How can I calculate transformer resistance and reactance having X/R, %Z, MVA, and kV from primary and secondary voltages?

David Martinez @David_Martinez153

09 September 2018 1 5K Report

i need in ohms X and R

I have

X/R=45

MVA=250

kV prim=230

kV sec=34.5

%Z=12.5

Mohammad Fawad Shaikh

First Of All You Have To Find The Base Impedance That Is ((kV)^(2))/(MVA) After Finding That Multiply Your Per Unit/ Percentage Impedance With Base Impedance Through This Actual Impedance Of Transformer Is Found. Now Through X/R Ratio You Can Find The Resistance And Reactance Of Transformer In Your Case Adjust The Equation Like This :

X = 45*R

X = ((Z)^(2)-(R)^(2))^(1/2)

Compare Both

((Z)^(2)-(R)^(2))^(1/2) = 45*R

Through This You Will Get The Resistance Of Transformer And Put This Resistance Value In X/R Ratio You Will Get The Reactance Of Transformer

I Hope It Will Help You

Thanks

Regards

Mohammad Fawad Shaikh

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