GENERAL ELECTRIC UR8AH RELAY MODULE

GENERAL ELECTRIC UR8AH RELAY MODULE

Feature

8 Current Inputs: 1 A / 5 A self-selecting, 20 A continuous, 100 A 1 s thermal; 4 voltage inputs 67-300 V AC; ±0.2 % accuracy, 256 samples/cycle, 4 ms response.
Wide-Range Temp: –40…+85 °C operation, –55…+85 °C storage; conformal-coated PCB for offshore rigs & desert solar plants.
High Isolation: 2 kV channel-to-ground, 1 kV channel-to-channel; prevents ground loops in mixed AC/DC panels.
Enhanced Diagnostics: on-board CT-open, CT-short, ADC-health & gain-drift checks; alarms via LCD & EnerVista UR for predictive maintenance.
Hot-Swap Plug-In: 160 × 100 × 25 mm, 0.53 kg; slides into any UR 6U chassis, auto-configured <5 s, no re-calibration needed.
Global Certs: CE, UL, ATEX II 2 G Ex ia IIC T4 Gb, IECEx, SIL 2 / PL-d rated; meets IEEE C37.90 & IEC 61850-9-2LE.

Application

Generator differential & REF: 8 CT cores measure stator, neutral and earthing-resistor currents; 2nd-5th harmonic restraint blocks inrush, trips in <10 ms on 500 MW steam-turbine sets.
Busbar zone protection: multi-module stack samples up to 24 CTs; distributed GOOSE blocking achieves 2 ms bus differential on 132 kV GIS.
Offshore platform feeder: 4 VT inputs track 33 kV line voltage dip, 4-20 mA output drives DCS for FRT compliance during grid disturbances.
Industrial CHP genset: 1 A CTs on 4 kV switchgear feed UR8AH for 50/51/51G/81/27/59 protection; Modbus TCP uploads kW & power-factor to plant SCADA.
Retrofit legacy UR-1H/UR-RH modules: identical slot & wiring footprint allows 15 % higher isolation upgrade without changing chassis—ideal for 20-year-old turbine control cubicles undergoing SIL-rated refurbishment.

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