300 kVA, A 13,800/480-V three-phase Y- A-connected transformer bank. It is supplied with power directly from a large con

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300 kVA, A 13,800/480-V three-phase Y- A-connected transformer bank. It is supplied with
power directly from a large constant-voltage bus. In the short-circuit test, the recorded values on the high voltage side for one of these transformers are: Vsc-560V, Isc= 12.6 A, Psc = 3300W.
a) If this transformer bank delivers a rated load at 0.85 PF lagging and rated voltage, what is the
line-to-line voltage on the high-voltage side of the transformer bank?
b) What is the voltage regulation under these conditions?