在变电所中，当低压母线发生故障时，应由（    ）来动作跳闸。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69397' and id < 4492362 and id<>'4492362' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69397' and id > 4492362 and id<>'4492362' order by id asc limit 5