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LSK
Participant

Join Date: Jul 2010
Posts: 3

TO FIND %R & %X VALUE

07/20/2010 11:39 AM

Dear all,

I am doing the design of 220kV/66kV 100MVA substation.

short circuit MVA = 20000MVA

X/R Ratio = 34.1

short circuit current = 52.486kA

From the above i want to know how to calculate %Resistance(R) & %Reactance(X)

Kindly help me

Thanks & Regards,

LSK
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Anonymous Poster
#1

Re: TO FIND %R & %X VALUE

07/20/2010 1:03 PM

Are you serious ? normally we find it from short circuit test of transformer. find impedance voltage it will be there in percentage on the TFR. Divide it with full load primary current to get primary impedance. With ratio we get secondary (1/34)^2 x Z01. Z=sqrt(R^2+X^2) Z01=Vsc/I1 W=I1^2 X R01 R01=W/I1^2 X01=sqrt(Z01^2-R01^2) -Hithu-
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wareagle
Guru
United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1604
Good Answers: 63
#2

Re: TO FIND %R & %X VALUE

07/20/2010 6:48 PM

Check this information http://www.arcadvisor.com/reference.html
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Anonymous Poster
#8
In reply to #2

Re: TO FIND %R & %X VALUE

07/21/2010 4:27 PM

thank you
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Anonymous Poster
#3

Re: TO FIND %R & %X VALUE

07/20/2010 6:49 PM

Homework?
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3
Anonymous Poster
#4

Re: TO FIND %R & %X VALUE

07/20/2010 11:16 PM

Holy &%#(

You're designing a substation and don't know how to calculate resistance?
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Anonymous Poster
#7
In reply to #4

Re: TO FIND %R & %X VALUE

07/21/2010 4:26 PM

If you are the electrical engineer tell me the calculation
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hkian
Commentator

Join Date: Jan 2010
Posts: 73
Good Answers: 1
#5

Re: TO FIND %R & %X VALUE

07/21/2010 9:36 AM

Please review your basics..

I don't know how they chose you design a substation yet alone you don't know the basics... please go back to your electrical circuit lessons you could apply it here.
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Anonymous Poster
#6
In reply to #5

Re: TO FIND %R & %X VALUE

07/21/2010 4:25 PM

if you have the strong basis kindly tell me calculation
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hkian
Commentator

Join Date: Jan 2010
Posts: 73
Good Answers: 1
#10
In reply to #6

Re: TO FIND %R & %X VALUE

07/21/2010 10:57 PM

the calculation would be...

first go back to your electric circuit lessons then tell me after you have done it..
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Anonymous Poster
#9

Re: TO FIND %R & %X VALUE

07/21/2010 7:39 PM

Please my suggestion to you, do not design.
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Anonymous Poster
#11
In reply to #9

Re: TO FIND %R & %X VALUE

07/22/2010 2:33 AM

Dear I know you don't know the calculation. This website designed for professional not for you. My humble request is don't use this website again.
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