REX010 ABB Generator Stator Ground Fault Protection
Manufacturer: ABB
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Part Number: REX010
Condition：New with Original Package
Product Type: Earth Fault Protection
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Country of Origin: Sweden
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Product Overview
The ABB REX010 serves as a specialized injection and measurement unit designed to detect earth faults in the stators and rotors of large synchronous generators. By providing active measurement signals, it ensures comprehensive protection even when the generator remains at a standstill or is in the startup phase. We supply this unit as 100% Brand New and Original, enabling your facility to reach 100% stator and rotor ground fault coverage when integrated with ABB REG216 or REG316 protection relays.
Technical Specifications
The REX010 features high-accuracy sensing and a ruggedized enclosure for power generation environments:
| Feature | Specification |
| Model | REX010 |
| Compatibility | ABB REG216 / REG316 Relays |
| Voltage Range | 277 / 480 V AC |
| Current Range | 5 A – 2000 A |
| Detection Accuracy | ±2% |
| System Frequency | 50 / 60 Hz |
| Protection Class | IP65 |
| Operating Temp | –20 °C to +55 °C |
| Dimensions | 25.4 × 20.3 × 1.3 cm |
| Weight | 0.5 kg |
| Origin | Switzerland |
Engineering Advantages
The REX010 addresses the technical limitations of standard passive protection relays:
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Active Injection Protection: Unlike passive relays that require voltage generation to detect faults, the REX010 injects a sub-harmonic signal into the winding circuit. This method protects the generator across all states—static, startup, and running—preventing catastrophic damage during initial power-up.
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100% Stator Coverage: Standard protection often leaves a "blind spot" near the generator neutral point. The REX010 eliminates this gap, providing full 100% coverage of the stator winding and protecting against high-impedance earth faults that would otherwise go undetected.
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Environmental Sealing (IP65): The IP65-rated housing protects the internal measurement circuitry from coal dust, oil mist, and humidity. This durability makes the REX010 ideal for installation in turbine halls and petrochemical processing zones where atmospheric contaminants are prevalent.
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High-Precision Fault Location: With an accuracy of ±2% across a massive current range (up to 2000 A), the unit distinguishes between harmless capacitive leakage and genuine insulation breakdown. This precision prevents nuisance trips while ensuring rapid isolation during actual fault events.
FAQs
Q: Does the REX010 operate independently or does it require a relay?
A: The REX010 functions as a specialized interface unit. It works in conjunction with ABB REG216 or REG316 series protection relays. The REX010 performs the signal injection and measurement, while the relay processes the data and executes the trip command.
Q: Can the REX010 protect both the stator and the rotor?
A: Yes. When properly configured within the ABB protection scheme, the REX010 provides the necessary signal processing to monitor both stator and rotor insulation integrity, ensuring the entire generator core remains protected against ground faults.
Q: Is this unit suitable for retrofit projects in older power plants?
A: Absolutely. The REX010 features a compact design that fits easily into existing protection racks. It provides a modern upgrade path for facilities looking to improve generator safety and meet current insurance or regulatory standards for 100% ground fault coverage.
Q: What maintenance does the REX010 require?
A: The unit is solid-state and requires no periodic calibration. We recommend regular visual inspections of the terminal connections and the IP65 seal integrity during scheduled plant outages to maintain optimal electrical contact.