1. A 10 kVA, single-phase, 2400-V:120-V, 60 Hz transformer has an equivalent impedance referred toLV side of 0.01 + j0.09 Q. This transformer has a core loss of 100 W at rated voltage. When ratedcurrent is applied to the 2400-V winding, the exciting current in that winding is found to be 0.2 A.a. Find the full-load regulation of this transformer at a power factor of 0.8 lagging.b. Find the efficiency of this transformer at full load, 0.8 power factor lagging.c. If standard open-circuit and tests were performed on this transformer, what would be the measuredvalues of these tests?2. The following data were obtained on a 2.5 MVA, 50-Hz, 19.1-kV:3.81-kV single-phase transformertested at 50 Hz:Voltage (V) Current (A) Power (kW)LV winding with HV terminals open-circuited:38109.868.14HV winding with LV terminals short-circuited:92014110.3a. Calculate the cantilever equivalent-circuit parameters as referred to the transformer high-voltagewinding.b. Calculate the cantilever equivalent-circuit parameters as referred to the transformer low-voltagewinding.c. With the transformer carrying rated load and rated voltage at its low-voltage terminal, calculate thepower dissipated in the transformer.d. Repeat part a and b in per-unit. Compare and comment on your result.3. A three-phase Y-Y transformer is rated at 25 MVA, 13.8-kV:69-kV and has a single-phaseequivalent series impedance 62 + j388 m2 referred to the low-voltage winding.a. A three-phase short circuit is applied to the low-voltage winding. Calculate the voltage applied to thehigh-voltage winding which will result in rated current into the short circuit.b. The short circuit is removed and a three-phase load is connected to the low-voltage winding. Withrated voltage applied to the high-voltage winding, the input power to the transformer is observed tobe 18 MW at 0.75 power-factor lagging. Calculate the line-line terminal voltage at the load.4. A 45-kVA, 120-V:280-V single-phase transformer is to be connected as a 280-V:400-Vautotransformer. Determine the voltage ratings of the high- and low-voltage windings for thisconnection and the kVA rating of the autotransformer connection.

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1. A 10 kVA, single-phase, 2400-V:120-V, 60 Hz transformer has an equivalent impedance referred to LV side of 0.01 + j0.09 Q. This transformer has a core loss of 100 W at rated voltage. When rated current is applied to the 2400-V winding, the exciting current in that winding is found to be 0.2 A. a. Find the full-load regulation of this transformer at a power factor of 0.8 lagging. b. Find the efficiency of this transformer at full load, 0.8 power factor lagging. c. If standard open-circuit and tests were performed on this transformer, what would be the measured values of these tests?

1. A 10 kVA, single-phase, 2400-V:120-V, 60 Hz transformer has an equivalent impedance referred to LV side of 0.01 + j0.09 Q. This transformer has a core loss of 100 W at rated voltage. When rated current is applied to the 2400-V winding, the exciting current in that winding is found to be 0.2 A. a. Find the full-load regulation of this transformer at a power factor of 0.8 lagging. b. Find the efficiency of this transformer at full load, 0.8 power factor lagging. c. If standard open-circuit and tests were performed on this transformer, what would be the measured values of these tests?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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