Product Short Description
Product Description
The ABB REX010 is a dedicated earth fault protection injection unit engineered to work in conjunction with ABB’s REG216 and REG316*4 numerical generator protection relays. It delivers 100% stator and rotor earth fault protection for generators across all operating states—standstill, run-up, and normal operation. Operating on the offset voltage method with low-frequency signal injection, it continuously monitors insulation resistance and calculates earth fault resistance, ensuring comprehensive safety for medium- and high-voltage generator systems in power plants and critical industrial facilities.
Description
Technical Specifications
| Category | Details |
|---|---|
| Design & Mounting | Integrates into REG3164 housing; compatible with REG216/REG3164 systems |
| Power Supply | Auxiliary DC: 36 V DC to 312 V DC (station battery) |
| Optocoupler Inputs | 18 V DC to 312 V DC (configurable: 18–36 V DC, 36–75 V DC, 82–312 V DC) |
| Signal Injection | Coded square wave signals at fN/4 (frequency: 50 Hz or 60 Hz) |
| Connection Terminals | HDFK (Phoenix type), 4 mm²; REX011 transformer: 5 mm² (UK5) / 50 mm² (UHV50) |
| Operating Temperature | -20 °C to +55 °C |
| Storage Temperature | -40 °C to +85 °C |
| Housing Protection | IP65 (environmental robustness) |
| Dimensions | 1.3 cm × 25.4 cm × 20.3 cm (H × W × D) |
| Weight | 0.5 kg |
| Power Consumption | <180 VA |
| Measurement Accuracy | Earth fault resistance: ±10% (100 Ω–10 kΩ); ±20% (0–100 Ω, 10 kΩ–20 kΩ) |
Core Functions & Features
1. 100% Stator & Rotor Earth Fault Protection
- Dual Coverage: Combines 100% stator earth fault protection (calculating earth resistance) and 95% stator overvoltage protection, ensuring overlapping redundancy for full stator winding safety.
- Rotor Protection: Dedicated function for rotor earth faults, including measurement of coupling capacitance for optimal settings during standstill.
- All-State Operation: Active during generator standstill, startup, run-down, and full-load conditions, eliminating protection gaps.
2. Advanced Signal Injection & Supervision
- Offset Voltage Method: Injects coded square wave signals (fN/4) to generate offset voltage, enabling precise calculation of earth fault resistance (Rf).
- Continuous Self-Supervision: Monitors injection signal amplitude and frequency in real time, validating signal integrity and system health.
- Insulation Monitoring: Tracks insulation resistance and primary earthing system status, providing early warning of degradation.
3. Control & Indications
- Local Control: ENABLE/DISABLE switches and RESET pushbutton for manual operation.
- Visual Indicators: Green (device ready), red (overload), yellow (no injection/injection on) LEDs for clear status feedback.
- Trip Circuit Supervision: Integrates with REX011 transformer unit to protect against high voltages during terminal earth faults.
4. System Integration & Compatibility
- Perfect Match with REG216/REG316*4: Seamless integration with ABB’s flagship generator protection relays, forming a complete protection system.
- Flexible Earthing Configurations: Supports two separate earthing points within the protected zone and all common generator earthing/excitation systems (including thyristor types).
- Retrofit Friendly: Designed for easy upgrade of existing generator protection systems, minimizing downtime.
Application Scenarios
- Power Generating Plants: Primary protection for thermal, hydro, and gas turbines, ensuring 100% stator/rotor safety in utility-scale generators.
- Industrial Power Systems: Critical standby generators in data centers, refineries, and manufacturing facilities, preventing costly downtime from earth faults.
- Combined Cycle Plants: Protection for multi-unit generator systems with complex earthing arrangements.
- Wind & Solar Farms: Earth fault protection for doubly fed induction generators (DFIGs) and synchronous generators in renewable energy installations.
- Distributed Generation: Microgrids and islanded power systems, where reliable earth fault protection is essential for grid stability.
Unique Advantages
- Comprehensive Coverage: Eliminates blind spots in stator/rotor protection, ensuring 100% coverage of generator windings.
- High Reliability: Insensitive to external disturbances, maintaining accuracy in harsh industrial and utility environments.
- Easy Maintenance: Compact design, plug-in compatibility, and clear status indicators simplify testing and servicing.
- Future-Ready: Supports modern IEC 61850 communication protocols when integrated with REG216/REG316*4, enabling digital substation integration.
Order Code (HESG324426R0001) Summary
Defines:
- Hardware: REX010 injection unit with standard terminal connections.
- Power Supply: 36 V DC to 312 V DC auxiliary DC (station battery).
- Frequency: 50 Hz or 60 Hz (configurable via order code).
- Optocoupler Inputs: 18 V DC to 312 V DC (compatible with multiple input voltage ranges).
- Certifications: Complies with IEC 60255 and relevant utility standards for generator protection.
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