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突变量理论广泛应用于电力系统微机保护。
The fault component principle is widely used in power system protective relaying since it has lots of advantages.
它也可与负序电流突变量起动元件配合，构成一套变压器主保护。
It can be combined with a set of transformer main protection by combining negative-phase sequence current sudden-change starting element.
对目前实用的突变量及稳态量选相元件进行了比较，指出了其特点和存在的不足。
Currently used fault phase selector components are compared and their characteristics and shortcomings are pointed out.
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