Technical Specifications Analog current‑voltage input channels, binary signal input ports, relay output contacts. Multiple communication interfaces. Auxiliary DC working power supply. Operating temperature ‑25 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Built‑in fault event and disturbance recording function.
Functional Features Real‑time sampling of feeder current and voltage secondary signals. Executes over‑current, earth‑fault and other feeder protection algorithms. Operates output relay contacts to complete trip function when fault occurs. Supports local parameter setting and status indication. Uploads measurement data, protection action events and fault records to upper monitoring system. Front‑panel LED indicators reflect device running, protection trigger and fault alarm state. Built‑in hardware self‑diagnosis detects sampling channel, output contact and internal circuit abnormality.
Application Scenarios Spare feeder protection IED for medium‑voltage distribution substation. Applied in industrial plant power distribution cabinet maintenance and renovation.
Performance Parameters Fast feeder protection action response. 
Material Composition Metal panel‑mount housing. Internal main processing unit, analog sampling board, binary input‑output board and human‑machine interaction assembly. Rear‑side screw wiring terminals for secondary signal, power and communication.
Structural Characteristics Standard cabinet‑panel embedded installation structure. Front side equipped with display unit, operation keys and multi‑group status LED indicators. Rear side arranged with multi‑group secondary wiring terminals.
Working Principle After power‑on initialization, REF541KB115AAAA continuously samples feeder secondary current and voltage signals. Protection logic operates cyclically. Once fault condition meets setting value, trip relay contact acts.
Installation Requirements Complete secondary current‑voltage wiring, binary input‑output wiring, power and communication wiring according to engineering drawing. Restore auxiliary power supply, download protection setting parameters, verify measurement reading, protection logic action and data upload function.
Usage Notes Avoid open‑circuit of current transformer secondary loop during installation. Hot‑plug under powered condition is prohibited. Protection setting value shall be verified after commissioning.
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