Product Description
Woodward MRI4A0AB Multifunction Protection Relay
Product Overview
- The Woodward MRI4A0AB is a digital Multifunction Protection Relay designed for advanced protection and monitoring of electrical systems, including feeders, transformers, generators, and motors, in power distribution and industrial applications such as power plants, substations, and marine systems. Part of Woodward’s MRI4 series, this microprocessor-based relay offers comprehensive protection against overcurrent, ground faults, voltage anomalies, and other electrical faults, ensuring system reliability and equipment safety. The "A0AB" designation indicates specific firmware or hardware configurations, typically with a focus on multifunction protection without directional capabilities and a standard input configuration. The MRI4A0AB provides precise protection settings, fault diagnostics, and robust communication options for integration into modern power management systems. Compared to Woodward’s MRI3 series (e.g., MRI3I5E5DM), motor protection relays (e.g., MRD1G5MA), or genset controllers (e.g., EasyGen-3500-5, 8440-2087), the MRI4A0AB offers enhanced multifunctionality for broader applications. It is distinct from Woodward’s excitation systems (e.g., DECS-100-B15), electronic governors (e.g., DYN1-10784-003-0-12), actuators (e.g., 8408-921), and other modules (e.g., 5466-1510 CPU).
Technical Specifications
- The MRI4A0AB has the following specifications based on industry sources and Woodward documentation:
| Specification | Details |
|---|---|
| Model/Part Number | MRI4A0AB |
| Manufacturer | Woodward |
| Description | Digital Multifunction Protection Relay |
| Series | MRI4 |
| Function | Protects and monitors feeders, transformers, generators, and motors |
| Processor | Microprocessor-based (specific architecture not publicly detailed) |
| Memory | Flash: 8–16 MB (for firmware and configuration) RAM: 4–8 MB (for runtime data) |
| Display | LED indicators; optional external HMI or PC interface for configuration |
| Inputs | 3-phase current inputs (1 A or 5 A nominal, configurable, 0.1–40 A range) 1 ground fault current input (1 A or 5 A, sensitive ground fault detection) 3-phase voltage inputs (up to 690 V, configuration-dependent) 6 discrete inputs (24 VDC) |
| Outputs | 6 relay outputs (dry contact, up to 250 VAC/5 A) 1 analog output (optional, 4–20 mA) |
| Communication Interfaces | 1 serial port (RS-485, Modbus RTU) CANbus (optional, for integration with control systems) Ethernet (optional, Modbus TCP/IEC 61850) |
| Protection Functions | Overcurrent (instantaneous and time-delayed), ground fault, over/under voltage, over/under frequency, negative sequence, thermal overload, phase imbalance, loss of phase, breaker failure |
| Trip Accuracy | ±5% of set value (current), ±2% (voltage/frequency), ±3% (thermal model) |
| Protection Settings | Configurable trip thresholds, time delays, thermal curves, and characteristic curves (ANSI/IEC) |
| Redundancy | Non-redundant |
| Diagnostics | Fault detection, event logging (up to 300 events), disturbance recording, status LEDs |
| Compatibility | Compatible with Woodward control systems (e.g., EasyGen-3200-5, 8440-2050), SCADA systems, and third-party devices via Modbus or IEC 61850; suitable for feeder, transformer, generator, and motor protection |
| Power Supply | 24–250 V AC/DC (universal input) |
| Power Consumption | Approx. 5–15 W |
| Environmental Specifications | Operating Temperature: -25°C to +70°C (-13°F to +158°F) Storage Temperature: -40°C to +85°C (-40°F to +185°F) Relative Humidity: 5% to 95% non-condensing Vibration: IEC 60068-2-6 compliant Shock: IEC 60068-2-27 compliant |
| Enclosure | IP40 (with proper enclosure); IP20 (rear) |
| Dimensions | Approx. 140 mm (H) x 150 mm (W) x 110 mm (D) |
| Weight | Approx. 1–1.5 kg |
| Mounting | Panel-mounted or DIN rail |
| Certifications | CE, UL, CSA, marine certifications (e.g., DNV, ABS, configuration-dependent); IEC 61850 compliance (optional) |