Power Systems
Advantage/s of per unit system as compare to absolute system?

All of these
 memory required is less
 only one equation is required
 calculation time is less

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Power Systems
The value of off diagonal elements is

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

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