Technical Specifications Over‑current, earth‑fault and directional protection function groups. Configurable analog input, 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 12.5 W. Operating temperature ‑25 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Front‑panel protection IP40, rear terminals IP20. Meets CE and IEC standard requirements.
Functional Features Executes multi‑stage over‑current and directional earth‑fault protection for medium‑voltage distribution feeders. Completes measurement of current, voltage, power and energy. Collects primary switchgear position signals, supports local and remote circuit‑breaker control. Saves fault event records and disturbance waveform data. Front‑panel HMI supports on‑site parameter adjustment and status viewing. LED indicators show power, operation, trip and alarm status. Built‑in hardware self‑diagnosis detects internal abnormalities and outputs alarm signals.
Application Scenarios Mounted in medium‑voltage switchgear cabinet. Applied in utility distribution substations and industrial enterprise medium‑voltage power systems for feeder protection and control. Suitable for distribution projects with customized hardware configuration demands.
Performance Parameters Protection operation speed complies with medium‑voltage distribution network requirements. Disturbance recorder captures fault transient waveforms. Event log provides millisecond‑accurate time stamps. Measurement accuracy satisfies power distribution monitoring specifications. Hardware faults generate definite alarm output.
Installation Requirements Secure device 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 through supporting engineering software. Complete protective grounding complying with power industry specifications. Inspect LED indication after power‑on.
Usage Notes Wear anti‑static wrist strap before accessing internal circuit assemblies. Follow high‑voltage safety operation procedures for CT and VT secondary circuit operations.
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