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Question 1.2: The three-winding single-phase transformer of Figure 1.1 is ...

The three-winding single-phase transformer of Figure 1.1 is rated at 13.8 kV/138 kV/4.157 kV and 50 MVA/40 MVA/10 MVA. Terminations are as follows:

13.8 kV winding: 13.8 kV Source
138 kV winding: 35 MVA load, pf = 0.866 lagging
4.157 kV winding: 5 MVA load, pf = 0.866 leading

Using S_{base} = 10 MVA, and voltage ratings as bases,
(a) Draw the pu equivalent circuit.
(b) Solve for the primary current, power, and power, and power factor.

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