Technical Specifications Analog current‑voltage input channels, binary input and relay output contacts. Multi‑protocol communication interfaces. Auxiliary DC operating power supply. Operating temperature ‑25 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Built‑in event log and fault disturbance recording storage.
Functional Features Real‑time acquisition of feeder secondary current and voltage signals. Executes configurable over‑current, earth‑fault and voltage protection functions. Outputs relay contact signals for circuit‑breaker trip‑close control. Supports local parameter viewing and modification via front‑panel HMI. Uploads measurement data, protection action events and fault waveforms to upper monitoring system. Front‑panel LED indicators reflect device running, protection activation and fault alarm status. Built‑in self‑diagnosis detects hardware channel and internal circuit abnormality.
Application Scenarios Spare numerical feeder protection device for medium‑voltage substation. Applied in industrial plant power distribution secondary equipment maintenance.
Performance Parameters Stable protection logic response performance. High‑precision electrical measurement capability. Reliable fault‑data storage function.
Material Composition Metal substation‑resistant housing. Internal main processing board, analog sampling board, binary I/O board and front‑panel human‑machine interface. Rear‑side screw‑type wiring terminals for field secondary connection.
Structural Characteristics Standard cabinet‑panel embedded mounting structure. Front side fitted with display unit, operation keys and status LED indicators. Rear side arranged with multi‑group secondary wiring terminals.
Working Principle After power‑on self‑check, REF615C‑D samples secondary analog and binary signals cyclically. Protection algorithm runs continuously. Once fault condition satisfies setting values, trip relay contacts act. Measurement and fault‑event data are transmitted to upper‑level system via communication channels.
Installation Requirements Complete CT‑VT secondary wiring, binary I/O wiring, power supply and communication wiring according to drawings. Restore auxiliary power, download protection setting parameters, verify measurement reading, protection action and remote data upload function.
Usage Notes Forbid CT secondary loop open‑circuit during wiring operation. Hot‑plug under powered condition is prohibited. Complete protection setting verification after commissioning.
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