变压器的过电流保护，加装复合电压闭锁元件是为了（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69380' and id < 4491623 and id<>'4491623' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69380' and id > 4491623 and id<>'4491623' order by id asc limit 5