Question

The ideal transformer windings are eliminated from the per-unit equivalent circuit of a transformer.

(a) True (b) False

Short answer

Therefore, the correct option is (a) True

Step-by-step solution

The formula’s used in the per unit system.

The voltage in per unit system,

$V_{p.u.}=\frac{V_{actual}}{V_b}$

The current in per unit system,

$I_{p.u.}=\frac{I_{actual}}{I_b}$

The impedance in per unit system

$Z_{p.u.}=\frac{Z_{actual}}{Z_b}$

In the above formula’s represent the base value of the system.

Effect on impedance, voltage and current in per unit system.

In case of the per unit system, when the voltage, current and impedance is transferred from one side to the other side the quantity remains the same.

So, it is true that the ideal transformer winding is eliminated from the per unit equivalent circuit of a transformer.