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宜兴抽水蓄能4号机组起动调试中,为了检验500 kV保护用电流互感器极性以及连接的正确性,进行了发变机组零起升流试验,介绍了试验过程中出现的异常现象,分析故障,找到了试验失败的原因是一组应处于分闸位置的500 kV接地闸刀有二相在合闸位置,据此,对500 kV闸刀、地刀操作提出了具体要求。
Yixing Pumped Storage Unit 4 in the start-up and commissioning, in order to test the polarity of the 500 kV protection current transformer and the correctness of the connection, the generator unit zero-rise up-flow test was carried out. The anomalies that occurred during the test were introduced and analyzed Failure, found the reason for the failure of the test is a group of 500 kV grounding switch should be in the sub-gate position has two phases in the closing position, accordingly, 500 kV knife, floor knife operation made specific requirements.