同时故障 meaning in English

simultaneous faults

For fire grounding , grounded impedance varies greatly because of air dissociation , and this causes protection set to startup and resume again and again . therefore , the main protection of the fault line ca n ' t cut off the fault quickly and accurately , and may lead to overstep tripping of near lines " protection sets and eventually cause more serious faults on the power system
同时故障电流一般比较小，电流突变也很小，有时呈缓慢上升的变化趋势，对火焰接地来说，由于空气游离的缘故，接地阻抗变化很大，使现有保护反反复复启动、恢复，可能会导致相邻线路、设备的保护越级跳闸，使电力系统出现更严重的故障。