1 A 2,400/2,200 V autotransformer delivers a load of 90.5 kW at a power factor of 0.75. Calculate the current in each winding section and the kVA rating of the transformer. 2 Two transformers connected in open delta supply a 400-kw balanced load operating at 0.866 p.f. (lag). The load voltage is 440 V. What is (a) the kVA supplied by each transformer? (b) the kW supplied by each transformer? 3 In a short circuit test on a circuit breaker, the following readings were obtained on single frequency transient : a. time to reach the peak re-striking voltage = 50 μsec b. the peak re-striking voltage = 100 kV Determine the average RRRV and frequency of oscillations
1 A 2,400/2,200 V autotransformer delivers a load of 90.5 kW at a power factor of 0.75. Calculate the current in each winding section and the kVA rating of the transformer. 2 Two transformers connected in open delta supply a 400-kw balanced load operating at 0.866 p.f. (lag). The load voltage is 440 V. What is (a) the kVA supplied by each transformer? (b) the kW supplied by each transformer? 3 In a short circuit test on a circuit breaker, the following readings were obtained on single frequency transient : a. time to reach the peak re-striking voltage = 50 μsec b. the peak re-striking voltage = 100 kV Determine the average RRRV and frequency of oscillations
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 3.55P: A single-phase l0-kVA,2300/230-volt,60-Hz two-winding distribution transformer is connected as an...
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