Description
CT secondary rated: 1 A / 5 A configurable
System frequency: 50 Hz / 60 Hz
Auxiliary supply: 24‑250 V DC / 85‑265 V AC wide‑range power
Total power consumption: ≤15 W
Local HMI: Detachable graphic LCD display, function push‑buttons and LED status indicators
Communication interfaces: Ethernet, optical serial port, RS485; supports SPA, Modbus RTU, IEC 60870‑5‑103
Fault recording: COMTRADE disturbance recorder, max 5 fault records storage
Binary I/O: Flexible expansion via plug‑in slot boards
Mounting mode: Flush‑mount inside medium‑voltage switchgear cubicle, HMI panel mounted on cabinet door
Operating temperature: −25 ℃ ~ +55 ℃
Storage temperature: −40 ℃ ~ +85 ℃
Humidity: 5‑95 %RH non‑condensing
EMC compliance: IEC 60255‑22‑1 /‑22‑2 /‑22‑3
Certifications: CE, UL, IEC 60255 approval
Phase overcurrent protection (definite‑time / inverse‑time IDMT), earth‑fault protection, directional overcurrent protection, thermal overload protection, over‑voltage / under‑voltage protection. Built‑in auto‑reclosing function (1‑5 shots configurable). Realize local / remote control for circuit‑breaker, bay interlock logic, trip‑circuit supervision. Complete voltage, current, power and energy measurement. Event sequence logging and fault disturbance recording. Hardware self‑diagnosis, fault alarm report. Configuration and parameter setting via PCM600 / REL54 engineering software.
Difference compared with REF543: REF542plus is medium‑voltage feeder‑oriented terminal with detachable door‑mount HMI; REF543 is fixed‑panel structure for high‑voltage application, hardware modules are not interchangeable.
Main unit installed inside switchgear cubicle, HMI panel mounted on cabinet front door. Secondary wiring for CT shall strictly avoid CT secondary open‑circuit risk. Auxiliary power supply must match rated range. After replacement, download complete project configuration, perform protection function test, breaker control test, binary input/output point‑to‑point check and communication test with SCADA system. Confirm no hardware self‑diagnosis fault alarms.
Medium‑voltage switchgear in power plants, industrial power distribution and urban substations. Used for feeder protection, transformer protection and motor protection in 6‑35 kV secondary‑circuit systems.
- Protect‑IT series multifunctional protection & control IED for medium‑voltage switchgear application.
- Separated HMI and main‑unit design, HMI door‑mount installation, convenient for local operation.
- Rich built‑in protection functions, configurable auto‑reclosing, thermal overload and bay interlock logic.
- Flexible plug‑in I/O expansion, multiple communication protocol support.
- Integrated measurement, event log and disturbance recording functions.
- Discontinued legacy ABB spare‑part, for maintenance and retrofitting of existing medium‑voltage protection systems.
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