Question

V. The figure showed a balanced Y - A three phase circuits. The phase voltages of the Y - connected source are Va = 1107_0° Vrms, Vo = 1101_-120° Vms, and V. = 1107_120° Vrms. The line impedance are each ZL = 10 + j5 12. The impedance of the A-connected load are each ZA = 75 + j225 1. Determine the phase currents in the A-connected load. ZL] b TAB & A B Zi IGB Zo Voy IV Tech RICA Zu С. Ice

Answer 1

ZL STA 北 JAR V V = 10L-120° Gren Geven Y-connected va 11010 ve IBC 18 cm tal Ice Souages Z=10 tisor Vc -110 H120° 24 = 7548225 Now Current in Iaz v Y-Connected Circuit 110 Loo 10+)5 11.18 12656 110Lo =8.8 - j4.3 Ir 9.79 L-26.56* A we know know that in star Connected Connected System Ic z Iph lazdo zdca IL Ja do zlo = 9.79 1-26.56

Now on delta Connection But ZA = 75+/225 in delta Connection V = Vph 110L = Vph Vi LOLO Now line Current VL 110L0 b. Z 75+j225 0.144-o.nui -0.46L-715 A

Now phare Current Ephe de B r.lt -79 h.on 13 Iph - 0.265 L-71.5A