带放电间隙的分级绝缘变压器可以选用下列哪些保护作为接地后备保护（ ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69493' and id < 4501561 and id<>'4501561' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69493' and id > 4501561 and id<>'4501561' order by id asc limit 5