A 20-kVA, 440/220 V, 1-phase, 50 Hz transformer has iron loss of 324 W. The Cu loss is found to be 100 W when delivering half full-load current. Determine (i) efficiency when delivering full-load current at 0.8 lagging p.f. and (ii) the percent of full-load when the efficiency will be maximum.

A 20-kVA, 440/220 V, 1-phase, 50 Hz transformer has iron loss of 324 W. The Cu loss is found to be 100 W when delivering half full-load current. Determine (i) efficiency when delivering full-load current at 0.8 lagging p.f. and (ii) the percent of full-load when the efficiency will be maximum.

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 3.2P: An ideal transformer with N1=1000andN2=250 is connected with an impedance Z22 across winding 2. If...

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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.

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