通常對(duì)于模擬或數(shù)字繼電器，電流和是通過(guò)外部CT的適當(dāng)?shù)倪B接得到,在這些CT中可能流過(guò)被保護(hù)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(lái)進(jìn)行CT變比的匹配。在UR系統(tǒng)繼電器中，對(duì)于引入繼電器的電流信號(hào)所做的組合,變比修正，求和等預(yù)處理都通過(guò)結(jié)構(gòu)設(shè)置預(yù)先進(jìn)行。

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