A single-phase transformer, with primary turns of 500, is delivering full-load of 80 kW at a lagging power factor of 0.8 from a 220 V, 50 Hz supply. The current delivered to the load is 227 A. iv. Determine the current drawn from the supply. v. Assume the core and copper losses are 800 W and 3200 W respectively. Detemine the input power and efficiency of the transformer.

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 3.9P

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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 single-phase transformer, with primary turns of 500, is delivering full-load of 80 kW at
a lagging power factor of 0.8 from a 220 V, 50 Hz supply. The current delivered to the
load is 227 A.
iv. Determine the current drawn from the supply.
v. Assume the core and copper losses are 800 W and 3200 W respectively. Detemine the
input power and efficiency of the transformer.
vi. If the load impedance on the transformer is doubled, what will be effect on the core
and copper losses? What is the efficiency at this operating condition?

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