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A 40-kVA transformer has iron loss of 450 W and full-load Copper loss of 850 W. If the power factor of the load is 0.8 lagging. The full-load efficiency of the transformer is:

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.11P: For the transformer in Problem 3.10. The open-circuit test with 11.5 kV applied results in a power...

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Concept explainers

Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.

Question

A 40-kVA transformer has iron loss of 450 W and full-load Copper loss of 850 W. If the
power factor of the load is 0.8 lagging. The full-load efficiency of the transformer is:

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