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在变电所试运行过程中(初投或大修后),在变电所母线上有时发生电压突然升高,接地装置误动作,但并非接地事故的异常现象。这时所内母线及五柱表用变压器都出现谐振声,对这种现象往往都判断为供电网路有接地事故,但经多次接地选择仍不能消除,结果造成矿井不能正常供电。由于这
During the trial run of the substation (initial cast or overhaul), voltage suddenly rises in the substation busbar, and the grounding device malfunctions, but it is not an anomaly of the ground accident. In this case, the bus and the five-post meter are all resonated with transformers. This phenomenon is often judged as a grounding fault in the power supply network. However, after many times of grounding selection, it still can not be eliminated. As a result, the mine can not supply power normally. Because of this