Description
- The WOODWARD MRA4D0AE is a high-performance digital protection relay from the High Tech Line, specifically engineered for the protection and monitoring of medium-voltage power systems. This versatile device provides comprehensive protection functions, including overcurrent, earth fault, and thermal overload monitoring. Designed with advanced microprocessor technology, the MRA4D0AE ensures high reliability, precise measurement, and fast response times in demanding industrial environments. It features a robust communication interface and a user-friendly display, making it an essential component for modern switchgear and power distribution management.
Product Parameters
- Brand: Woodward (formerly SEG)
- Model: MRA4D0AE
- Protection Functions: Overcurrent (Directional/Non-directional), Earth Fault, Thermal Overload
- Supply Voltage: 24V – 270V AC/DC (Universal Power Supply)
- Communication: Modbus RTU / RS485 Interface
- Digital Inputs: 8 Configurable Inputs
- Relay Outputs: 7 Configurable Output Relays
- Display: Integrated Backlit LCD with LED Indicators
- Mounting: Door Mount / Flush Mounting
- Standard Compliance: IEC 60255, CE Certified
- Protection Class: IP54 (Front side)
This relay offers a compact and integrated solution for feeder protection, combining complex logic functions with high-speed fault detection to prevent equipment damage and minimize system downtime in power distribution grids.
Comparison with Similar Models
The MRA4D0AE is distinguished from the base MRA4 models by its specific Input/Output configuration and Communication capabilities. While the MRA4-1 series offers more simplified protection for standard feeders, the “D” designation in the MRA4D0AE indicates advanced directional protection features, making it suitable for ring mains or systems with multiple power sources where fault direction is critical. Additionally, this model utilizes an optimized hardware revision that provides better electromagnetic compatibility (EMC) and a wider universal power supply range compared to older MR series relays.
Operation Tips
- Parameter Configuration: Always use the “Smart view” software or the front-panel HMI to verify that the CT (Current Transformer) ratios are correctly programmed before commissioning the unit.
- Password Security: Change the default access code during the initial setup to prevent unauthorized changes to the protection curves and trip settings.
- Fault Analysis: Utilize the integrated disturbance recorder and event buffer to analyze the root cause of a trip; the relay can store detailed waveform data for the last few fault events.
- Maintenance Testing: Use the built-in “Test Mode” to simulate fault currents through the secondary injection method without triggering external trip circuits, allowing for safe periodic verification of the relay logic.
