How do I calculate tranformers actual impedance ?

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louie

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I have a 3 phase transformer and I want to calculate the resistance and reactance per phase on the low voltage side with the following information.

14.4 kV / 540 V (wye-delta)
2.2 MVA
0.6% R + 6% X (6%reactance and 0.6%resistace)

Thanks in advance
 
Re: How do I calculate tranformers actual impedance ?

Louie
The transformer should have a name plate with the %Z. normally we are not concerned with the %R and %x. To get the %R the lituratue on the transformer may give you the watts copper loss. if so you can caculate the R of the coil.
from there you can caculate %X
 
Re: How do I calculate tranformers actual impedance ?

To convert from percent to ohms use the following equation. You can substitute R&X for Z if you have wish.


Z ohms = 10x(kv**2)x(%Z)/(KVA)

Jim T
 
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