Answered: A 2MVA, 3-phase transformer, 33/11-kV,…

A 2MVA, 3-phase transformer, 33/11-kV, Y/Y, has a copper loss of 6 kW. The impedance drop at full-load is 7.5%. Calculate the primary voltage at rated load, 0.8 pf 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 3.32MCQ

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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 2MVA, 3-phase transformer, 33/11-kV, Y/Y, has a copper loss of 6 kW. The impedance drop at full-load is 7.5%. Calculate the primary voltage at rated load, 0.8 pf lagging

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Step 1: Given:

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Step 2: Finding load current and Impedance of the transformer:

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Step 3: Finding Resistance and Reactance of the Transformer:

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Step 4: Finding Primary Voltage:

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