Product Core Summary
- Model: GD B021 BE HIEE410455P104
- Manufacturer: ABB
- Core Function: Generates and distributes precise gate firing pulses to thyristors in the excitation power bridge, ensuring accurate control of field current in static excitation systems.
- System Compatibility: Compatible with ABB UNITROL series static excitation systems, particularly in medium to large generator applications.
- Supply Status: Obsolete spare part, sourced from verified global inventory with availability for legacy support.
- Warranty Standard: 12-month functional warranty, fully tested.
Key Technical Specifications
- Product Model: GD B021 BE HIEE410455P104
- Manufacturer: ABB
- System Platform: UNITROL Excitation System
- Pulse Channels: Multiple independent outputs for 6-pulse or higher bridge configurations, optically isolated.
- Firing Method: Pulse transformer or direct optical triggering for high-voltage thyristors.
- Blocking Voltage Support: Compatible with thyristors up to 4500 V or higher, depending on system rating.
- Pulse Timing Accuracy: Microsecond-level precision for symmetric conduction and minimal harmonics.
- Power Supply: 24 V DC or derived from system auxiliary, with wide input tolerance.
- Operating Temperature Range: -25 °C to +70 °C, suitable for enclosed power converter cabinets.
- Communication Interface: Fiber-optic or electrical links to central controller for pulse command reception.
- Isolation: >2500 V galvanic isolation between control and power stages.
- Dimensions: Compact PCB format, typically 200 mm x 150 mm x 40 mm.
- Weight: Approximately 0.8 kg.
- Certifications: CE marked, compliant with IEC 61010 and EMC standards for power electronics.
- Response Time: Sub-microsecond gate drive rise/fall for rapid current control.
- Environmental Protection: Conformal coating and robust design for vibration and contamination resistance.
Technical Architecture & Functional Positioning
The GD B021 BE module serves in the power interface layer of the UNITROL static excitation system, positioned between the digital AVR controller and the thyristor bridge. It receives firing angle commands via high-speed links and converts them into amplified, isolated gate pulses, synchronizing precisely with the AC mains phase to regulate DC output current.
Core technologies encompass pulse transformers for reliable energy transfer to thyristor gates, along with snubber and feedback circuits for protection against dv/dt stress and misfiring. This design supports both continuous regulation and forcing modes, enabling up to 200% ceiling current for transient support. Redundant configurations often employ dual boards for seamless failover, critical in preventing excitation loss.
These features directly mitigate risks like asymmetric firing leading to torque pulsations or DC components in the field winding, which could cause rotor heating or mechanical stress. In high-power applications, the board’s noise immunity and fast response enhance system damping, contributing to power system stabilizer performance and grid stability compliance.
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