Practice Problem 1,2 A 60 - cycle, 150 kVA, three winding transformer is rated at 4,800 volts primary voltage, and there are two secondary windings, one rated at 720 Volts and the other at 240 Volts. There are 360 primary turns. The rating of each secondary winding is 75 kVA. Determine (a) turns in each secondary winding: (b) rated primary current at unity power factor; (c) rated primary current at 0.707 power factor lagging current; (d) rated current of the 600-Volt and 240-Volt secondaries at unity power factor. Answers: (c) I, = 31.25/-45" Amp. 104.167 /Q" Amp.; (a) NSI = 54 turnsi N = 18 turns (b) I, 31.25/0" Amp. (d) 312.5/0" Amp. %3!
Practice Problem 1,2 A 60 - cycle, 150 kVA, three winding transformer is rated at 4,800 volts primary voltage, and there are two secondary windings, one rated at 720 Volts and the other at 240 Volts. There are 360 primary turns. The rating of each secondary winding is 75 kVA. Determine (a) turns in each secondary winding: (b) rated primary current at unity power factor; (c) rated primary current at 0.707 power factor lagging current; (d) rated current of the 600-Volt and 240-Volt secondaries at unity power factor. Answers: (c) I, = 31.25/-45" Amp. 104.167 /Q" Amp.; (a) NSI = 54 turnsi N = 18 turns (b) I, 31.25/0" Amp. (d) 312.5/0" Amp. %3!
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:Practice Problem 1.2
A 60 - cycle, 150 kVA, three winding transformer is rated at 4,800 volts primary voltage, and
there are two secondary windings, one rated at 720 Volts and the other at 240 Volts. There are
360 primary turns. The rating of each secondary winding is 75 kVA. Determine (a) turns in each
secondary winding; (b) rated primary current at unity power factor; (c) rated primary current at
0.707 power factor lagging current; (d) rated current of the 600-Volt and 240-Volt secondaries
at unity power factor.
Answers:
(a) N. = 54 turnsi N2
= 18 turns
(c)
I, = 31.25/- 45" Amp.
SI
(b) I,
31.25/0" Amp.
(d)
= 104.167/0" Amp.i I
312.5/0" Amp.
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