RMQ-111D & RMQ-121D

Loss of Excitation Relay/Over-excitation Relay

This Uni-line relay protects generators running in parallel with other generators from running as an induction generator due to under-excitation – particularly in cases where applying an under-voltage relay for protection is insufficient.

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RMQ 111D Front RMQ 121D Front RMQ 121D Angle

The RMQ-111D will thus protect the generator against damages caused by excessive heating due to slip frequency current flow, at the same time preventing transfer of reactive load from a faulty generator.

The RMQ-121D relay protects generators against overexcitation and will prevent it from generating too high currents in case of heavy inductive loads.

The RMQ-121D will thus protect the generator against damages caused by excessive heating of its windings, at the same time preventing transfer of reactive load to a faulty generator.

Variants

RMQ-111D

  • Excitation loss
  • -Q>: 0 to 25%
  • 1 VAr 3 (4)

RMQ-121D

  • Overexcitation
  • Q>: 25 to 125%
  • 1 VAr 3 (4)

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