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

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

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Power Systems
ACSR means

 Aluminium copper steel reinforced
 all conductor steel reinforced
 Aluminium core steel reinforced
 Aluminium conductor steel reinforced

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