MRP2-R3IU Power and Reverse Power Protection Relay

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General HighTECH Line User Manual

The power relay MRP2-R3IU is used in 3-phase systems for active power measurement, especially for application fields (i.e. turbine movers) where two reverse power switching points with higher precision are required.

Among others, the MRP2-R3IU relays serve:

  • as reverse power relay to protect turbines and Diesel gensets from reverse power if this prime mover fails. For generators operating in parallel with a mains or another generator, it is imperative to supervise the power direction. If for example the prime mover fails the alternator operates as a motor and drives the prime mover (diesel or turbine). The MRP2-R3IU “recognizes” the reverse of the power direction and – in case of this error – switches off the alternator. This way, power losses and damages of the prime mover are avoided.

  • as voltage dependent reverse power relay for mains decoupling. The criterium for tripping the voltage-dependent reverse power element is the reverse power with simultaneous voltage decrease as a result of an external mains fault. Decoupling prevents external mains faults from affecting the own mains section. Internal faults are selectively detected by other protection devices.

Benefits and Key Features

  • 19“ racks – fully withdrawable

  • Door mounting – withdrawable and sealable

  • Panel mounting – fully withdrawable

  • Fault / disturbance recorder

  • Intuitive HMI

  • Display (of primary values)

  • Easy setting software – Smart view

  • Compact form factor


Protection of electrical (HV, MV) synchronous generators against:

  • Reverse Power (indicating outage of the prime mover)

  • Circuit breaker failure protection (ANSI / IEEE C37.2: 50BF)

Inputs and Outputs
Binary inputs 2
Current transformer inputs 3
Output relays 4
Voltage transformer inputs 3
Watchdog relay 1
Protection ANSI
Circuit breaker failure protection 50BF
Power direction 32/37
Additional Features
Fault recorder (none volatile)
Parameter sets 1
Modbus RTU (Option)
RS485 Open Data Protocol (Option)
Mounting Type
Housing is withdrawable
Housing suitable for 19” rack mounting (Option)
Housing suitable for door mounting (Option)
Housing suitable for mounting plate

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