Power Systems
ACSR means

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

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Power Systems
The value of off diagonal elements is

 which is connected between bus i and bus j with positive sign
 sum of admittances connected at bus i
 sum of admittances connected at bus j
 which is connected between bus i and bus j with negative sign

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