Power Systems
The load current in short circuit calculations are neglected because

 short circuit currents are greatly out of phase with load currents
 nether 1 nor 2
 short circuit currents are much larger than load currents
 both 1 and 2

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Power Systems
Per unit of any quantity is defined as

 actual value of quantity /base value of quantity in different units
 base value of quantity /actual value of quantity in different units
 base value of quantity /actual value of quantity in same units
 actual value of quantity /base value of quantity in same units

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