在双母线内部发生故障时，由小差元件来判断具体的故障母线，同时启动大差回路（ ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69493' and id < 4501616 and id<>'4501616' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69493' and id > 4501616 and id<>'4501616' order by id asc limit 5