Q1-A 3-phase step down transformer 1200 KVA , 11000/2200 V, 50 Hz .The resistance /phase and leakage reactance/phase of the primary winding are 1.2Q and 4.8Q and the corresponding values for the...

Q1-A 3-phase step down transformer 1200 KVA , 11000/2200 V, 50 Hz .The resistance /phase and leakage reactance/phase of the primary winding are 1.2Q and 4.8Q and the corresponding values for the secondary winding are 0.01Q and 0.06Q respectively if the primary winding is connected in delta and secondary in star. calculate: 1)The voltage to be applied at normal frequency to the primary to circulate full-load current through it when the secondary is short-circuited ii) The full load copper loss Q2- A 3-phase 250KVA, 11000/416 transformer is delta-connected on the primary and star connected on the secondary. The primary resistance / phase is 8 Q and secondary resistance/phase is 0.0034 Q. determine the efficiency on full-load at 0.8 power factor lagging if the iron loss is 660 W


Extracted text: Q1-A 3-phase step down transformer 1200 KVA , 11000/2200 V, 50 Hz .The resistance /phase and leakage reactance/phase of the primary winding are 1.22 and 4.82 and the corresponding values for the secondary winding are 0.012 and 0.062 respectively if the primary winding is connected in delta and secondary in star. calculate: i)The voltage to be applied at normal frequency to the primary to circulate full-load current through it when the secondary is short-circuited ii) The full load copper loss Q2- A 3-phase 250KVA, 11000/416 transformer is delta-connected on the primary and star connected on the secondary. The primary resistance / phase is 8 2 and secondary resistance/phase is 0.0034 2. determine the efficiency on full-load at o.8 power factor lagging if the iron loss is 660 W 03