Technical Specifications Secondary current‑voltage analog input channels, binary status input, relay output contacts. Multiple communication interfaces. Auxiliary DC operating power supply. Operating temperature ‑25 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Integrated event log and disturbance recording function.
Functional Features Continuously samples feeder secondary current and voltage signals. Executes over‑current protection, earth‑fault protection and voltage‑based protection logic. Outputs relay contact commands for circuit‑breaker trip and close. Supports local parameter configuration and status monitoring from front‑panel HMI. Transmits measured values, protection action events and fault waveform records to upper SCADA system. Front‑panel LED indicators display device running, protection trigger and fault alarm state. Built‑in comprehensive hardware self‑diagnosis monitors sampling channels, I/O modules and internal circuit working condition.
Application Scenarios Spare feeder protection IED for medium‑voltage utility and industrial substation. Used for secondary equipment overhaul and replacement.
Performance Parameters Fast protection response capability. Accurate electrical quantity measurement performance. Stable fault‑event storage characteristic.
Material Composition Metal substation‑grade housing. Internal main processing hardware, analog sampling unit, binary input‑output assembly and front‑panel HMI components. Rear‑side screw‑type wiring terminals for field secondary circuit connection.
Structural Characteristics Cabinet‑panel embedded mounting structure. Front side integrates display screen, operation keys and multi‑group status LED indicators. Rear section provides multi‑group secondary wiring terminals.
Working Principle After power‑on initialization and self‑diagnosis, REF615D collects analog and binary signals from secondary circuit. Protection logic cycles in real‑time. When fault condition matches setting parameters, output relays execute trip action.
Installation Requirements Complete CT‑VT wiring, binary I/O wiring, power supply and communication wiring strictly following engineering drawings. Restore auxiliary power, download protection setting files, verify measurement reading, protection logic and remote data upload performance.
Usage Notes Avoid current transformer secondary open‑circuit during installation work. Hot‑plug under powered condition is prohibited. Validate protection setting parameters after commissioning.
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