A 5 KVA, 2300/230 V, 50 Hz transformer was tested for iron losses with normal excitation and copper losses at full load and these were found to be 40 W and 112 W respectively. Calculate the efficiency of this transformer at 0.8 p.f. for the following KVA outputs 1.25, 3.75 & 75

A 5 KVA, 2300/230 V, 50 Hz transformer was tested for iron losses with normal excitation and copper losses at full load and these were found to be 40 W and 112 W respectively. Calculate the efficiency of this transformer at 0.8 p.f. for the following KVA outputs 1.25, 3.75 & 75

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 3.57P: A two-winding single-phase transformer rated 60kVA,240/1200V,60Hz, has an efficiency of 0.96 when...

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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 5 KVA, 2300/230 V, 50 Hz transformer was tested for iron losses
with normal excitation and copper losses at full load and these were
found to be 40 W and 112 W respectively. Calculate the efficiency of
this transformer at 0.8 p.f. for the following KVA outputs 1.25, 3.75 &
7.5

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