A two-winding transformer is rated at 60-kVA, 240/1200-V, 60-Hz. When operated as a conventional two-winding transformer at rated load, 0.8 power factor, its efficiency is 0.96. This transformer is to be used as a 1440/1200-V step-down autotransformer in a power distribution system. (a) Calculate the primary currents I₁ and I2, and the secondary current I of the autotransformer. (b) Assuming that the transformer is ideal, find the transformer kVA rating when used as an autotransformer. (c) Find the total transformer loss and the efficiency with the kVA loading of part (a) and 0.8 power factor.
A two-winding transformer is rated at 60-kVA, 240/1200-V, 60-Hz. When operated as a conventional two-winding transformer at rated load, 0.8 power factor, its efficiency is 0.96. This transformer is to be used as a 1440/1200-V step-down autotransformer in a power distribution system. (a) Calculate the primary currents I₁ and I2, and the secondary current I of the autotransformer. (b) Assuming that the transformer is ideal, find the transformer kVA rating when used as an autotransformer. (c) Find the total transformer loss and the efficiency with the kVA loading of part (a) and 0.8 power factor.
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 3.57P: A two-winding single-phase transformer rated 60kVA,240/1200V,60Hz, has an efficiency of 0.96 when...
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