The relation between the old and new per unit impedance values is given by:

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The relation between new per-unit value & old per unit value impedance

Also 

 

Where,

(Zpu)new = New per unit value of impedance

(Zpu)old = Old per unit value of impedance

kVbase = Old base value of voltage

kVnew = New base value of voltage

MVAnew = New base value of power

MVAold = Old base value of power

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