A 20-kVA 8000/277-V distribution transformer has the following resistances and reactances: R, -32Q X, -45 Ω R, -0.05 X, -0.062 R-250 k The excitation branch impedances are given referred to the high-voltage side of the transformer. (a) Find the equivalent circuit of this transformer referred to the high-voltage side. X - 30 k (b) Assume that this transformer is supplying rated load at 277 V and 0.8 PF lagging. What is this transformer's input voltage? What is its voltage regulation? (e) What is the transformer's efficiency under the conditions of part (c)?
A 20-kVA 8000/277-V distribution transformer has the following resistances and reactances: R, -32Q X, -45 Ω R, -0.05 X, -0.062 R-250 k The excitation branch impedances are given referred to the high-voltage side of the transformer. (a) Find the equivalent circuit of this transformer referred to the high-voltage side. X - 30 k (b) Assume that this transformer is supplying rated load at 277 V and 0.8 PF lagging. What is this transformer's input voltage? What is its voltage regulation? (e) What is the transformer's efficiency under the conditions of part (c)?
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Transcribed Image Text:3. A 20-kVA 8000/277-V distribution transformer has the following resistances and reactances:
R, -3202
R₁ -0.052
X-45
Ω
X, -0.06 2
R. - 250 k
X - 30 k
The excitation branch impedances are given referred to the
high-voltage side of the transformer.
(a) Find the equivalent circuit of this transformer referred to
the high-voltage side.
(b) Assume that this transformer is supplying rated load at
277 V and 0.8 PF lagging. What is this transformer's input
voltage? What is its voltage regulation?
(c) What is the transformer's efficiency under the conditions
of part (c)?
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