A Y connected bank of three identical 100 kVA, 2400 V 120 V, 60 Hz transformers is supplied with power through a feeder whose impedance is 0 065 j0 87 per phase The voltage at the sending end of the feeder is held constant at 2400 V line to line The results of a single phase short circuit test on o...

First calculate the series impedance ZeqH ReqHjXeqH of the trans former from the shortcircuit te ...

A -Y-connected bank of three identical 100-kVA, 2400-V: 120-V, 60-Hz transformers is supplied with power through a

Question:

A ∆-Y-connected bank of three identical 100-kVA, 2400-V: 120-V, 60-Hz transformers is supplied with power through a feeder whose impedance is 0.065 + j0.87 Ω per phase. The voltage at the sending end of the feeder is held constant at 2400 V line-to-line. The results of a single-phase short-circuit test on one of the transformers with its low-voltage terminals short-circuited are VH = 53.4V f = 60Hz IH = 41.7A P = 832W

a. Determine the line-to-line voltage on the low-voltage side of the transformer when the bank delivers rated current to a balanced three-phase unity power factor load.

b. Compute the currents in the transformer's high- and low-voltage windings and in the feeder wires if a solid three-phase short circuit occurs at the secondary line terminals.