当发电厂采用单母线，母线上发生故障时，应由(   )来动作跳闸。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69519' and id < 4503806 and id<>'4503806' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69519' and id > 4503806 and id<>'4503806' order by id asc limit 5