Technical Specifications Multi‑stage over‑current, earth‑fault, directional protection function groups. Analog input channels for CT and VT signal acquisition. Configurable binary input and binary output channels. Supports IEC61850, Modbus, IEC60870‑5‑103 communication protocols. Auxiliary power supply 80‑250 V DC / 85‑265 V AC. Typical power consumption 12 W. Operating temperature range ‑25 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Front‑panel protection grade IP40, rear terminal area IP20. Certifications include CE and IEC standard compliance.
Functional Features Provides instantaneous and time‑delay over‑current, directional earth‑fault, negative‑sequence protection for distribution feeders. Measures current, voltage, active power, reactive power and energy parameters. Collects position signals of circuit‑breakers and disconnectors, realizes local and remote switch control. Stores sequence‑of‑event logs and disturbance fault waveforms. Front‑panel HMI completes parameter setting and status browsing. LED indicator array displays power supply, running, trip and alarm status. Built‑in full‑range hardware self‑diagnosis detects internal faults and triggers alarm output.
Application Scenarios Mounted inside medium‑voltage switchgear cabinet. Applied for feeder protection, measurement and control in utility distribution substations and industrial enterprise power distribution systems. Suitable for new‑built and retrofitted medium‑voltage distribution automation projects.
Performance Parameters Protection operation speed meets medium‑voltage distribution network protection requirements. Disturbance recorder captures high‑resolution fault transient waveforms. Event log supports millisecond‑level time stamp recording. Measurement accuracy satisfies power distribution monitoring standards. Internal hardware faults generate definite alarm signals without interfering normal protection channels.
Installation Requirements Secure the device firmly inside medium‑voltage switchgear cabinet. Connect auxiliary power supply strictly within rated voltage range. Complete CT, VT, binary input‑output wiring in accordance with engineering schematic drawings. Connect communication cables for remote monitoring function. Download protection settings and application configuration through supporting engineering software.
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