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) |
Technical Principles and Innovative Values
Innovation Point 1: Intelligent Self-Test and Health Monitoring
The GE URRHH performs periodic major and minor self-tests to evaluate hardware integrity. If a critical fault is detected (e.g., internal fuse failure or output voltage deviation), the module can de-energize itself and signal an alert via panel LEDs. This proactive fault detection saves hours of troubleshooting and prevents catastrophic system downtime—a feature absent in generic third-party power supplies .
Innovation Point 2: Dual Voltage Range Flexibility
Unlike single-range power supplies, the GE URRHH offers both High Range (125–250V AC/DC) and Low Range (24–48V DC) configurations. This enables seamless deployment across global power standards—from North American 110V AC substations to European 220V DC industrial plants—without hardware modifications .
Innovation Point 3: True Redundancy with Diode-Isolated Outputs
In redundant configuration, two GE URRHH modules can be paralleled using internal diode isolation. When the primary module fails or is removed for maintenance, the secondary module instantly takes over the load with zero voltage dip. This “hot-standby” architecture is a critical requirement for NERC/CIP and China Grid “anti-accident” compliance, ensuring protection systems never lose power .
Innovation Point 4: Built-in PLC-Level Control Capability
Beyond power conversion, the GE URRHH integrates a QNX Neutrino-based real-time platform, allowing it to execute complex logic control (e.g., temperature/level PID loops) directly within the power supply module. This reduces the need for separate PLCs in compact control cabinets .
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