Electrical machine

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Electrical machine transformer question. please show steps. 

A 20-kVA 8000/277-V distribution transformer has the following resistances and reactance:
Rp = 32 2
Rs = 0.05 2
Xs = 0.06 2
XM = 30 k2
Xp = 45 2
Rc = 250 k2
The excitation branch impedances are given referred to the high-voltage side of the transformer.
Find the equivalent circuit of this transformer referred to the high-voltage side.
Assume that this transformer is supplying rated load at 277 V and 0.8 PF lagging. Calculate
(i)
(ii)
(a)
(b)
Transformer's input voltage
Transformer's voltage regulation
What is the transformer's efficiency under the conditions of part (b)?
Transcribed Image Text:A 20-kVA 8000/277-V distribution transformer has the following resistances and reactance: Rp = 32 2 Rs = 0.05 2 Xs = 0.06 2 XM = 30 k2 Xp = 45 2 Rc = 250 k2 The excitation branch impedances are given referred to the high-voltage side of the transformer. Find the equivalent circuit of this transformer referred to the high-voltage side. Assume that this transformer is supplying rated load at 277 V and 0.8 PF lagging. Calculate (i) (ii) (a) (b) Transformer's input voltage Transformer's voltage regulation What is the transformer's efficiency under the conditions of part (b)?
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