Application Scenarios
In a 500kV substation in Eastern China, the protection relay panels were experiencing intermittent resets during summer peak loads—a symptom traced to unstable DC supply from aging power modules. The engineering team replaced the faulty units with dual GE URRHH modules in redundant configuration. The result? Zero protection dropouts during subsequent voltage sags, and a 100% improvement in system availability. This real-world case highlights the critical role the GE URRHH plays in maintaining grid stability, especially in high-voltage environments where power fluctuations are common and relay malfunctions are not an option .
The GE URRHH is equally vital in gas-fired combined-cycle plants, where it powers the GE EX2000/EX2100 excitation system control boards (KLD, SDCC), ensuring stable generator voltage regulation. It is also deployed in industrial motor control centers (MCCs), transformer protection panels, and renewable energy inverter stations, addressing the pain points of power supply inconsistency, module aging, and lack of diagnostic visibility .
Technical Parameters
| Parameter | Value / Description |
|---|---|
| Product Model | GE URRHH (also UR-RHH) |
| Manufacturer | GE Multilin / GE Grid Solutions |
| Product Category | Power Supply Module for UR Series Relays |
| Input Voltage (High Range – HI) | 125–250 V AC/DC (nominal) |
| Input Voltage (Low Range – LO) | 24–48 V DC (nominal) |
| Output Power | Approx. 35 W (sufficient for full relay configuration) |
| Internal Fuse Rating | 4A / 250V (provides short-circuit protection) |
| Self-Diagnostics | Built-in major/minor health tests with LED status indication |
| Operating Temperature | –40°C to +70°C (meets outdoor substation requirements) |
| Redundant Operation | Supports dual power supply configuration (hot-standby) |
| Isolation Voltage | Up to 2300V AC (ensures signal/input isolation safety) |
| Dimensions (approx.) | 6.5″ × 6.5″ × 1.75″ (165 × 165 × 44 mm) |
| Weight | Approx. 1.2 kg |
| Mounting | Plug-in installation within UR Series chassis (backplane connection) |
| Certifications | CE, UL, CSA, IEC 60255-27 (relay standard compliance) |
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