Power Systems
To protect the power transformer ( Y-Y with neutral grounded) against fault, which type of connection do the current transformers have?

 Y-Y connection
 Δ-Δ connection
 Y-Δ connection
 Δ-Y connection

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

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