A 20-KVA 8000/277-V distribution transformer has the following resistances and reactances: Rp = 3292 R =...

Transcribed Image Text:

A 20-KVA 8000/277-V distribution transformer has the following resistances and reactances: Rp = 3292 R = 0.0592 Xs = 0.06 2 XM = 30 kn Xp=4592 R = 250 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) Find the per-unit equivalent circuit of this transformer. (c) 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? (d) 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: Rp = 3292 R = 0.0592 Xs = 0.06 2 XM = 30 kn Xp=4592 R = 250 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) Find the per-unit equivalent circuit of this transformer. (c) 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? (d) What is the transformer's efficiency under the conditions of part (c)?

Answer rating: 100% (QA)

The detailed ... View the full answer