A 200-KVA transformer has an efficiency of 98 % at full-load. If the maximum efficiency occurs at three-quarters of full-load, calculate (a) iron loss at full load. (b) Cu loss at full load. (c) efficiency at half- load. Ignore magnetising current and assume a p.f. of 0.8 at all loads.

A 200-KVA transformer has an efficiency of 98 % at full-load. If the maximum efficiency occurs at three-quarters of full-load, calculate (a) iron loss at full load. (b) Cu loss at full load. (c) efficiency at half- load. Ignore magnetising current and assume a p.f. of 0.8 at all loads.

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

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.

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A 200-KVA transformer has an efficiency of 98 % at full-load. If the
maximum efficiency occurs at three-quarters of full-load, calculate (a)
iron loss at full load. (b) Cu loss at full load. (c) efficiency at half-
load. Ignore magnetising current and assume a p.f. of 0.8 at all loads.

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