Technical Specifications Rich protection function library for feeder, motor and small transformer. Multiple analog input channels for current and voltage. Abundant binary input and binary output channels. Supports serial and Ethernet communication interfaces. Auxiliary power supply 80‑250 V DC / 85‑265 V AC. Typical power consumption 14 W. Operating temperature ‑25 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Front‑panel protection IP40, rear side IP20. Certifications include CE, IEC standard compliance.
Functional Features Provides over‑current, earth‑fault, negative‑sequence over‑current and motor‑specific protection functions. Measures current, voltage, active power, reactive power and energy. Collects primary equipment position signal, realizes local and remote circuit‑breaker control. Stores fault event list and disturbance recording data. Front‑panel HMI supports parameter setting and status browsing. LED indicators reflect power, running, trip and alarm state. Built‑in comprehensive hardware self‑diagnosis function.
Application Scenarios Installed inside medium‑voltage switchgear cabinet. Used for protection and control of distribution feeder, medium‑voltage motor and distribution transformer. Applied in utility distribution substation, petrochemical plant, metallurgy and manufacturing enterprise power system. Suitable for new‑build and renovation medium‑voltage power automation project.
Working Principle After power‑on, REF542PLUS 1VCF752000 finishes hardware self‑check. CT and VT secondary signals enter sampling circuit. Protection algorithm runs continuously, compares real‑time electrical quantity with setting value. When fault condition is satisfied, trip command is sent to binary output channel to operate circuit‑breaker. Measurement value, fault waveform and event data can be checked locally or transmitted to upper monitoring system via communication channel.
Installation Requirements Secure IED inside medium‑voltage switchgear cabinet. Connect auxiliary power supply complying with rated voltage range. Complete CT, VT, binary input‑output wiring strictly per engineering schematic. Connect communication cable for remote monitoring function. Download protection setting and application configuration via engineering software.
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