变压器中性点经小电阻接地的主要目的是(  )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69516' and id < 4503565 and id<>'4503565' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69516' and id > 4503565 and id<>'4503565' order by id asc limit 5