寄生回路引起的TWJ异常的案例分析

Case Analysis of TWJ Anomaly Caused by Parasitic Circuit

对在一起220kV线路单相瞬时性接地故障中,虽然保护装置均正确动作,但是操作箱开关位置不正确显示的案例进行分析,发现操作箱在合闸监视回路与合闸回路并接且取消操作箱防跳的情况下存在寄生回路,操作箱不能正确显示开关位置。

For a single-phase transient fault of a 220 kV transmission line,although the protective devices operate correctly,but the switch position of the operation box is not correctly dispalyed.Inview of this case analysis,it is found that there is a parasitic cirtuit in the operation box when the closing monitoring circuit and the closing circuit are connected and the anti-tripping of the operation box is canceled.The operation box cannot display the switch position correctly.