The iron load of 230/115V, 5KVA transformer is 200W. The copper loss at full load is 250W. Find the efficiency of transformer when delivering i). Full load power at unity power factor i1). Half full load power at 0.8 pf lagging

The iron load of 230/115V, 5KVA transformer is 200W. The copper loss at full load is 250W. Find the efficiency of transformer when delivering i). Full load power at unity power factor i1). Half full load power at 0.8 pf lagging

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 3.32MCQ

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Concept explainers

Maximum power transfer theorem

A resistive load will consume maximum power from a network when the load resistance is equal to the resistance of the network as viewed from the open-circuit terminals, with all energy sources removed leaving only the internal resistances. Physicist Moritz von Jacobi introduced the maximum power transfer theorem in 1940. Therefore, this theorem is also known as Jacobi's law.

Question

The iron load of 230/115V, 5KVA transformer is 200W. The copper loss at full load is 250W. Find the
efficiency of transformer when delivering
i). Full load power at unity power factor
ii). Half full load power at 0.8 pf lagging

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