Power System Analysis and Design (MindTap Course List)
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN: 9781305632134
Author: J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher: Cengage Learning
Question

A 100-kVA, 2500/125-V, 50-Hz, step-down transformer has the following parameters: R1= 1.5Ω, X1= 2.8Ω, R2= 15mΩ, X2=20mΩ, Rc1= 3kΩ, Xm1= 5kΩ

The transformer delivers 85% of the rated load at a terminal voltage of 115 V and a power factor of 0.866 lagging. Determine (a) the efficiency, and (b) the voltage regulation.  Draw the phasor diagram of the transformer.

Use the approximate equivalent circuit referred to the secondary side.

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