大型发电机组短路试验异常分析

某电厂1 000 MW发电机短路试验过程中汽侧汇水管接地线上出现接地电流,大电流导致接地导线熔断,并引发电缆管油漆着火.在没有经验数据的情况下对此现象进行分析及接地导线等更换处理之后,通过缓慢增大发电机电流重新进行试验,分阶段录取汇水接地电流波形、检测接地电流电压等数据,对其进行了分析总结.

Analysis of abnormal phenomena during generator short-circuit tests

In the process of generator short-circuit test for a 1 000 MW unit,large grounding current which occurred on the earth wire of the water pipe on the steam turbine side melted the earth wire and consequently caused fire on the cable coat.After the earth wire was replaced,the test was performed again.The grounding current waves under different currents of the generator were measured during the test and used to analyze the abnormal phenomena of the first test.