Technical Specifications Order‑defined 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%. Built‑in event log and fault disturbance recording storage.
Functional Features Continuously samples bay secondary current and voltage analog signals. Executes configurable bay‑level protection logic algorithms. Realizes circuit‑breaker trip‑close control and programmable hardware interlock function. Supports local parameter setting and status monitoring from front‑panel HMI. Transmits measurement data, protection action events and fault waveform records to upper SCADA system. Front‑panel LED indicators display device running, protection activation and fault alarm state. Built‑in comprehensive hardware self‑diagnosis monitors sampling channels, I/O modules and internal circuit working condition.
Application Scenarios Spare special‑variant bay protection IED for medium‑voltage industrial power distribution substation. Applied in secondary cabinet maintenance and equipment retrofitting.
Performance Parameters Stable cyclic protection‑logic operation performance. High‑precision electrical quantity measurement capability. Reliable fault‑event and waveform storage characteristic.
Material Composition Metal substation‑resistant housing. Internal main processing hardware, analog sampling unit, binary input‑output assembly and front‑panel HMI components. Rear‑side screw‑type wiring terminals for field secondary circuit connection.
Structural Characteristics Cabinet‑panel embedded mounting structure. Front side integrates display screen, operation keys and multi‑group status LED indicators. Rear section provides multi‑group secondary wiring terminals for field connection.
Working Principle After power‑on initialization and self‑check, REX521GHHPSH50G collects analog and binary signals from secondary circuit cyclically. Protection and interlock logic run in real‑time. When fault condition matches setting parameters, output relays execute trip action. Measurement data and fault records are uploaded through communication interfaces.
Installation Requirements Restore auxiliary power supply, download corresponding setting files, verify measurement reading, protection‑interlock logic and remote data upload performance.
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