增设变压器的差动速断保护的目的是为了（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69380' and id < 4491631 and id<>'4491631' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69380' and id > 4491631 and id<>'4491631' order by id asc limit 5