Description
Woodward BUM60-12/240013-G003-0000
Technical Specifications
- System Type: Brushless, rotating excitation system.
- Voltage Rating: Optimized for medium-voltage synchronous generators.
- Excitation Output: High-capacity DC output tailored to specific generator field requirements.
- Regulation Accuracy: High-precision automatic voltage regulator (AVR) integration.
- Cooling Method: Self-ventilated or forced-air cooled depending on generator enclosure.
Functional Features
- Brushless Design: Eliminates maintenance-intensive carbon brushes and slip rings, significantly reducing operational downtime.
- Fast Response: Rapid excitation response to maintain terminal voltage during sudden load changes or grid faults.
- Over-Excitation Protection: Built-in limiters to protect the rotor winding from thermal damage during sustained over-excitation.
- Under-Voltage Protection: Prevents generator operation in unstable low-voltage conditions.
Application Scenarios
Widely deployed in utility-scale power plants, industrial cogeneration facilities, and large marine propulsion systems utilizing synchronous generators.
Performance Parameters
- Voltage Regulation: Better than ±0.5% steady-state accuracy.
- Transient Response: Meets stringent IEEE and IEC standards for dynamic voltage recovery.
- Reliability: Exceptional Mean Time Between Failures (MTBF) due to solid-state components.
Material Composition
Constructed with high-grade silicon steel laminations for the exciter stator and rotor, copper windings with Class H or F insulation, and a rugged cast-iron or steel housing.
Structural Characteristics
- Form Factor: Direct-coupled to the main generator shaft.
- Rotating Rectifier Assembly: Features a robust rotating diode wheel mounted directly on the rotor.
- Static Exciter Stator: Stationary field winding that induces AC voltage in the rotating armature.
Working Principle
The AVR controls the DC current to the stationary exciter stator. This creates a magnetic field that induces an AC voltage in the rotating exciter armature. The rotating rectifier assembly converts this AC to DC, which is fed directly to the main generator’s rotor field winding, establishing the main magnetic flux.
Installation Requirements
- Ensure precise shaft alignment between the exciter and the main generator.
- Verify the air gap and mechanical clearance according to the installation manual.
- Connect the AVR control wiring using shielded cables to prevent electromagnetic interference.
Usage Precautions
- Never operate the generator with an open field circuit to prevent dangerous voltage spikes.
- Regularly inspect the rotating rectifier diodes for open or shorted conditions.
- Monitor the exciter bearing temperatures and vibration levels during routine maintenance.
