Power Systems
To prevent maloperation of deferentially connected relay while energizing a transformer, the relay restraining coil is biased with

 7th harmonic current.
 3rd harmonic current.
 2nd harmonic current.
  5th harmonic current.

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Power Systems
The value of off diagonal elements is

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

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