单选题:某220kV变电站内设有两台主变压器,变压器铁芯为冷轧硅钢片,过电压一般不超过下列哪个数值时,可不采取保护措施?(  )

题目内容:
某220kV变电站内设有两台主变压器,变压器铁芯为冷轧硅钢片,过电压一般不超过下列哪个数值时,可不采取保护措施?(  ) A.411.5kV
B.291.0kV
C.617.3kV
D.436.5kV

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