Technical Specifications Multi‑winding analog current‑voltage input channels, binary status input ports, multi‑group relay trip and control 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%. Large‑capacity fault disturbance recording and event‑log storage.
Functional Features Real‑time sampling of multi‑winding transformer secondary current and voltage signals. Executes differential protection, over‑current protection, over‑voltage protection and other transformer‑oriented main and backup protection logic. Outputs multi‑group relay trip and control contact commands for transformer bay switchgear. Supports local parameter configuration and status monitoring via front‑panel HMI. Uploads measurement data, protection action events and fault waveform records to upper substation monitoring system. Front‑panel LED indicators display device running, protection activation and fault alarm state. Built‑in comprehensive hardware self‑diagnosis monitors multi‑group analog sampling channels, binary I/O and internal circuit condition.
Application Scenarios Spare transformer protection IED for power plant and utility substation transformer bay. Applied in power system transformer protection cabinet maintenance and renovation projects.
Performance Parameters High‑precision transformer differential‑protection calculation performance. Fast main‑protection action response speed. Complete multi‑winding fault‑waveform recording capability.
Material Composition Metal substation‑grade reinforced housing. Internal main processing board, multi‑channel analog sampling board, binary input‑output assembly and front‑panel human‑machine interface unit. Rear‑side multi‑group screw‑type wiring terminals for secondary signals, power supply and communication cables.
Structural Characteristics Standard cabinet‑panel embedded mounting structure. Front side integrates display screen, operation keys and abundant status LED indicators. Rear section arranges large‑quantity secondary wiring terminals for multi‑winding signal connection.
Working Principle After power‑on self‑diagnosis completes, RET650 collects multi‑winding transformer secondary current and voltage signals cyclically. Transformer differential and backup‑protection logic run continuously.
Installation Requirements Restore auxiliary power supply, download transformer protection setting parameters, verify multi‑winding measurement reading, differential‑protection logic and remote data upload function.
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