一起多套保护装置同时动作的分析

Fault Analysis of Simultaneous Operation of Multiple Protective Devices

摘要:

文中结合保护装置动作录波情况，对一起多套保护装置同时动作的事故进行分析。某变电站进线断路器线路电压互感器发生爆炸，引起该间隔线路保护、相邻间隔线路保护以及上一级变电站线路保护、主变压器中后备保护同时动作。由于保护配合貌似不合理，对故障波形和保护动作情况进行了深入的分析和探讨，发现此次故障期间发生了多次短路故障转换，各保护装置配合并无问题，保护装置均为正确动作。

Abstract:

Combined with the action recording of protection device, an accident in which multiple sets of protection devices act at the same time is analyzed. The explosion takes place in the voltage transformer of incoming switch line in a substation, and this causes the simultaneous action of the line protection of this interval and line protection of adjacent interval as well as line protection of the upper substation and backup protection in the main transformer. Because the protection coordination seems unreasonable, the fault waveform and the protection action are analyzed and discussed in depth. It is found that during this fault,there are many times of shortcircuit fault conversion, there is no problem in the cooperation of various protection devices, and the protective devices acted correctly.