Positive Sequence Resistance and Reactance calculation

Hi,

I have following two parameters with me

a) Maximum three phase fault current in amperes (A) and phase angle in degrees (B).

I want to calculate the positive sequence resistance (R) and reactance (X) from above two variables for a symmetric system. I couldn't figure out a way to find R and X values using just these two parameters. However I noted somebody has calculated this using following formula for same purpose (unfortunately couldn’t verify who did this in my workplace).

R = A * COS (PI()*B/180)   X = A * SIN (PI()*B/180) where A is the three phase fault current and B is the phase angle

If someone can assist me to figure out the correct formula and the relation above, please

Thanks

You can read this,
* http://www.electrical4u.com/electrical-fault-...on-positive-negative-zero-sequence-impedance/
* http://www.egr.unlv.edu/~eebag/740-symmetrical%20fault%20current%20calculations.pdf
* https://www.eiseverywhere.com/file_uploads/a4...1cba17ff378633_SymmetricalComponents_2013.pdf