Question 1 An ideal two winding transformer with a rectangular oross-sectional area of 60cm by 20cm and transformation ratio 0.02 draws a magnetising current of 1.6A when the angle of displacement is 53.13°. It is realised that when the terminal voltage is 220V, at 50HZ, a load current of 200A at 0.8p.f. lagging fows in the secondary. Assuming 400 tums in the transformer secondary windings, a calculate current drawn from the primary

Question 1 An ideal two winding transformer with a rectangular oross-sectional area of 60cm by 20cm and transformation ratio 0.02 draws a magnetising current of 1.6A when the angle of displacement is 53.13°. It is realised that when the terminal voltage is 220V, at 50HZ, a load current of 200A at 0.8p.f. lagging fows in the secondary. Assuming 400 tums in the transformer secondary windings, a calculate current drawn from the primary

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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QUESTIONS: 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. Ifstandard open-circuit and tests were performed on this transformer, what would be the measured values of these tests? 2. The following data were obtained on a 2.5 MVA, 50-Hz, 19.1-kV:3.81-kV single-phase transformer tested at 50 Hz: Voltage (V) Current (A) Power (kW) LV winding with HV terminals open-circuited: 3810 9.86 8.14 HV winding with LV terminals short-circuited: 920 141 10.3 a. Calculate the cantilever equivalent-circuit parameters as referred to the transformer high-voltage winding. b. Calculate the…
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