ABB REF542plus Multifunction Protection Control Unit

Technical Specifications

Model: REF542plus

Brand: ABB

Product Type: Multifunctional protection and control terminal

Application: Medium‑voltage system 3kV‑36kV feeder, motor, transformer protection

Auxiliary Supply: 24‑250VDC / 100‑240VAC wide range power supply

Rated CT Input:1A / 5A

Rated PT Input:100V AC

Frequency:50Hz / 60Hz

Communication: Ethernet, RS485, fiber interface; Protocol: IEC61850, Modbus, DNP3.0, SPA‑Bus

Protection Functions: Overcurrent, earth‑fault, directional protection, distance protection, thermal overload, motor locked‑rotor, frequency protection, auto‑reclosing, synchro‑check function

Installation: Panel mounting for medium‑voltage cabinet

Operating Temperature:‑25℃ ~ +70℃, non‑condensing

Protection Class:IP20

Weight:0.95kg

Dimension:264mm ×216mm ×72mm

Compatible System: Power plant, metallurgy, petrochemical medium‑voltage switchgear cabinet

Core Function: REF542plus integrates protection, measurement, control and fault recording in one unit. It provides complete protection logic for medium‑voltage feeders, motors and transformers. It realizes fault trip, circuit‑breaker local/remote control, event recording and fault waveform recording, supports FUPLA custom logic programming and IEC61850 GOOSE interlocking, guarantees safe and reliable operation of medium‑voltage power distribution system.

Product Details

The REF542plus is ABB multifunctional protection control terminal for medium‑voltage power system protection.

This protection unit is installed inside medium‑voltage switchgear panel. It receives current and voltage signals from CT and PT, executes rich protection algorithms including overcurrent, earth‑fault, distance, thermal overload, motor‑specific protection and frequency protection. It supports auto‑reclosing, synchro‑check and breaker control functions. Adopts FUPLA visual programming, users can configure customized interlock and automation logic according to site requirements.

Equipped with front‑panel LCD display and multi‑channel LED status indicators for local parameter checking and fault viewing. Built‑in fault recorder, event log and waveform capture function, which is convenient for post‑fault analysis. Multiple communication interfaces support upper‑system networking monitoring. Hardware self‑diagnosis can detect internal failure and channel abnormality, upload alarm information to monitoring background.

It belongs to classic medium‑voltage protection device, widely used for spare‑part replacement and overhaul of old medium‑voltage switchgears in power plant, metallurgy, chemical industry.

It is important spare hardware for medium‑voltage protection loop debugging and defective REF542plus unit replacement.