GENERAL ELECTRIC UR8GH PLC module

GENERAL ELECTRIC UR8GH PLC module

Feature

8 CT Inputs: 1 A / 5 A self-adapting, 20 A continuous, 100 A 1 s thermal; 8 VT inputs 67-300 V AC; ±0.2 % accuracy, 256 samples/cycle, 4 ms response.
Gen-Diff 87G: built-in 3rd-gen DSP delivers 2nd-5th harmonic restraint, IEEE C37.234 synchrophasor, trips in <10 ms.
Enhanced Diagnostics: CT/VT open-short, ADC health, gain drift check; alarms on LCD & EnerVista UR for predictive maintenance.
Galvanic Isolation: 2 kV channel-to-ground, 1 kV ch-ch; eliminates ground loops in mixed AC/DC panels.
Hot-Swap Module: 150 × 180 × 40 mm, 1.13 kg, IP52; slide-in UR rack, auto-config <5 s, no re-cal needed.
Wide-Range Temp: –40…+70 °C operation, –55…+85 °C storage, 0-95 % RH; conformal-coated for desert & offshore rigs.

Application

Large steam-turbine generator: 8 CT cores measure stator, neutral and earthing-resistor currents; 87G/87N elements trip field breaker on internal fault <10 ms.
Nuclear unit busbar protection: multi-module stack samples 24 CTs; distributed GOOSE blocking achieves 2 ms bus differential on 6.6 kV safety bus.
Offshore wind farm collector: VT inputs track 33 kV feeder voltage dip, PMU data streamed to SCADA for grid-code FRT verification.
Pumped-storage motor-generator: CT inputs detect pump-mode locked-rotor, VT inputs monitor back-to-back start voltage; SIL 2 trip inhibits 300 MW unit safely.
Industrial CHP genset: 1 A CTs on 4 kV switchgear feed UR8GH for 50/51/51G/81/27/59 protection; 4-20 mA output drives plant DCS for kW and power-factor trending.

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