The Threshold characteristics of a plain impedance relay in a complex Z plane is a 

  • ACircle passing through origin.
  • BCircle with the centre at the origin.
  • CStraight line passing through origin.
  • DStraight line offset from the origin.
Correct Answer : (B)

Circle with the centre at the origin.

Hints :

The most serious consequence of a major uncleared short-circuit fault could be


Which of the following results in a symmetrical fault?

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