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Unformatted text preview: EEL 3216 Introduction to Power Systems Homework # 4 SOLUTIONS 1. A Yconnected bank of three identical 100kVA, 7967/480 V transformers is supplied with power directly from a large constantvoltage bus. In the shortcircuit test, the recorded values on the highvoltage 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 linetoline 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 noload to fullload. 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 noload to fullload. Repeat this process for power factors of 0.85 lagging, 1.0, and 0.85 leading. lagging, 1....
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This note was uploaded on 02/01/2012 for the course EEL 3216 taught by Professor Brooks during the Spring '08 term at FSU.
 Spring '08
 BROOKS
 Volt

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