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HW4Sol

# HW4Sol - EEL 3216 Introduction to Power Systems Homework 4...

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EEL 3216 Introduction to Power Systems Homework # 4 SOLUTIONS 1. A Y-connected bank of three identical 100-kVA, 7967/480 - 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 V SC = 560 V I SC = 12.6 A P SC = 1700 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 7967 V, 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.

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HW4Sol - EEL 3216 Introduction to Power Systems Homework 4...

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