How is per unit impedance affected in a power system when the voltage changes, if at all?

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David · Accepted Answer

How is per unit impedance affected in a power system when the voltage changes, if at all? 
Solution: 
Per unit impedance in a system is given by: 
    
 
     
 
Where, 
 Z = actual impedance of the system.

How is per unit impedance affected in a power system when the voltage changes, if at all?

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