中性点不接地系统发生单相接地时，流过故障点电流为(  )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69509' and id < 4503077 and id<>'4503077' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69509' and id > 4503077 and id<>'4503077' order by id asc limit 5