A two-winding single-phase transformer rated 60 kVA,
Chapter , Problem 3.57(choose chapter or problem)
A two-winding single-phase transformer rated 60 kVA, 240/1200 V, 60 Hz, has an effciency of 0.96 when operated at rated load, 0.8 power factor lagging. This transformer is to be utilized as a 1440/1200-V step-down autotransformer in a power distribution system. (a) Find the permissible kVA rating of the autotransformer if the winding currents and voltages are not to exceed the ratings as a twowinding transformer. Assume an ideal transformer. (b) Determine the effciency of the autotransformer with the kVA loading of part (a) and 0.8 power factor leading.
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