Description
Product Overview
The Woodward MRR1-D is a digital metering and protection relay designed for medium-voltage applications in power generation, distribution, and industrial systems. As part of Woodward’s protection relay portfolio, this advanced device provides comprehensive electrical measurements, protection functions, and control capabilities for generators, motors, transformers, and feeders. The MRR1-D features high-accuracy metering (0.2% class) and programmable protection functions meeting IEEE/ANSI standards, making it suitable for critical infrastructure protection. Its rugged industrial design with IP40 enclosure ensures reliable operation in harsh electrical environments. With multiple communication protocols and event recording, the Woodward MRR1-D delivers enhanced system visibility and diagnostics for modern power systems.
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | MRR1-D |
| Manufacturer | Woodward |
| Product Type | Digital Protection Relay |
| Voltage Input | 100-480V AC (phase-to-phase) |
| Current Input | 1A or 5A AC (configurable) |
| Frequency Range | 45-65Hz |
| Protection Functions | Over/under voltage, overcurrent, earth fault, etc. |
| Metering Accuracy | 0.2% for voltage/current, 0.5% for power |
| Communication | RS-485 Modbus, Ethernet (optional) |
| Relay Outputs | 6× programmable relays |
| Event Recording | 1000+ events with time tagging |
| Power Supply | 24-250V DC or 100-240V AC |
| Operating Temp. | -20°C to +60°C |
| Protection Rating | IP40 |
| Certifications | UL, CE, IEC 60255 |
WOODWARD MRR1-D
Main Features and Advantages
Comprehensive protection: The Woodward MRR1-D offers 20+ programmable protection functions including overcurrent (51), overvoltage (59), undervoltage (27), and earth fault (50N/51N) protection, with IEEE/ANSI standard curves.
Advanced metering: Provides true RMS measurements of voltage, current, power, energy, and power factor with high accuracy (0.2% for basic parameters). The large LCD display shows real-time measurements and status.
Flexible communications: Supports Modbus RTU over RS-485 and optional Ethernet for integration with SCADA and control systems. The relay stores event records with timestamps for fault analysis.
Easy configuration: Intuitive front-panel interface and PC software simplify setup and adjustment of protection parameters. The non-volatile memory retains settings during power loss.
WOODWARD MRR1-D
Application Field
The Woodward MRR1-D is used in:
Generator Protection: Synchronous and induction generators
Motor Protection: Medium-voltage motor protection
Feeder Protection: Industrial power distribution
Transformer Protection: Dry-type and oil-filled transformers
Renewable Energy: Solar and wind power systems
Related Products
MRR1-DE: Version with Ethernet communication
MRR2-D: Advanced model with additional I/O
EGCP-3: Generator control panel
LSM: Load sharing module
2301D: Digital speed control
Installation and Maintenance
Pre-installation preparation: Verify CT/VT ratios and wiring connections before energizing. Ensure proper grounding of the relay and associated equipment. Configure protection settings according to system requirements.
Maintenance recommendations: Perform annual testing of protection functions using secondary injection. Check firmware updates from Woodward for enhanced features. Clean ventilation openings to prevent dust accumulation.
Product Guarantee
Woodward provides a 2-year warranty for the MRR1-D, covering defects in materials and workmanship. Each unit undergoes functional testing before shipment. Technical support is available for configuration and troubleshooting assistance. Calibration services are recommended every 3 years to maintain measurement accuracy.
