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1.Determine the core loss at 277V, 50HZ is supplied to the primary windings. When at 125V, 60HZ the core loss is 268W and at 75V, 35HZ the core loss is 45W.

1.Determine the core loss at 277V, 50HZ is supplied to the primary windings. When at 125V, 60HZ the core loss is 268W and at 75V, 35HZ the core loss is 45W.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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1.Determine the core loss at 277V, 50HZ is supplied to the primary windings. When at 125V, 60HZ the core loss is 268W and at 75V, 35HZ the core loss is 45W. 2. A 750-kVA, 3-phase, 60HZ transformer has a voltage ratio (line voltages) of 33/11kV and is delta-wye connected. The resistances per phase are: primary side 27N, secondary side 0.5870 and iron loss is 2589W. Calculate the efficiency at full-load and 3/4 of full load respectively (a) at unity p.f. and (b) 0.866 p.f. 3. A load of 265KVA is to be supplied by two parallel transformers connected on both their primary and secondary sides. Technical data of the transformers are as follows: Transf No.1: 150KVA, 13800/240V, %R= 0.89%, %X=4.3% Transf No.2: 225KVA, 13800/240V, %R= 1.12%, %X=4.87. Determine the kVA and currents supplied by each if pf of load is 0.866 lagging.
Transcribed Image Text:1.Determine the core loss at 277V, 50HZ is supplied to the primary windings. When at 125V, 60HZ the core loss is 268W and at 75V, 35HZ the core loss is 45W. 2. A 750-kVA, 3-phase, 60HZ transformer has a voltage ratio (line voltages) of 33/11kV and is delta-wye connected. The resistances per phase are: primary side 27N, secondary side 0.5870 and iron loss is 2589W. Calculate the efficiency at full-load and 3/4 of full load respectively (a) at unity p.f. and (b) 0.866 p.f. 3. A load of 265KVA is to be supplied by two parallel transformers connected on both their primary and secondary sides. Technical data of the transformers are as follows: Transf No.1: 150KVA, 13800/240V, %R= 0.89%, %X=4.3% Transf No.2: 225KVA, 13800/240V, %R= 1.12%, %X=4.87. Determine the kVA and currents supplied by each if pf of load is 0.866 lagging.
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