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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F16c85ffe-a455-4cb4-bf31-6a7a3018251b%2Fcd12b4c3-4c15-4acb-a553-f3db38db1119%2F5smo00b_processed.png&w=3840&q=75)
Transcribed Image Text: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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