变压器一次侧供电电压保持不变，当二次侧由额定负载过度到空载运行状态，主磁通将（     ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id < 4421420 and id<>'4421420' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id > 4421420 and id<>'4421420' order by id asc limit 5