A Y-connected of three identical 100-kVA 7967/277-V transformers is supplied with power directly from a large...

Transcribed Image Text:

A Y-connected of three identical 100-kVA 7967/277-V transformers 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 = 560 V Isc = 12.6 A Psc = 3300 W (a) If this bank delivers a rated load at 0.88 PF lagging and rated voltage, what is the line-to-line voltage on the primary of the transformer bank? (b) What is the voltage regulation under these conditions? (c) Assume that the primary line voltage of this transformer bank is a constant 13.8 kV, and plot the secondary line voltage as a function of load current for currents from no-load to full-load. Repeat this process for power factors of 0.85 lagging, 1.0, and 0.85 leading. (d) Plot the voltage regulation of this transformer as a function of load current for currents from no-load to full-load. Repeat this process for power factors of 0.85 lagging, 1.0, and 0.85 leading. A Y-connected of three identical 100-kVA 7967/277-V transformers 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 = 560 V Isc = 12.6 A Psc = 3300 W (a) If this bank delivers a rated load at 0.88 PF lagging and rated voltage, what is the line-to-line voltage on the primary of the transformer bank? (b) What is the voltage regulation under these conditions? (c) Assume that the primary line voltage of this transformer bank is a constant 13.8 kV, and plot the secondary line voltage as a function of load current for currents from no-load to full-load. Repeat this process for power factors of 0.85 lagging, 1.0, and 0.85 leading. (d) Plot the voltage regulation of this transformer as a function of load current for currents from no-load to full-load. Repeat this process for power factors of 0.85 lagging, 1.0, and 0.85 leading.

Answer rating: 100% (QA)

The detailed ... View the full answer