ABB REB500 Busbar Protection Relay

ABB REB500 Relion Busbar and Backup Protection Relay

The REB500 is a high-integrity protection relay within the ABB Relion family, specifically engineered for high-impedance-based applications in utility and industrial power systems. As a mechanical necessity for station stability, it serves as a primary busbar protection unit and a versatile multipurpose backup relay. 

Technical Specifications

• Manufacturer: ABB

• Model Designation: REB500

• Product Series: Relion 611/500 series

• Protection Principle: High-impedance differential protection

• Application Range: Busbars, Generators, Motors, Transformers, Reactors

• Communication Standards: IEC 61850 Edition 1 and 2, GOOSE messaging

• Redundancy Protocols: HSR (High-availability Seamless Redundancy) and PRP (Parallel Redundancy Protocol)

• Interface: Web-browser-based HMI with integrated I/O matrix

• Installation Style: Withdrawable plug-in unit

• Mechanical Design: Compact footprint for space-optimized mounting

• Configuration: Factory-tested, application-specific standard configuration

• Network Connectivity: Optional second Ethernet bus for self-healing loops

Key Functional Characteristics

Specialized Busbar and REF Protection

The REB500 excels in high-impedance schemes where high-speed fault clearance is critical to prevent equipment destruction. It provides reliable zone protection for busbars and acts as a sensitive monitor for internal winding faults in transformers and motors (Restricted Earth-Fault). Its high-impedance logic ensures that the relay remains stable during external through-faults while maintaining microsecond response times for internal zone faults.

Modular Maintenance and Swift Testing

The relay features a withdrawable plug-in unit design, allowing for the active electronics to be removed without disturbing the primary terminal wiring. This mechanical advantage drastically shortens the Mean Time To Repair (MTTR) and allows for safe, convenient bench testing or unit replacement during critical maintenance windows, minimizing costly system downtime.

Resilient Digital Communication

Fully compliant with IEC 61850 Editions 1 and 2, the REB500 integrates seamlessly into modern digital substations. It supports binary GOOSE messaging for high-speed horizontal communication between IEDs. With the optional second Ethernet bus, the device implements HSR or PRP redundancy, ensuring that the protection system maintains communication even if a physical network path is severed.