Power Quality
Open Delta (V-V) Connections and the 190 V High Leg: Utilisation Factors Explained
Is the utilisation of a V-V connection 0.577 or 0.866? Both — measured against different bases. This report derives each factor, explains the internal 30° displacement, and shows why the high leg of a 110 V/220 V combined service measures 190 V.
14 min read