基于残流增量法的谐振接地系统单相接地故障选线

Singlephase Earth Fault Line Selection of Resonant Grounding System Based on Residual Current Incremental Method

文章详细介绍了残流增量法的装置结构和基本原理。该方法通过控制与消弧线圈并联或串联的电抗器,在故障发生后改变消弧线圈的补偿度,利用调节前后的各条线路零序电流的变化量确定故障线路及故障区域。文中对残流增量法的选线策略进行了改进处理,对一、二级线路发生单相接地故障的情况分别进行了分析,并给出了合理的选线流程。该方法不仅能够确定一级变电站的故障线路,而且能够在一级变电站与二级变电站(或开闭站)之间的辐射状线路上确定故障区域。

The paper describes the device structure and basic principle of residual current incremental method.The method is that controls with the arc-suppression coil in series or parallel reactors,and changes the compensation degree of arc suppression coil after the accident,as well as detects the fault line and fault area by adjusting the various lines zero-sequence current＇s variation.The paper improves the selection strategy of residual current incremental method,and analyses single-phase grounding fault situation of primary and secondary lines,as well as gives the reasonable selection process.This method is not only able to identify the fault line of primary substation,but also to identify the fault area of radial lines between primary and secondary substations.