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Key Technical Specifications
- Product Model: REF542plus
- Manufacturer: ABB
- System Family: Relion® 542 series
- Protection Functions: Overcurrent (phase/earth), thermal overload, breaker failure, auto-reclosing, voltage/frequency protection (depending on configuration)
- Rated Voltage: Up to 36 kV system voltage (with compatible VTs/CTs)
- Current Inputs: 1A or 5A (configurable)
- Communication Protocols: IEC 61850 (Edition 2), Modbus RTU/TCP, DNP3, PROFIBUS DP (optional)
- Hardware Interfaces: 2× Ethernet (RJ45), RS-485, IRIG-B time synchronization, binary I/O (up to 16 DI / 8 DO standard)
- Mounting: Flush or surface mounting (front panel IP54, rear IP20)
- Certifications: IEC 60255, IEEE C37.90, CE, UL, CSA
Core Performance and Selection Advantages
The REF542plus delivers a high degree of integration in a compact footprint, combining protection, control, metering, and communication in a single device—eliminating the need for separate meters, PLCs, or auxiliary relays in many feeder applications. Its native support for IEC 61850 Edition 2 enables seamless integration into modern digital substations, reducing wiring complexity through GOOSE messaging and sampled values (when used with merging units). The relay features advanced self-monitoring capabilities, including real-time diagnostics of CT/VT circuits, internal hardware health, and communication status, which enhance predictive maintenance and reduce unplanned outages. From a usability standpoint, the front-panel LCD with navigation buttons allows local operation without external tools, while the PCM600 engineering software (or ABB Ability™ Edifice) provides intuitive configuration, testing, and firmware updates. Compared to legacy electromechanical or early digital relays, the REF542plus offers faster fault clearance, adaptive protection settings, and remote access—improving both grid resilience and operational efficiency.
ABB REF542plus
System Integration and Scalability
Integration of the REF542plus into new or upgraded substations is streamlined through ABB’s standardized engineering workflows. Using PCM600 or the web-based ABB Ability™ platform, engineers can configure protection logic, assign IEC 61850 logical nodes, and simulate faults—all within a unified environment. The relay supports peer-to-peer communication via GOOSE for fast interlocking (e.g., breaker failure tripping adjacent feeders) without requiring a central controller. For SCADA connectivity, it acts as an autonomous data source, publishing real-time measurements (kW, kvar, kWh, power factor) and event records directly to control centers. In distributed generation applications, its under/over frequency and voltage protection functions help comply with grid code requirements (e.g., IEEE 1547). The modular I/O design allows expansion via add-on modules (e.g., additional binary inputs or analog outputs), enabling adaptation to evolving project needs. Furthermore, cybersecurity features—including role-based access, audit logs, and secure firmware signing—align with NERC CIP and IEC 62351 standards, making it suitable for critical infrastructure deployments. As part of ABB’s long-term product strategy, the REF542plus benefits from ongoing firmware enhancements and extended lifecycle support, ensuring compatibility with future smart grid initiatives.
