Technical Specifications Phase over‑current, earth‑fault protection function. Analog current input channel, optional voltage input. Binary input for switch status acquisition, binary output for trip and control. Communication interface available. Auxiliary power supply 80‑250 V DC / 85‑265 V AC. Typical power consumption 10 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 Executes time‑delay and instantaneous over‑current protection and earth‑fault protection for distribution feeder. Measures feeder current and voltage value. Collects circuit‑breaker position signal, supports local and remote trip‑close control. Stores basic fault event records. Front‑panel keys and display support local parameter checking and setting. LED indicators display power, running, trip and alarm state. Built‑in hardware self‑diagnosis function.
Application Scenarios Installed in medium‑voltage switchgear cabinet. Applied for feeder protection of utility distribution substation and industrial enterprise medium‑voltage power system. Suitable for cost‑sensitive new‑build and retrofit distribution switchgear projects.
Installation Requirements Fix relay inside medium‑voltage switchgear cabinet. Connect auxiliary power supply within rated voltage range. Wire CT secondary circuit, binary input and output wiring strictly per engineering schematic. Connect communication cable for remote monitoring if required. Download protection setting parameters by configuration tool. Complete protective grounding complying with power system specification. Check front‑panel LED working status after power‑on.
Usage Notes Take anti‑static measure before accessing internal circuit components. Follow high‑voltage safety specification for CT secondary circuit operation. Forbid disassembly under powered state. Inspect terminal screw tightness periodically. Verify protection setting value during regular maintenance.
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