Electrical Engineering Name, Surname Group Date: Mark: 1) What are the sources of losses in a transformer

Electrical Engineering Name, Surname Group Date: Mark: 1) What are the sources of losses in a transformer. How to determine them? 2) How to change the rpm of a asynchronous motor? 3) Three-phase circuit (Y connection). Determine the phase and null wire currents. Draw phasor diagram. Vphase 200 V RA RB RC resistor - 8 - XA XB XC inductor inductor capacitor 18 10 -12 4) 7 kVA, 1540/220 V transformer. Short circuit and open circuit results are shown in the table. Determine the parameters for the equivalent transformer model. Open circuit Short circuit Memo No Date 1 03 (a) MO Mo Tu We Th Fr Sa Su ans For Y Connected circuit , phase current is same line current. Also three phase currents 120 apport from each other, are magnitudes: Thase ai II Lal = led = voo 11.12 Xa/ 18 phase bo Vob Iesa IPB 200 1) 21562 √ 8 27 10² 2 ? Bo X² Phese ca vac Ile = loc= tel la = 11.11Lo Ib = 15.62 L-120° Jes 16.67 2+120° 200 122 = 16.67 next page continue 03 (6) Memo No. Date Su Jc K 16.67 12 120 ) ?? I a 120 /15.62 IL