GE UR8HH Cybersecurity-Enhanced Multifunctional Power Relay

Description

The GE UR8HH operates as the high-range power supply module in the UR family’s modular chassis, residing at the base layer of substation automation stacks to convert incoming AC/DC sources into regulated rails (+5 V, +12 V, -12 V) that energize the relay’s processor, analog front-end, and digital I/O. It slots into the rear panel of UR enclosures, drawing from control house supplies via screw terminals, then distributes power through the internal bus to core modules like the CPU or CT/VT interfaces, incorporating DC-DC converters for isolation that prevents ground loops in multi-bay setups. In action, it auto-ranges inputs and monitors output stability, triggering a fail-safe shutdown if rails deviate beyond 5%, while coordinating with redundant supplies for seamless failover in under 10 ms—critical for maintaining protection continuity during faults.

This module aligns with UR’s expandable architecture, pairing with low-range units (like UR8LH) for hybrid redundancy or newer UR-SH variants for extended voltage tolerance, supporting self-diagnostics via front-panel LEDs and Modbus queries that log voltage trends for predictive alerts in EnerVista software. The GE UR8HH thrives in backplane systems, interfacing implicitly with IEC 61850 GOOSE for peer messaging or RS-485 for serial polling, and its low ripple (<50 mV) ensures crisp I/O signals amid noisy environments. Rated for harsh conditions, it endures vibration and humidity in outdoor cabinets, facilitating quick field swaps without reconfiguration. By anchoring power at the chassis core yet buffered from field surges, it streamlines the relay ecosystem—from basic metering to advanced bay control—freeing engineers to refine schemes like distance-to-fault logic rather than chasing supply gremlins.