2. An 12,500/440 V, 250 kVA, single-phase, 60 Hz transformer has core loss of 2.2 kW and Cu loss of 1.8 kW. Determine the maximum efficiency at 0.8 p.f. lagging. 3. Find the all-day efficiency of 600 kVA distribution transformer whose Cu loss and

2. An 12,500/440 V, 250 kVA, single-phase, 60 Hz transformer has core loss of 2.2 kW and Cu loss of 1.8 kW. Determine the maximum efficiency at 0.8 p.f. lagging. 3. Find the all-day efficiency of 600 kVA distribution transformer whose Cu loss and

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 3.31MCQ

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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

2. An 12,500/440 V, 250 kVA, single-phase, 60 Hz transformer has core loss of 2.2 kW
and Cu loss of 1.8 kW. Determine the maximum efficiency at 0.8 p.f. lagging.
3. Find the all-day efficiency of 600 kVA distribution transformer whose Cu loss and
iron loss at full-load is 5.5 kW and 4.5 kW, respectively. During a day of 24 hours, it is
loaded under:
No. of Hours
8
6
10
Loading in kW
550
400
450
Power Factor
0.8
0.70
0.8

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