题目内容

检修时当套管水平存放,安装就位后,带电前必须进行静放,静放时间要求为()

A. 500kV套管静放时间应大于36小时
B. 500kV套管静放时间应大于72小时
C. 110~220kV套管静放时间应大于24小时
D. 110~220kV套管静放时间应大于48小时

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