REF 541, REF 543 and REF 545 Feeder terminals

Communication

The device provides two serial communication ports for seamless system integration.

• Front Port: An optical port (RS-232) using the SPA bus protocol, mainly for local PC connection and configuration.

• Rear Port: A 9-pin port (RS-485), with selectable SPA or LON bus protocols. The LON bus can be used for peer-to-peer communication, significantly reducing hardwiring between terminals. The SPA bus communication rate is up to 19.2 kbps, and the LON bus is up to 1.2 Mbps.

Data Recording & Analysis

• Transient Disturbance Recorder: Can record waveforms for up to 16 analog channels and 16 digital channels. The nominal sampling frequency is 2kHz in a 50Hz system. Recorded data can be uploaded and converted to the standard COMTRADE format using the DR-Collector tool.

• Event Recorder: Records the latest 100 events with precise timestamps.

Application Areas

The flexibility of the REF 54 series allows for its wide application in various medium voltage scenarios:

• Feeder Protection: For cable and overhead line feeders in radial, ring, or meshed networks.

• Incomer Protection: For the protection and control of main incomers or bus-tie bays in substations.

• Motor Protection: Provides a comprehensive protection scheme for medium-sized asynchronous motors.

• Capacitor Bank Protection: Offers specialized protection functions for reactive power compensation capacitor banks.

Conclusion

The ABB REF 541/543/545 feeder terminals offer a powerful and compact solution for medium voltage distribution networks by highly integrating advanced protection, control, measurement, and monitoring functions into a single device. Their support for both traditional and modern sensing technologies, multiple communication protocols, and flexible I/O configurations ensures their wide applicability in new and retrofit projects, making them an ideal choice