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  1. For the power system shown in the figure below, specifications of the components are following:
    G1: 25 kV, 100 MVA, X = 9%
    G2: 25 kV, 100 MVA, X = 9%
    T1: 25 kV/ 220 kV, 90 MVA X = 12%
    T2: 25 kV/25 kV, 90 MVA, X = 12%
    Line 1: 220 kV, X = 150 ohms

    Choose 25 kV as the base voltage at the generator G1, and 200 MVA as the MVA base. The impedance diagram is
Correct Option: B


Base voltage = 25kV,
Base MVA = 200 MVA
Generator G1, G2

XG1 = XG2 = 0.9 ×
200
.
25
² = j0.18
10025

Xr1 = 0.12 ×
200
.
25
² = j0.27
9025

For line 1, VL = 220 kV
∴ XLine = 150 *
220
= 0.62
(220)²



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