It is difficult to design and build an effective power line EMI filter for switched mode power supply without distinguishing the differential or common mode component from conducted noise.
诊断开关电源传导干扰的主要性质，分别测量共模干扰和差模干扰，是正确设计电源EMI滤波器的第一步。
Digital transformer differential protection may falsely take effective when external single-phase earth fault occurs at star side or the line endures lightning strike on single phase.
数字式变压器差动保护在星形侧发生外部单相接地或线路单相遭雷击的情况下，差动保护有时会误动。
If the differential expansion is beyond the guard - line and no effective measures are taken to control the differential expansion, the only way is to switch off and stop the turbine.
当胀差超过警戒值时，如没有控制汽轮机胀差的有效措施，只能打闸停机。
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