变压器差动保护防止穿越性故障情况下误动的主要措施是（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69380' and id < 4491628 and id<>'4491628' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69380' and id > 4491628 and id<>'4491628' order by id asc limit 5