下列不属于变压器差动保护不平衡电流来源的是(   )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69519' and id < 4503809 and id<>'4503809' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69519' and id > 4503809 and id<>'4503809' order by id asc limit 5