Maurice Tutor

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Category > Management Posted 27 Feb 2018 My Price 5.00

resistances and reactances

2-2. A 20-kVA 8000/480-V distribution transformer has the following resistances and reactances:

 

Rp = 32 0

 

X p = 45 0

 

Re = 250 k0

 

Rs = 0.05 0

 

Rs = 0.06 0

 

XM = 30 k0

 

 

 

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 480 V and 0.8 PF lag­ ging. 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)?

 

 

2-2. A 20-kVA 8000/480-V distribution transformer has the following resistances and reactances:

 

Rp = 32 0

 

X p = 45 0

 

Re = 250 k0

 

Rs = 0.05 0

 

Rs = 0.06 0

 

XM = 30 k0

 

 

 

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 480 V and 0.8 PF lag­ ging. 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)?

 

 

 

 

 

 

 


 

 

 

 

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Maurice Tutor
(5)
Status NEW Posted 27 Feb 2018 10:02 PM My Price 5.00

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