系统发生故障时继电保护装置的任务是（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69393' and id < 4491994 and id<>'4491994' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69393' and id > 4491994 and id<>'4491994' order by id asc limit 5