电力系统发生短路故障时，继电保护装置应动作于（  ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id < 4500118 and id<>'4500118' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id > 4500118 and id<>'4500118' order by id asc limit 5