Technical Specifications Over‑current and earth‑fault protection function set. Analog input for current and voltage measurement. Binary input for switch status acquisition, binary output for trip and control command. Serial communication interface available. Auxiliary power supply range 80‑250 V DC / 85‑265 V AC. Typical power consumption 12 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 Implements phase over‑current, time‑delay over‑current and earth‑fault protection for distribution feeder. Measures current, voltage, power and energy value. Collects circuit‑breaker and disconnector position signal. Supports local and remote circuit‑breaker control. Stores fault event records. Front‑panel keys and display realize local operation and parameter check. LED indicators show power, running, trip and alarm status. Built‑in hardware self‑diagnosis.
Application Scenarios Mounted in medium‑voltage switchgear cabinet. Used for protection, measurement and control of industrial and utility distribution feeder. Applies to power distribution substation, factory internal medium‑voltage power system. Fits retrofit and new‑build medium‑voltage switchgear projects.
Performance Parameters Protection operation time complies with medium‑voltage distribution network protection requirement. Fault event log records key fault information. Self‑diagnosis function detects internal hardware abnormality and gives alarm signal. Measurement accuracy meets distribution monitoring requirement.
Installation Requirements Fix relay inside medium‑voltage switchgear cabinet. Connect auxiliary power supply within rated operating range. Wire CT, VT secondary circuit, binary input and output wiring according to schematic drawing. Connect communication cable if remote monitoring is required. Upload protection setting parameters through configuration tool. Complete protective grounding complying with power system requirement. Verify front‑panel indication after power‑on.
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