2.與精確的校驗角一起，它可以為CT及VT的角度誤差提供補償，以便有更靈敏的定值。3.當(dāng)電壓信號是從三角.星形連接的變壓器的后部測得時，它可以提供需要的方向性,而且需要相角補償。例如,有功過功率特性是通過將定值功率方向1(2)靈角設(shè)為“0°”而實現(xiàn)的，無功過功率是通過將定值功方向1(2)靈敏角設(shè)為“180°”,無功低功率將定值功方向1(2)靈敏角設(shè)為“270”。

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