A 250kVA, single phase transformer is designed to have a resistance of 1.5% and maximum efficiency occurs when the load is_160kW at 0.8 power factor. Find the efficiency when supplying full-load at 0.8 power factor lagging.

A 250kVA, single phase transformer is designed to have a resistance of 1.5% and maximum efficiency occurs when the load is_160kW at 0.8 power factor. Find the efficiency when supplying full-load at 0.8 power factor 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 3.15P: Rework Problem 3.14 if the transformer is delivering rated load at rated secondary voltage and at...

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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

A 250kVA, single phase transformer is designed to have a resistance of 1.5% and
maximum efficiency occurs when the load is 160kW at 0.8 power factor. Find the
efficiency when supplying full-load at 0.8 power factor lagging.

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