单选题:220kV电力系统中,线路断路器变电所侧的相对地工频过电压水平一般不宜超过下列哪项数值?(  )

题目内容:
220kV电力系统中,线路断路器变电所侧的相对地工频过电压水平一般不宜超过下列哪项数值?(  ) A.145kV
B.165kV
C.189kV
D.252kV

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