采用单母线分段的主接线，当分段断路器闭合运行时，如果某母线上发生故障，继电保护动作首先跳开（  ）。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69483' and id < 4500436 and id<>'4500436' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69483' and id > 4500436 and id<>'4500436' order by id asc limit 5