Differential Protection

MDR-2

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The MDR-2 is a state-of-the-art combined differential protection and short-circuit protection relay for generator protection against internal short circuits (leaking currents). 

RMC-131D

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DEIF's differential current relay RMC-131D protects the generator against short circuits and leakage currents in the windings of the generator. 

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Voltage Protection

RMV-112D

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DEIF's RMV protective voltage relays are applied for generator, motor and transformer protection against adverse system voltage conditions. The versatile unit features a number of adjustable parameters. 

  • Under- and over-voltage
  • U>: 100 to 120 %, U<: 80 to 100 %

RMV-122D

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DEIF's RMV protective voltage relays are applied for generator, motor and transformer protection against adverse system voltage conditions. The versatile unit features a number of adjustable parameters.  

  • Over-voltage (double)
  • U>: 100 to 120 %, U>: 100 to 120 %

RMV-132D

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DEIF's RMV protective voltage relays are applied for generator, motor and transformer protection against adverse system voltage conditions. The versatile unit features a number of adjustable parameters.  

  • Under-voltage (double)
  • U<: 80 to 100 %, U<: 80 to 100 %

RMV142D

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DEIF's RMV protective voltage relays are applied for generator, motor and transformer protection against adverse system voltage conditions. The versatile unit features a number of adjustable parameters.  

  • Under- and Over-voltage
  • U>: 100 to 120 %, U<: 80 to 100

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Frequency Protection

RMF-112D

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The digital RMF-112D unit is part of DEIF’s complete range of relays for generator protection and control.

Applied for protection against under-frequency and overfrequency by supervising the frequency (of generators) in single-phase and 3-phase networks, RMF-112D is applicable for installations with a number of adjustable parameters.

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Current and Short Circuit Protection

RMC-111D

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The RMC-111D short circuit relay is applied in cases where only protection against short circuit currents is required. 

RMC-121D

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The RMC-121D combined short circuit and over-current relay is applied for protection of generators against both over-currents and short circuit currents. 

RMC-132D

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This double over-current relay is applied in cases where protection against over-currents at two levels is required. 

RMC-142D

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DEIF's RMC-142D stator earth fault relay protects genset operators against electric shock in case of earth faults in the generator's stator. 

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Loss of Mains Protection

LMR-111D

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DEIF's loss of mains relays protect generators against damage resulting from a non-synchronised reconnection to the grid after a temporary mains failure. 

  •  Vector shift 

LMR-122D

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DEIF's loss of mains relays protect generators against damage resulting from a non-synchronised reconnection to the grid after a temporary mains failure. 

  • Vector shift and df/dt (ROCOF) 

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Power Protection

RMP-111D

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The RMP-111D is a protective overload power relay for generator and prime mover protection. 

RMP-112D

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The RMP-112D is a protective overload and reverse power relay for generator and prime mover protection. 

RMP-121D

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DEIF's RMP-121D is a protective reverse power relay for generator and prime mover protection. 

Loss of Excitation

RMQ-111D

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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.  

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

RMQ-121D

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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.  

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

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