Problem 1A 15 KVA, 2200/220 V transformer has R. = 195 Q and Xm = 170 2 referred to the LV side. Reqand Xeq referred to the HV side are 6 N and 10 N, respectively. The transformer is supplying a loadof 10 kVA on the LV side at 0.96 PF lagging at 215 V. Find voltage regulation and efficiency.Problem 2A single-phase 25 kVA, 2200/220 V, 50 Hz transformer has core loss P₁ = 140 W and copper lossP. = 100 W at half-rated current. Find efficiency when the transformer delivers load at full-ratedcurrent at 0.8 PF lagging.

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A single-phase 25 kVA, 2200/220 V, 50 Hz transformer has core loss Pi = 140 W and copper loss P. = 100 W at half-rated current. Find efficiency when the transformer delivers load at full-rated current at 0.8 PF lagging.

A single-phase 25 kVA, 2200/220 V, 50 Hz transformer has core loss Pi = 140 W and copper loss P. = 100 W at half-rated current. Find efficiency when the transformer delivers load at full-rated current at 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 3.9P

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Concept explainers

Three-Phase Transformers

Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.

Transformer

Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.

Question

Problem 1
A 15 KVA, 2200/220 V transformer has R. = 195 Q and Xm = 170 2 referred to the LV side. Req
and Xeq referred to the HV side are 6 N and 10 N, respectively. The transformer is supplying a load
of 10 kVA on the LV side at 0.96 PF lagging at 215 V. Find voltage regulation and efficiency.
Problem 2
A single-phase 25 kVA, 2200/220 V, 50 Hz transformer has core loss P₁ = 140 W and copper loss
P. = 100 W at half-rated current. Find efficiency when the transformer delivers load at full-rated
current at 0.8 PF lagging.

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