大电流接地系统发生不对称接地短路时，变压器接地中性线上电流等于 (    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69507' and id < 4502811 and id<>'4502811' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69507' and id > 4502811 and id<>'4502811' order by id asc limit 5