Power Systems
Where the voltage is high and current to be interrupted is low, Which of following the breaker is preferable?

 Air blast CB.
  Vacuum CB.
 Any of these.
 Oil CB.

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Power Systems
The value of off diagonal elements is

 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
 sum of admittances connected at bus i

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