A transformer of 500kW output with unity power factor is required to operate for 8 hours at 25% load, 7 hours at full load and no-load for the rest of the day. Calculate their all-day efficiency and decide which of the two transformers be chosen if the full load losses in them as follows: Transformer A: Iron loss 1% and copper loss 2.5%. Transformer B: Iron loss 1.5% and copper loss 1.5%, **** addr16

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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A transformer of 500kW output with unity power factor is required to operate for 8 hours at 25%
load, 7 hours at full load and no-load for the rest of the day. Calculate their all-day efficiency and
decide which of the two transformers be chosen if the full load losses in them as follows:
Transformer A: Iron loss 1% and copper loss 2.5%.
Transformer B: Iron loss 1.5% and copper loss 1.5%,
Transcribed Image Text:A transformer of 500kW output with unity power factor is required to operate for 8 hours at 25% load, 7 hours at full load and no-load for the rest of the day. Calculate their all-day efficiency and decide which of the two transformers be chosen if the full load losses in them as follows: Transformer A: Iron loss 1% and copper loss 2.5%. Transformer B: Iron loss 1.5% and copper loss 1.5%,
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