Technical Specifications Multi‑stage over‑current, earth‑fault and directional protection function groups. Standard analog input, binary input and binary output channel configuration. Supports IEC61850, Modbus, IEC60870‑5‑103 communication protocols. Auxiliary power supply 80‑250 V DC / 85‑265 V AC. Typical power consumption 11.8 W. Operating temperature ‑25 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Front‑panel protection grade IP40, rear terminal area IP20. CE and IEC standard certifications are available.
Functional Features Provides instantaneous and time‑delay over‑current, directional earth‑fault protection for medium‑voltage distribution feeders. Measures current, voltage, active power, reactive power and energy parameters. Collects circuit‑breaker and disconnector position signals, realizes local and remote switchgear control. Stores sequence‑of‑event logs and disturbance fault waveforms. Front‑panel HMI completes parameter setting and status browsing. LED indicators display power supply, running, trip and alarm status. Built‑in hardware self‑diagnosis monitors internal operating condition continuously.
Application Scenarios Installed inside medium‑voltage switchgear cabinet. Applied for feeder protection and control in utility distribution substations and general industrial enterprise power distribution systems. Suitable for new‑built and retrofitted medium‑voltage distribution automation projects.
Installation Requirements Secure device firmly inside medium‑voltage switchgear cabinet. Connect auxiliary power supply within rated operating voltage range. Wire CT, VT and binary loops strictly following engineering schematic drawings. Deploy communication cables for remote monitoring function. Download protection settings and project configuration files by supporting engineering software. Complete protective grounding complying with power industry specifications. Inspect front‑panel LED working state after power‑on.
Usage Notes Wear anti‑static wrist strap before accessing internal circuit assemblies. Comply with high‑voltage safety operation procedures for CT and VT secondary‑circuit work.
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