Technical Specifications Configurable analog current‑voltage input channels, binary status 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%. Built‑in event log and fault disturbance recording storage.
Functional Features Real‑time sampling of bay secondary current and voltage signals. Executes configurable bay‑level protection algorithm logic. Realizes circuit‑breaker trip‑close control and hardware interlock function. Supports local parameter setting and status browsing via front‑panel HMI. Uploads measurement data, protection action events and fault records to upper SCADA monitoring system. Front‑panel LED indicators reflect device running, protection trigger and fault alarm condition.
Application Scenarios Spare bay‑level multifunction protection and control IED for medium‑voltage substation. Applied in industrial and utility power distribution secondary cabinet maintenance.
Performance Parameters Stable protection‑logic operation performance. Accurate electrical quantity measurement capability. Reliable local event‑record storage function.
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.
Working Principle After power‑on initialization and self‑check, REX521GHHGSH05G cyclically acquires bay secondary analog and binary signals. Protection and control logic run continuously. When fault condition meets setting values, protection‑related output relays act. Measurement and fault‑event information are transmitted to upper‑level system through communication ports.
Installation Requirements Restore auxiliary power supply, download matching setting parameters, verify measurement reading, protection‑control logic and remote data upload function.
Usage Notes Prevent current transformer secondary open‑circuit during wiring work. Hot‑plug under powered state is prohibited. Verify bay‑level protection and interlock setting after commissioning.
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