Question

Problem 1: Consider a transformer with a turns ratio of 4000/120, with a primary coil resistance R1 = 1.6 (?), a secondary coil resistance of R2 = 1.44 (m?), leakage flux that corresponds to the inductance L1 = 21 (mH), and inductance L2 = 19 (?H), and a realistic core characterized by the core resistance Rc = 160 (k?) and the magnetizing inductance Lm = 450 (H). The low-voltage side of the transformer is at 60 (Hz), and V2 = 120 (V), and the power there is P2 = 20 (kW) at pf = 0.85 lagging. Calculate the voltage at the high-voltage side and the efficiency of the transformer.

Answer 1