The distribution network shown in Figure below is to supply two factories A & B with load curves indicated in Fig. Assume that both factories have lagging power factor of 0.8. a) Select the required sizes of transformers for substation supplying both factories such that in the case of a failure in one transformer the overload on the remaining ones should not exceed 12% . b)Calculate the annual energy losses in the transformers. Assuming that transformers are in operation continuously c) Select the reauired sizes of fuses to be installed at both sides of

The distribution network shown in Figure below is to supply two factories A & B with load curves indicated in Fig. Assume that both factories have lagging power factor of 0.8. a) Select the required sizes of transformers for substation supplying both factories such that in the case of a failure in one transformer the overload on the remaining ones should not exceed 12% . b)Calculate the annual energy losses in the transformers. Assuming that transformers are in operation continuously c) Select the reauired sizes of fuses to be installed at both sides of

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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A load of 1600 kW at 0-8 p.f. is shared by two 1000 kVA transformers having equal turn ratios and connected in parallel on their primary and secondary side. The full load resistance drop is 1% and reactive drop is 6% in one of the transformers, the corresponding values in the other transformer being 1.5% and 5%. Calculate the power and power factor at which each transformer is operating.
the subject is : Transformers
8. The two winding transformer and the autotransformer of the circuit shown in Figure are ideal. Determine the conducting and transformed currents of auto transformer. N1=200 NBC=20 N2=100 NBA=30 10A B 200 V 50,Hz C N1: N2
Two transformersA and B are connected in parallel to a load of (2+j1.5) ohm.Their impedances in Secondary terms ZA = (0.15+j0.8) ohm and Zb = (0.1+j30.6)ohm Their no-load termind voltages are EA=200<0 V and EB=210<0 Volt.Find the power and Power factor of each transformer? %3D %3D
A short-circuit test has been carried out with a three-phase transformer of 30/6.5 kV. By experiment, the high-voltage side was short-circuited and it was read: Ik=30A, Uk=234V and Pk=5.24kW a) Find the nominal voltage drop in % for this transformer where a was measured power factor of 0.8 ind.Under a certain load of the transformer, we measure a voltage drop of 5%, when the primary side is at 30kV. b) Find the secondary clamping voltage at this particular load
Q3: At the parallel operation of three-phase transformers: a) Give an explanation for the following cases: i. Two-lamps are glow-up ii. Three-lamps are glow-up b) Two three-phase 11kV/ 380 V transformers are connected in parallel to serve a load of 36 kVA at unity power factor. The secondary side current for one transformer is 14.1 A, determine the load sharing for each transformer and the current of the other transformer.
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.