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A pilot relay is used for
1. High speed tripping
2. Delayed tripping
3. Pre-set tripping
4. No tripping

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Correct Answer - Option 1 : High speed tripping

Pilot wire differential relays:

  • The pilot wire differential relay is a high-speed relay designed for the protection of transmission and distribution lines.
  • They are generally applied on short lines, normally less than 50 km long.
  • The scheme requires a communication channel (link) to carry system voltage and current information to the control location.
  • The main objective of using pilot relaying is to remote control the circuit breakers.

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