MRR1 Rotor Earth Fault Relay (MRR1D)
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Configuration
The generator rotor protection relay MRR1 com-bines rotor earth fault protection, excitation overand undercurrent protection as well as rotating diode failure protection. Thus providing a powerful protection regarding the rotor of synchronous generators, covering the following ANSI codes:
37 DC undercurrent relay
40 Field relay
58 Rectification failure relay
64 Ground detector relay
76 DC over current relay
The MRR1 is recommended for synchronous generators and motors above 1 MVA rating. The rotor earth fault element detects high and low resistance earth faults of the rotor winding.
It is equipped with two stages, one for alarm, one for trip. The excitation current protection element supervises the DC excitation current of brushless excitor machines.
The protective functions are: Undercurrent, overcurrent and ripple detection for diode failure protection.
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:
Underexcitation damages (field failure protection, ANSI / IEEE C37.2: 40)
Stator Earth Fault / insulation damages
Rotor Earth fault detection