GE URRHH Universal Relay Redundant Power Supply – SIL3 Ready

The GE URRHH is a redundant power supply module engineered by GE Vernova (formerly GE Grid Solutions) for the Universal Relay (UR) family of intelligent electronic devices (IEDs), including models such as UR8CH, UR6AH, and UR7. It provides dual-input, fault-tolerant power delivery to ensure uninterrupted operation of protection relays in mission-critical transmission, distribution, and industrial power systems.

Designed for high availability and safety compliance, the URRHH supports hot-swap capability, wide input voltage ranges, and real-time health monitoring—making it essential for SIL3-certified applications and digital substation deployments where power continuity is non-negotiable

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Application Scenarios

At a 765 kV transmission substation in the Midwest U.S., a single-point power failure on a legacy relay caused a complete loss of line differential protection during a severe thunderstorm—leading to an unnecessary cascade trip. To eliminate this vulnerability, engineers retrofitted all GE UR8CH relays with GE URRHH redundant power modules. During a subsequent grid disturbance involving a lightning-induced station blackout on one DC bus, the URRHH seamlessly switched to the secondary power source within <10 ms, with zero interruption to protection logic or GOOSE communication. Operators later confirmed via the relay’s diagnostics that the URRHH had logged the switchover event, including input voltage levels and load current—enabling full forensic analysis. This incident demonstrated how the URRHH transforms power from a passive utility into an active layer of system resilience.

Technical Principles and Innovative Values

Innovation Point 1: True 1+1 Hot-Standby Redundancy

The URRHH employs dual isolated power converters that operate in parallel, with continuous cross-monitoring. If one input fails or sags below threshold, the other assumes full load instantly—ensuring zero dropout for the UR relay’s critical functions.

Innovation Point 2: Seamless Integration with UR Diagnostics

Unlike generic PSUs, the URRHH reports real-time metrics (input voltage, output current, fault flags) directly to the UR relay’s HMI and Enervista software—enabling predictive maintenance and audit-ready logs.

Innovation Point 3: Wide Universal Input Compatibility

Supporting both AC and DC from 24 V to 250 V, the URRHH eliminates the need for site-specific power adapters—ideal for global deployments across utilities with varying auxiliary standards.

Innovation Point 4: SIL3 System Enablement

When paired with SIL3-certified UR relays like UR8CH, the URRHH’s fault coverage and diagnostic capabilities contribute to the overall safety integrity of the protection function—validated via FMEDA analysis.

Application Cases and Industry Value

In a hydroelectric generation complex in Canada, seasonal ice buildup occasionally caused intermittent grounding on the 125 V DC station battery system. Legacy relays would reboot during brief sags, losing fault records. After installing GE URRHH modules on all UR6AH generator protection relays, the system maintained continuous operation through multiple winter outages. During a turbine overspeed event, the URRHH ensured the UR6AH executed a clean trip sequence and preserved the full COMTRADE file—even as primary DC voltage collapsed to 80 V. Plant engineers credited the URRHH with preventing a potential mechanical failure, estimating avoided downtime at over $ 500.000. Regulatory auditors highlighted the power redundancy as a best practice for critical generation assets.

Installation, Maintenance, and Full-Cycle Support

Installing the GE URRHH is straightforward: insert the module into the designated slot in the UR relay chassis, connect two independent power sources (e.g., Station Battery A and B), and verify LED status (green = healthy, red = fault). No configuration is needed—the UR relay auto-detects the URRHH and begins monitoring its health.

For maintenance, the URRHH’s front-panel LEDs provide immediate visual indication of active source and faults. In redundant systems, failed units can be replaced live—critical for NERC-compliant transmission sites. As an authorized GE Vernova partner, we supply only genuine URRHH modules, each tested for:

Switchover time (<10 ms under full load)

Output ripple (<50 mVpp)

Overload and short-circuit protection

Thermal performance at 70°C ambient

We provide full lifecycle support—including compatibility validation, obsolescence alerts, and rapid exchange for critical spares in grid operations.

Contact us for a customized solution—whether you’re hardening an existing UR fleet against power vulnerabilities, commissioning a new digital substation, or achieving SIL3 compliance, the GE URRHH delivers unmatched power resilience, intelligence, and peace of mind for the world’s most critical electrical infrastructure.