2- A 10 kVA, 2500/250 V, single phase transformer gave the following results:V (Volt) I (Amp) Power (Watt) SideO.C. Test 2500.8S.C. Test 6035045L.V.H.V.Find the equivalent circuit parameters referred to LV side?=Ans:- (R'o 1250 S2, X'o=323 2, R02 = 0.05 2, X02 = 0. 1936 2)

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Answered: 2- A 10 kVA, 2500/250 V, single phase…

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 3.28MCQ

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Answer only please The resistance of a transformer winding is 0.25 ohm at 25oC. When operating at full load, the temperature of the winding is 75oC. The temperature coefficient of resistance for copper at 0oC is 0.00427 per oC. What is the winding resistance at full load? a. 0.512 ohm b. 0.315 ohm c. 0.298 ohm d. 0.271 ohm
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1. A 2.4-KVA, 2400/240-V, 50-Hz, the step-down transformer has the following parameters: : RH = 1.59, :XH = 2.50, R₂ = 0.020, X₁ = 0.030, : Rc = 6k2, and: Xm = 8kQ. It is operating at 50% of its load at 0.5 power factor leading. Using the exact equivalent circuit embodying the ideal transformer, determine the efficiency of the transformer. Also, sketch its phasor diagram.
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A 100/S00 V. 1 KVA, 50 Hz transformer was put through open and short-circuit tests to find its internal parameters. The test conditions and derived parameters are as follows Open circut test: The high voltage side terminals were open. The low voltäge side was connected to 10020ª, 50 Hz supply. The low voltage side current was measured as 50245º MA. Short-circuit test The high voltage side terminals were short-circuited. The low voltage side was connected to a variable voltage supply (50 Hz). A full load current of 102-30° A was achieved when the variable voltage supply was at 820° V. The transformer was then put to operation by connecting a load of 400230° 2 to the high voltage side (secondary) while applying a primary voltage of 10020º V. Calculate the primary current (the current drawn from the power supply).

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