Answered: A two-winding transformer rated at 100…

A two-winding transformer rated at 100 kVA, is connected as an autotransformer to provide 10kV from a 15kV supply. Calculate the new rated kVA output.

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 3.57P: A two-winding single-phase transformer rated 60kVA,240/1200V,60Hz, has an efficiency of 0.96 when...

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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

A two-winding transformer rated at 100 kVA, is connected as an autotransformer to provide 10kV from a 15kV supply. Calculate the new rated kVA output.

consider the power transformer mode and calculate the related currents

Where,

Vp = 10000V
Ip = S/(√3Vp)

Is = S/(√3Vs)

When find the new currents and voltages proceed to find the primary and secondary powers of the autotransformer. And conclude the rating of the autotransformer.

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