Technical Specifications Multi‑level over‑current and earth‑fault protection function. Analog input for current and voltage signals. Binary input and binary output channels for status acquisition and control output. Multiple communication protocol support. Auxiliary power supply 80‑250 V DC / 85‑265 V AC. Typical power consumption 11.2 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 Provides instantaneous and time‑delay over‑current, directional earth‑fault protection for distribution feeder. Realizes measurement of current, voltage and power parameters. Collects circuit‑breaker auxiliary contact signal, supports local and remote switch control. Stores fault event and disturbance recording data. Front‑panel HMI realizes local status check and parameter configuration. LED indicators reflect power, running, trip and alarm state. Built‑in hardware self‑diagnosis monitors internal operating condition.
Application Scenarios Installed inside medium‑voltage switchgear cabinet. Used for feeder protection and control of power utility substation and industrial enterprise power distribution system. Applies to medium‑voltage distribution project requiring customized channel definition.
Performance Parameters Protection action speed meets medium‑voltage distribution network requirement. Disturbance recorder captures fault transient waveform. Event log records time‑stamped fault sequence. Self‑diagnosis triggers alarm for internal hardware abnormality. Measurement accuracy satisfies distribution monitoring requirement.
Installation Requirements Secure unit inside medium‑voltage switchgear cabinet. Connect auxiliary power supply within rated voltage range. Wire CT, VT, binary input‑output circuits strictly following engineering schematic diagram. Connect communication cable for remote monitoring when necessary. Download protection setting and application configuration by supporting engineering software. Complete protective grounding complying with power industry specification. Inspect front‑panel LED working status after power‑on.
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