Question

LOAD 90MW 0.8 p.f (lag) ZONEC Te 33kV/130kV SOMVA X=15% ZONE B ZONE D ZONE A (12V) j150 116/122ky SOMVA X-0.12 130kV/11kV 100MVA X=10% 10 BV 100MVA X0.10 10.8V 150MVA X+0.12 1300 Te Td 11kv/132kv 100MVA X-0.15 ZONE E 130kV/11kV SOMVA X 13% Figure 1

Answer 1

(a Taking base of 100 mva and 12 kv (Zone A) .let (1) Voltage Base in zone 'B' VB VA = 11 & Transformer Principle} = - VB 732 I 12 2 = 1 1 2 {\A=12 kr} VB= 132 x 12 VB = 144k v Hence voltage Base in Zone B is 180kv (ii let Voltage Base in zone Eisve VE 132 { VA = 12 kr} VE = 132x12 - 149K. V Hence voltase Base in zone & i8 144 kV cili, Let Voltage Base in zone D is vo VB - 130 VBXll No 130 Vo= 14481 T30 = 12.185kV Honce Voltage Base in zone bis 12.185kr

liv Let Voltage Base in Zonec pe CPR Vc VB - 130 B - 33 Ve= VBx33 Ve 130 23 = 144 x33 130 - 36.55 kr Honce Vollege Base in zone c'i836.55kv Generater Ga and Gb (b) Ga. Xpu now - Xeyald MUA Now, Volg MVA oud kve now so xpunew = 10 x 100 x(1039) ? = .081 pu. Gb Xpu new = 112 x 100 (12.1985) 010628 pu i Fransformer Ta, Tb, Te, Ta, Te Ta Xpu now = "12 x 150 12 -0.2016 Pu

Xpr new = 0 Box 100 (190) = 0.0815 P4 to Xpy now = 15x100 (12) = 0.126pu To xpu now = 0.13x 100 (130) 2 = 0. 212 pu Te Xpu now = 0.15 x 100 (130) - 0.294 pu sine paramets LA, Lb and te. Xpu = X(2). V La xpu= 15 x 100 -00723 P4 i 1 Xpu = 15x1 1942 = 0.0723 Pu Le Xpu= 30x1092 = 0.1446 Pu

(IV) Pouz Upu. Ipu. Cose (36.55 (338) Ipy. 0.8 lo 0.9= 0.9028x0.8 Ipy Ipu = 1.25 pu