通常對于模擬或數(shù)字繼電器,電流和是通過外部CT的適當?shù)倪B接得到,在這些CT中可能流過被保護元件的任何一部分的電流。如果用于求和的一次CT的變比不一致,就需要附加CT來進行CT變比的匹配。在UR系統(tǒng)繼電器中,對于引入繼電器的電流信號所做的組合,變比修正,求和等預處理都通過結構設置預先進行。
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