Description
The ABB REX010 (HESG324426R0001 / HESG324389) is a specialized injection unit used in conjunction with the REG670 or REG650 protection relays to provide comprehensive rotor ground fault protection. By injecting a low-frequency AC voltage into the rotor circuit, the REX010 allows the system to monitor the insulation resistance of the generator’s rotor. This “injection principle” ensures that ground faults are detected even when the generator is at a standstill or running at low speeds, providing 100% coverage of the rotor winding.
Product Specifications
- Model Identification: ABB REX010 (Part Number: HESG324426R0001 / HESG324389)
- Function: Injection unit for rotor and stator ground fault protection
- Injection Frequency: Typically 15 Hz or 20 Hz (system dependent)
- Coupling Capacitor: Requires external coupling (SIM00 or similar) for high-voltage isolation
- Communication: Interfaced directly with ABB IED 670/650 series protection relays
- Power Supply: Derived from the protection system or external 24V DC
- Dimensions: 160 mm x 100 mm x 225 mm
- Weight: 1.45 kg
- Country of Origin: Sweden / Switzerland
ABB REX010 HESG324426R0001 HESG324389
ABB REX010 HESG324426R0001 HESG324389
ABB REX010 HESG324426R0001 HESG324389
Application Fields
The ABB REX010 is a critical safety component for large-scale power generation infrastructure:
- Hydroelectric Plants: Protecting synchronous generators from rotor insulation failure due to moisture or mechanical stress.
- Thermal Power Stations: Monitoring large steam turbine generators for earth faults in the excitation circuit.
- Nuclear Power Generation: Ensuring high-reliability rotor monitoring as part of a redundant protection scheme.
- Gas Turbine Plants: Continuous monitoring of the rotor circuit during rapid start-up cycles.
- Pumped Storage Units: Providing ground fault detection across a wide range of operating frequencies and speeds.
Product Operation Instructions
- Mounting: The REX010 should be mounted in a standard protection cubicle, ideally close to the REG670/650 relay to minimize wiring distance for the injection signal.
- Circuit Connection: The unit is connected to the rotor circuit via a coupling capacitor unit (such as the RIM600 or SIM00). This is essential to block the DC excitation voltage from entering the injection electronics.
- Grounding: Ensure the unit has a low-impedance connection to the station’s functional ground. Proper grounding is vital for the accuracy of the resistance measurement.
- Relay Configuration: Within the REG670 configuration software (PCM600), enable the “Rotor Earth Fault” function block. Calibrate the injection signal to account for the natural capacitance of the rotor.
- Safety Check: High voltages are present in the excitation circuit. Never perform maintenance on the REX010 or its coupling units while the generator is excited without following strict electrical safety lockout/tagout procedures.
Q&A: Common Questions
Q: Why is an injection unit like the REX010 necessary if I already have a standard relay? A: Standard relays often depend on the voltage produced by the fault itself. The REX010 actively “searches” for faults by injecting its own signal, allowing it to detect insulation degradation even when the generator is stopped or the excitation is off.
Q: What is the difference between HESG324426R0001 and HESG324389? A: HESG324426R0001 is the primary orderable assembly number, while HESG324389 often refers to the sub-component or internal PCB assembly. They are generally treated as the same functional unit in spare parts procurement.
Q: Can this unit detect faults in the stator as well? A: While primarily known for rotor protection, the REX010 can be configured in some schemes to provide 100% stator ground fault protection using the same sub-harmonic injection principle.
Similar Model Recommendations
- ABB REG670 | 1MRK002812-AC
- ABB REX011 | HESG324426R0002
- ABB RIM600 | 1MRK002133-AA
- ABB SIM00 | HESG448834R0001
- ABB COMBIFLEX RXTTE 4 | RK421215-AB
