How does change in frequency affect the operation of a given transformer?Ans. 1. Iron loss........ increases with a decrease in frequency. A 60-Hz transformer will have nearly11% higher losses when worked on 50Hz instead of 60 Hz. However, when a 25-Hz trans-former is worked on 60 Hz, iron losses are reduced by 25%.2. Cu loss..........in distribution transformers, it is independent of frequecy.3. Efficiency...........since Cu loss is unaffected by change in frequency, a given transformer effi-ciency is less at a lower frequency than at a higher one.4.Regulation........regulation at unity power factor is not affected because IR drop is independentof frequency. Since reactive drop is affected, regulation at low power factors decreases witha decrease in frequency and vice-versa. For example, the regulation of a 25-Hz transformerwhen operated at 50-Hz and low power factor is much poorer.5. Heating..........since total loss is greater at a lower frequency, the temperature is increased withdecrease in frequency.111

Answered: How does change in frequency affect the…

How does change in frequency affect the operation of a given transformer? with a decrease in frequency. A 60-Hz transformer will have when a 25-H

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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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

How does change in frequency affect the operation of a given transformer?
Ans. 1. Iron loss........ increases with a decrease in frequency. A 60-Hz transformer will have nearly
11% higher losses when worked on 50Hz instead of 60 Hz. However, when a 25-Hz trans-
former is worked on 60 Hz, iron losses are reduced by 25%.
2. Cu loss..........in distribution transformers, it is independent of frequecy.
3. Efficiency...........since Cu loss is unaffected by change in frequency, a given transformer effi-
ciency is less at a lower frequency than at a higher one.
4.
Regulation........regulation at unity power factor is not affected because IR drop is independent
of frequency. Since reactive drop is affected, regulation at low power factors decreases with
a decrease in frequency and vice-versa. For example, the regulation of a 25-Hz transformer
when operated at 50-Hz and low power factor is much poorer.
5. Heating..........since total loss is greater at a lower frequency, the temperature is increased with
decrease in frequency.
111

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