Question

Derive an expression for computing the per unit voltage regulation of a transformer both for lagging and leading power factors,​

Answer 1

Answer:

Voltage Regulation of Transformer for Lagging Power Factor

Say lagging power factor of the load is cosθ2, that means angle between secondary current and voltage is θ2. Here, from the above diagram, Angle between OC and OD may be very small, so it can be neglected and OD is considered nearly equal to OC i.e.