Technical Specifications Order‑configured analog current‑voltage input channels, binary input ports, 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 fault disturbance recording storage.
Functional Features Continuously samples bay secondary current and voltage signals. Executes configurable over‑current, earth‑fault and voltage‑related protection logic. Outputs relay contact signals for circuit‑breaker trip‑close operation and interlock control. Supports local parameter viewing and modification via front‑panel HMI. Uploads measurement data, protection action events and fault waveform records to upper SCADA monitoring system. Front‑panel LED indicators display device running status, protection activation and fault alarm. Built‑in hardware self‑diagnosis monitors analog sampling channels, binary I/O and internal circuit working condition.
Application Scenarios Spare bay‑level multifunction protection IED for medium‑voltage industrial and utility substation. Applied in power distribution secondary cabinet overhaul and equipment replacement.
Performance Parameters Stable protection logic cyclic operation performance. High‑precision electrical quantity measurement capability. Reliable local fault‑event storage characteristic.
Material Composition Metal substation‑resistant housing. Internal main processing board, analog sampling assembly, binary input‑output module and front‑panel human‑machine interface unit. Rear‑side screw‑type wiring terminals for field secondary circuit connection.
Structural Characteristics Cabinet‑panel embedded mounting structure. Front side equipped with display screen, operation keys and multi‑group status LED indicators. Rear side arranges multi‑group secondary wiring terminals for signal, power and communication connection.
Working Principle After power‑on initialization and self‑check, REX521GHHPSH06G cyclically acquires bay secondary analog and binary signals. Protection and interlock control logic run continuously. Measurement and fault‑event information are transmitted to upper‑level system through communication ports.
Installation Requirements Restore auxiliary power supply, download matching setting parameter files, verify measurement reading, protection‑interlock logic and remote data upload function.
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