Technical Specifications Configurable analog current‑voltage input channels, binary status input ports, relay output contacts. Multi‑protocol communication interfaces. Auxiliary DC operating power supply. Operating temperature ‑25 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. On‑board event log and fault waveform storage capacity.
Functional Features Real‑time sampling of bay secondary current and voltage signals. Executes configurable over‑current, earth‑fault and voltage protection algorithm logic. Drives relay contacts for circuit‑breaker trip‑close and interlock control. Supports local parameter configuration and status browsing via front‑panel HMI. Uploads measured values, protection action events and disturbance records to upper monitoring system. Front‑panel LED indicators reflect device running, protection trigger and fault alarm status. Built‑in hardware self‑diagnosis detects analog channels, binary I/O and internal circuit abnormalities.
Application Scenarios Spare configured bay‑level protection IED for medium‑voltage substation feeder bay. Used for industrial power distribution secondary equipment maintenance and replacement projects.
Performance Parameters Reliable protection action response performance. Accurate electrical measurement capability. Stable local fault‑data storage function.
Material Composition Metal substation‑grade 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 secondary signals, power supply and communication cables.
Structural Characteristics Cabinet‑panel embedded installation structure. Front side equipped with display screen, operation keys and multi‑group status LED indicators. Rear side arranges multi‑group field secondary wiring terminals.
Working Principle After power‑on self‑diagnosis completes, REX521GHHPSH07G cyclically samples secondary analog and binary signals. Protection and interlock logic run continuously. When fault condition meets setting values, output relays perform trip action. Measurement and fault‑event information are transmitted to upper‑level system through communication ports.
Installation Requirements Complete CT‑VT secondary wiring, binary I/O wiring, power supply and communication wiring according to engineering drawings.
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