3. On what particular occasion do we need to use autotransformer? Below is given the diagram of a conventional transformer. Show the necessary connections required in order to convert it to a step-up autotransformer? Core

3. On what particular occasion do we need to use autotransformer? Below is given the diagram of a conventional transformer. Show the necessary connections required in order to convert it to a step-up autotransformer? Core

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter4: Symbols

Section: Chapter Questions

Problem 7SQ: The symbol shown is a(n) a. iron core transformer. b. auto transformer. c. current transformer. d....

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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

3. On what particular occasion do we need to use autotransformer? Below is given the
diagram of a conventional transformer. Show the necessary connections required in order
to convert it to a step-up autotransformer?
Core

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A two-winding single-phase transformer rated 60kVA,240/1200V,60Hz, has an efficiency of 0.96 when operated at rated load, 0.8 power factor lagging. This transformer is to be utilized as a 1440/1200-V step-down autotransformer in a power distribution system. (a) Find the permissible kVA rating of the autotransformer if the winding currents and voltages are not to exceed the ratings as a two-winding transformer. Assume an ideal transformer. (b) Determine the efficiency of the autotransformer with the kVA loading of part (a) and 0.8 power factor leading.
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