Technical Specifications Multi‑channel analog current‑voltage input, binary status input channels, relay output contacts. Multiple standard communication interfaces. Auxiliary DC operating power supply. Operating temperature ‑25 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Integrated fault disturbance recording and event log storage.
Functional Features Real‑time sampling of feeder secondary current and voltage values. Executes over‑current protection, earth‑fault protection, phase unbalance protection and other feeder protection functions. Outputs contact commands for circuit‑breaker tripping and closing. Supports local parameter configuration and status indication on front panel. Uploads measured data, protection action records and fault waveforms to upper substation monitoring system. Front‑panel LED indicators display device running status, protection activation and fault alarm. Built‑in comprehensive self‑diagnosis detects analog channels, binary I/O and internal hardware circuit abnormalities.
Application Scenarios Spare feeder protection IED for medium‑voltage distribution substation. Applied in industrial power plant and utility distribution cabinet maintenance and retrofitting projects.
Performance Parameters Fast protection action response speed. High‑precision electrical quantity measurement performance. Stable long‑term event and fault waveform storage capability.
Material Composition Metal reinforced housing for substation environment. Internal main processing board, analog sampling board, binary input‑output board and local human‑machine interface assembly. Rear‑side screw‑type wiring terminals for secondary signals, power supply and communication cables.
Structural Characteristics Standard cabinet panel embedded mounting structure. Front panel integrates display screen, operation keys and multi‑group status LED indicators. Rear section arranges multi‑group secondary wiring terminals for field connection.
Working Principle Protection logic cycles in real‑time. Measurement data, action events and disturbance records are transmitted to upper monitoring system via communication ports.
Installation Requirements Complete CT‑VT secondary wiring, binary input‑output wiring, power supply and communication wiring strictly according to engineering drawings. Restore auxiliary power supply, download protection setting parameters, verify measurement reading, protection logic execution and remote data upload function.
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