空载线路合闸时，产生过电压的根本原因是（）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32668' and id < 2598432 and id<>'2598432' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32668' and id > 2598432 and id<>'2598432' order by id asc limit 5