Technical Specifications Secondary current analog input channels, binary status input ports, relay trip and signal output contacts. 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 storage.
Functional Features Samples feeder secondary current signals continuously. Executes configurable over‑current and earth‑fault protection logic with multiple time‑delay characteristics. Outputs relay contact trip command for circuit‑breaker protection action. Front‑panel HMI supports local parameter setting and status browsing. Front‑panel LED indicators display device running, protection activation and fault alarm. Built‑in hardware self‑diagnosis detects internal circuit abnormality.
Application Scenarios Spare feeder over‑current and earth‑fault protection relay for medium‑voltage distribution substation. Applied in utility and industrial power distribution secondary cabinet maintenance.
Performance Parameters Reliable over‑current and earth‑fault protection action performance. Accurate current measurement capability. Stable local fault‑event log storage characteristic.
Material Composition Metal substation‑resistant housing. Internal signal sampling board, logic processing unit and front‑panel human‑machine interface assembly. Rear‑side screw‑type wiring terminals for secondary signal and power‑supply connection.
Structural Characteristics Standard cabinet‑panel embedded mounting structure. Front side equipped with operation keys and status LED indicators. Rear side arranges multi‑group secondary wiring terminals for CT input, binary I/O and power supply.
Working Principle After power‑on self‑check, SPAJ110C cyclically samples secondary current signals from current transformers. Protection logic runs continuously. When current value exceeds setting threshold, corresponding time‑delay counting starts. After time‑delay condition satisfies, trip relay contacts execute protection action. Fault‑event information is stored inside device.
Installation Requirements Mount device onto cabinet panel and tighten mounting screws. Complete CT secondary wiring, binary I/O wiring and auxiliary power‑supply wiring strictly following engineering drawings. Restore auxiliary power supply, download protection setting parameters, verify protection logic action function.
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