This paper introduces an accident case of fuse fusing at the high voltage side of voltage transformer at the outlet of generator due to improper selection of fuse at the high voltage side of the voltage transformer, which causes the wrong operation of the generator stator ground protection when the voltage transformer has a single-phase ground fault and does not cooperate with the generator stator ground protection, and which can not avoid the ferroresonance overvoltage during the operation of the unit Analyze the accident cases and put forward preventive measures.<br>
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