Electric Machinery and Power System Fundamentals
1st Edition
ISBN: 9780072291353
Author: Stephen J. Chapman, Stepehn J. Chapman
Publisher: McGraw-Hill Companies, The
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Chapter 2, Problem 2.8P
A 150-MVA, 15/200-kV, single-phase power transformer has a per-unit resistance of 1.2 percent and a per-unit reactance of 5 percent (data taken from the transformer’s nameplate). The magnetizing impedance is j80 per unit.
- Find the equivalent circuit referred to the low-voltage side of this transformer.
- Calculate the voltage regulation of this transformer for a full-load current at power factor of 0.8 lagging.
- Calculate the copper and core losses in the transformer at the conditions in (b).
- Assume that the primary voltage of this transformer is a constant 15 kV, and plot the secondary voltage as a function of load current for currents from no-load to full-load. Repeat this process for power factors of 0.8 lagging, 1.0, and 0.8 leading.
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Chapter 2 Solutions
Electric Machinery and Power System Fundamentals
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