Q.

For complete protection of a 3-phase transmission line, we require

  • AThree-phase and three-earth fault relays.
  • BThree-phase and two-earth fault relays.
  • CTwo-phase and two-earth fault relays.
  • DTwo-phase and one-earth fault relays.
Correct Answer : (D)

Two-phase and one-earth fault relays.

Hints :

For complete protection of a 3-phase transmission line, we require Two-phase and one-earth fault relays.

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