Answer to Question #158844 in Electrical Engineering for Kaye

Question

The ratings of the various components of a 3-bus system are listed below:

GENERATOR 1: 50 MVA, 13.8kV, X"= 0.15 p.u. ;

GENERATOR 2: 40 MVA, 13.2kV, X" = 0.20 p.u.

GENERATOR 3: 30 MVA, 11kV, X" = 0.25 p.u.

 TRANSFORMER 1: 45 MVA, 11kV, Delta/110 kV Wye, X=0.1 p.u. ; 

TRANSFORMER 2: 25 MVA, 12.5 kV, Delta /115 kV Wye, X = 0.15 p.u.

TRANSFORMER 3: 40 MVA, 12.5kV, Delta / 115 kV Wye, X = 0.1p.u.

The line impedances are shown in the figure. Draw the reactance diagram based on 50 MVA and 13.8 kV as base quantities in Generator 1. Note: Show a complete solution.

Answer 1

XL1 = j 0.131pu

XL2 = j 0.066 pu

XL3 = j 0.066 pu