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Woodward MRR1-D Protection relay
The MRR1-D is a multi-functional generator rotor protection relay from the Woodward High Tech Line series. It integrates three core protections: rotor grounding fault, over/under current excitation, and rotating diode fault. It is compatible with synchronous generator/motor rotor systems of 1MVA and above, and features high-resistance grounding detection, isolated excitation current measurement, and remote communication capabilities. It is widely used in power plants, industrial power generation, and marine power plants, primarily for in-service system spare parts maintenance.
Core Performance: Protection Functions and Measurement Capabilities
Rotor Grounding Protection: 0.5Hz test frequency, capable of detecting high and low resistance grounding faults; dual-stage insulation resistance (alarm/trip) independent setting; measurement input with short-circuit/overvoltage protection.
Excitation Current Monitoring: Hall sensor isolated measurement (0-20A DC), supports overcurrent/undercurrent/ripple detection (rotating diode fault), independent current and delay settings, real-time display of excitation current.
Fault Classification Response: 2 trip relays (excitation current/diode fault), 2 alarm relays, supports protection function interlocking and programmable output relay allocation, adaptable to different protection logics. Electrical and Communication
Power Supply: 24V DC, Class 1, Div 2 explosion-proof, with overvoltage/reverse connection protection, operating temperature -20℃ to 60℃, vibration/electromagnetic interference resistant, suitable for harsh industrial/marine environments.
Interfaces: Includes RS485 (Modbus RTU), digital input (lockout/remote reset), supports remote monitoring and data acquisition, compatible with power station DCS/PLC systems.
Diagnosis and Maintenance
Real-time display of insulation resistance and excitation current, self-diagnosis of faults (grounding faults, abnormal current, diode failure, etc.), rapid fault location.
Supports on-site programming and parameter adjustment, menu-driven operation, convenient maintenance, suitable for generator maintenance without shutdown.
Email: xmxblynn@163.com
Phone: +86 18059884797
Key Technical Parameters
Parameter Value
Model MRR1-D (Multi-functional Generator Rotor Protection Relay)
Suitable for: ≥1MVA synchronous generator/motor rotor systems
Ground fault detection: 0.5Hz test frequency, dual-stage protection for high and low resistance faults
Excitation current measurement: 0-20A DC, Hall isolation, overcurrent/undercurrent/ripple detection
Power supply: 24V DC, Class 1, Div 2 explosion-proof, operating temperature -20℃ to 60℃
Outputs: 2 trip relays, 2 alarm relays, programmable allocation
Communication: RS485 (Modbus RTU), supports remote monitoring and reset
Status: In-service system spare part, used for High Tech Line platform maintenance
Typical Applications: Large synchronous generator rotor protection: Suitable for power plants and industrial self-contained substations with a capacity of ≥1MVA synchronous generators, monitoring rotor insulation, excitation current, and rotating diode status to prevent rotor damage caused by ground faults and abnormal excitation.
Marine Power Plant Rotor Safety: Ensures the stability of the ship's synchronous generator rotor system, adapting to marine salt spray and vibration conditions, and reducing the risk of power interruption during navigation.
Industrial Motor Rotor Monitoring: Used for grounding and excitation protection of large synchronous motor rotors, suitable for heavy-duty conditions in petrochemical, metallurgical, and other industries, extending equipment life.
Spare Parts Replacement and System Maintenance: Compatible with the deployed High Tech Line platform, used for replacing fault protection relays, ensuring protection accuracy and system compatibility.
Email: xmxblynn@163.com
Phone: +86 18059884797
Other related product models recommended:
Woodward SA-4654 1751ES SA4654
Woodward 8200-226
WOODWARD 8272-582
Woodward SPM-D10
WOODWARD TG-13 8516-038
WOODWARD 8440-1925B
Woodward DPG-2201-001
Woodward LS-521 8440-1947
woodward 8440-1666
Woodward9907-1181
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8237-1597 WOODWARD
Woodward ESDR4
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