在中性点不接地系统中发生单相接地故障时，流过故障线路始端的零序电流（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69376' and id < 4491207 and id<>'4491207' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69376' and id > 4491207 and id<>'4491207' order by id asc limit 5