3. With the instruments located on the high-voltage side short- circuited, the short-circuit test readings for the 50KVA, 2400:240V transformer are 48V, 20.8A, and 617W. An open-circuit test with the low-voltage side energized gives instrument readings on the side energized gives instrument readings on the side of 240V, 5.41A, and 186W. The transformer is connected as an autotransformer as shown in Figurel, in which c-a is the 240V winding and a- b is the 2400V winding. It is assumed that the 240V winding has enough insulation to a voltage of 2640V to ground. (a) Compute the voltage rating V, of the high side for this autotransformer connection. (b) Compute the kVA as an autotransformer. (c) Compute the full-load efficiency as an autotransformer operating with the rated load of 0.8 power factor lagging. I, - Is %3D Vs= 240V Vp V, Ik- Ip 2400V

3. With the instruments located on the high-voltage side short- circuited, the short-circuit test readings for the 50KVA, 2400:240V transformer are 48V, 20.8A, and 617W. An open-circuit test with the low-voltage side energized gives instrument readings on the side energized gives instrument readings on the side of 240V, 5.41A, and 186W. The transformer is connected as an autotransformer as shown in Figurel, in which c-a is the 240V winding and a- b is the 2400V winding. It is assumed that the 240V winding has enough insulation to a voltage of 2640V to ground. (a) Compute the voltage rating V, of the high side for this autotransformer connection. (b) Compute the kVA as an autotransformer. (c) Compute the full-load efficiency as an autotransformer operating with the rated load of 0.8 power factor lagging. I, - Is %3D Vs= 240V Vp V, Ik- Ip 2400V

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

Chapter6: Power Flows

Section: Chapter Questions

Problem 6.61P

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