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 super-vises the DC excitation current of brushless excitor machines. The protective functions are: Undercurrent, over current and ripple detection for diode failure protection.
FEATURES & FUNCTIONALITY
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 super-vises the DC excitation current of brushless excitor machines. The protective functions are: Undercurrent, over current and ripple detection for diode failure protection.