transformer has its maximum efficiency of 98% at 20kVA and unity power factor. During the day, it is loaded as under: 12 hours: 3kW at power factor 0.5 lagging. 6 nours: 11kW at power factor 0.8 lagging. 6 hours 48kWat power factor 0.9 lagging. Find the all-day efficiency.
transformer has its maximum efficiency of 98% at 20kVA and unity power factor. During the day, it is loaded as under: 12 hours: 3kW at power factor 0.5 lagging. 6 nours: 11kW at power factor 0.8 lagging. 6 hours 48kWat power factor 0.9 lagging. Find the all-day efficiency.
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 3.63P: A 23/230-kV step-up transformer feeds a three-phase transmission line, which in turn supplies a...
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![transformer has its maximum efficiency of 98% at 20kVA and unity power factor. During the day, it
is loaded as under:
12 hours: 3kW at power factor 0.5 lagging.
6 nours: 11kW at power factor 0.8 lagging.
6 hours 48kWat power factor 0.9 lagging.
Find the all-day efficiency.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3b30af00-f11b-4ad6-b2ae-f7f82d885b73%2F8cbb52df-f0c3-433b-99e2-a9259c3e02a9%2Fs1ipeuj_processed.jpeg&w=3840&q=75)
Transcribed Image Text:transformer has its maximum efficiency of 98% at 20kVA and unity power factor. During the day, it
is loaded as under:
12 hours: 3kW at power factor 0.5 lagging.
6 nours: 11kW at power factor 0.8 lagging.
6 hours 48kWat power factor 0.9 lagging.
Find the all-day efficiency.
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