The ratings of a three-phase, three-winding transformer
Chapter , Problem 3.53(choose chapter or problem)
The ratings of a three-phase, three-winding transformer are: Primary: Y connected, 66 kV, 15 MVA Secondary: Y connected, 13.2 kV, 10 MVA Tertiary: D connected, 2.3 kV, 5 MVA Neglecting resistances and exciting current, the leakage reactances are: XPS =0:07 per unit on a 15-MVA; 66-kV base XPT = 0:09 per unit on a 15-MVA; 66-kV base XST = 0:08 per unit on a 10-MVA; 13:2-kV base Determine the per-unit reactances of the per-phase equivalent circuit using a base of 15 MVA and 66 kV for the primary.
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