1. A 150 KVA, 2080/208-V, 3 PHASE, delta-wye transformer with the following: R₁=450mQ R₁=4.5mQ RCH=10 KQ X₁=2.2Q X₁=22mQ X=8 KQ Load-120 KVA, 90KW (lagging power factor) at rated terminal voltage of 208V. Determine: a) The approximate equivalent circuit referred to the low-voltage side b) The primary voltage c) The transformer efficiency

Ql-phase step down transformer 1250 KVA, 10002200 V, 50 Hz The resistance /phase and leakage reactanceiphase of the primary winding are 0.78 2 and 4.82 and the corresponding values for the secondary winding are 0.012 and 0.002 respectively if the primary winding is connected in delta and secondary in star calculate: )The voltage to be applied at normal frequency to the primary to circulate full-load through it when the secondary is short-circuited li) The full load copper loss

A 1,000/200 V transformer takes 0.3 at p.f. of 0.2 on open circuit. Find the magnetising, and iron loss component of no- load primary current.

a single-phase transformer serves a 7.2kw resistive loadlocated 200 ft from the transformer. each conductor from the transformer to load has an impedence of (0.78+j0.052) ohms per 1000ft. if the voltage at the load terminal is 240v, the magnitude of the voltage (v)  at the transformer secondary is most nearly: