integral
