(c)Q.2(a) (i) Briefly explain TWO major power losses in a power transformer.(ii) Suggest one method to reduce each power losses in Q.2(a)(i).(b) A single-phase transformer, 30 kVA, 1000 V/ 415 V, 50 Hz has the followingtest results:Open-circuit test: 1000 V, 1 A, 800 W (measured at the high voltage side)Short-circuit test: 120 V, 20 A, 1200 W (measured at the high voltage side)(i) By referring all parameters to the high voltage side, calculate the equivalentwinding resistance Reqi, equivalent winding reactance Xeql, the coreinternal resistance, R. and magnetizing reactance, Xm value.(ii) A full load with a 0.9 lagging power factor is connected to the transformer.Calculate the transformer's voltage regulation and efficiency.(iii) Determine the transformer's maximum efficiency when the load is at 0.9power factor lagging.Figure Q.2(c) shows the Y-A configuration of a three-phase power transformer.Give two reasons why this configuration is preferred as a step-up transformer.bFigure Q.2(c)b

Since you have posted the multiple questions with multiple support. so we are supposed to answer 1st…

2 (a) (i) Briefly explain TWO major power losses in a power (ii) Suggest one method to reduce each power losses in Q.2(a)(i). (b) A single-phase transformer, 30 kVA, 1000 V/ 415 V, 50 Hz has the following test results: side)

2 (a) (i) Briefly explain TWO major power losses in a power (ii) Suggest one method to reduce each power losses in Q.2(a)(i). (b) A single-phase transformer, 30 kVA, 1000 V/ 415 V, 50 Hz has the following test results: side)

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

(c)
Q.2
(a) (i) Briefly explain TWO major power losses in a power transformer.
(ii) Suggest one method to reduce each power losses in Q.2(a)(i).
(b) A single-phase transformer, 30 kVA, 1000 V/ 415 V, 50 Hz has the following
test results:
Open-circuit test: 1000 V, 1 A, 800 W (measured at the high voltage side)
Short-circuit test: 120 V, 20 A, 1200 W (measured at the high voltage side)
(i) By referring all parameters to the high voltage side, calculate the equivalent
winding resistance Reqi, equivalent winding reactance Xeql, the core
internal resistance, R. and magnetizing reactance, Xm value.
(ii) A full load with a 0.9 lagging power factor is connected to the transformer.
Calculate the transformer's voltage regulation and efficiency.
(iii) Determine the transformer's maximum efficiency when the load is at 0.9
power factor lagging.
Figure Q.2(c) shows the Y-A configuration of a three-phase power transformer.
Give two reasons why this configuration is preferred as a step-up transformer.
b
Figure Q.2(c)
b

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