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A negative sequence relay is commonly used to protect


1. An alternator
2. A transformer
3. A transmission line
4. A bus bar

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Correct Answer - Option 1 : An alternator

Negative sequence relay:

  • It protects generators from the unbalanced load by detecting negative sequence current.
  • A negative sequence current may cause a dangerous situation for the machine.
  • Phase to phase fault mainly occurs because of the negative sequence component.
  • The negative sequence relay has earthing which protects from phase-to-earth fault but not from phase-to-phase fault.

Note: 

Relay

Application

Buchholz relay

Transformer

Translay relay

Feeder

Carrier current, phase comparison relay, Mho's relay

Long overhead transmission line

Directional overcurrent relay

Ring main distributor

Negative sequence relay

Generator

Inverse directional overcurrent relay Radial distribution

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