A 120-KVA, 6.000/400-V, Y/Y 3-ph, 50-Hz transformer has an iron loss of 1,600 W.The maximum efficiency occurs at 3/4 full load. Find: (i) The efficiency of Full-loadand 0.8 power factor. (ii) The efficiency of half-load and unity power factor.(iii) The maximum efficiency.

Answered: Image /qna-images/answer/940b2f73-6c0e-4d8d-8eba-834d8006365b.jpg

of Full-load A 120-kVA, 6,000/400-V, Y/Y 3-ph, 50-Hz transformer has an iron loss of 1,600 W. The maximum efficiency occurs at 3/4 full load. Find: (i) The efficiency and 0.8 power factor. (ii) The efficiency of half-load and unity power factor. (iii) The maximum efficiency.

of Full-load A 120-kVA, 6,000/400-V, Y/Y 3-ph, 50-Hz transformer has an iron loss of 1,600 W. The maximum efficiency occurs at 3/4 full load. Find: (i) The efficiency and 0.8 power factor. (ii) The efficiency of half-load and unity power factor. (iii) The maximum efficiency.

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...

See similar textbooks

Similar questions

Some power devices have bidirectional current capability Select one: O a. True b. False The voltage regulation of the transformer will depend on the load Select one: O a. For mainly inductive or resistive load, the voltage regulation is negative O b. For mainly capacitive, inductive or resistive load, the regulation is positive Oc. For mainly capacitive load, voltage regulation is positive and other loads it is negative. O d. For mainly capacitive load, voltage regulation is negative.
Derive the mutual-inductance of 2-winding IT in terms of the physical parameters of the transformer.
A 250kVA, single phase transformer is designed to have a resistance of 1.5% and maximum efficiency occurs when the load is 160kW at 0.8 power factor. Find the efficiency when supplying full-load at 0.8 power factor lagging.
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? 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 cantilever…
6- A 600 kVA, 1-ph transformer has an efficiency of 92 % both at full- load and half-load at unity power factor. Determine its efficiency at 60 % of full load at 0.8 power factor lag.
30-kVA, 2200/220-V, 50-Hz distribution transformer is tested for efficiencyand regulation as follows :O.C. test( Low voltage side ) : 220 V 4.2 A, 148 W S.C. test ( Low voltage side ) : 86 V 10.5 A, 360 W 1-The working current and resistance component of no-load are.........amper , .........ohm * 2-Efficiency at full-load and half the full-load at 0.8 p.f. lagging current. * 3-Equivalent resistance referred to primary & referred to secondary..........ohm , ..........ohm * 4-Regulation of transformer at 0.5 p.f. lagging current * 5-Equivalent reactance referred to primary & referred to secondary..........ohm , ..........ohm * 6-The magnetizing current and reactance component of no-load are.........amper , .........ohm *
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?
In the ideal Transformer given below find the power absorbed by the load. Primary and secondary turns of Transformer are 500 and 1000 respectively. A. + 10V 00000 00000 10Ω
Example 5 A 600 kVA transformer has a primary winding resistance of 0.62 and a secondary winding resistance of 0.002 2. The iron loss is 2.6 kW and the primary and secondary voltages are 6 kV and 330 V respectively. If the power factor of the load is 0.8, determine the efficiency of the transformer (i) on full load, and (ii) on half R.. load.