The symmetric inrush of power transformer is a complex problem recently.
对于电力变压器的对称励磁涌流，目前还是一个棘手的问题。
Inrush identification is always a key problem in power transformer current differential protection.
励磁涌流识别一直是电力变压器差动保护中比较关注的问题。
Water inrush has always been a serious problem in safety work of mine enterprise.
矿井突水一直是困扰矿山企业安全生产的突出问题。
Water inrush has always been a serious problem in safety work of mine enterprise.
矿井突水一直是困扰矿山企业安全生产的突出问题。
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