中性点不接地电力系统发生单相接地时，流过故障线路的零序电流为(  )。（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id < 4494851 and id<>'4494851' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id > 4494851 and id<>'4494851' order by id asc limit 5