Excerpt from Accuracy of the Formulas for the Ratio, Regulation, and Phase Angle of Transformers
In the derivation, to avoid confusion or was taken positive when the phase relations were as shown in figure I. In the final formulas given below, however, the sign has been chang... ed so that the phase angle is positive when the reversed secondary voltage leads the primary. When 3; signs occur the upper sign should be used for lagging and the lower for leading secondary current.
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