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The GE IS200EBACG2A Bridge AC Feedback Board (EBAC) is a critical component used in the GE EX2100 Excitation Control System for large synchronous generators.
Its primary function is to measure and condition the high-voltage AC feedback signals specifically from the Thyristor (SCR) Exciter Bridge. This feedback is crucial for the precise firing control of the SCRs, which regulates the field current supplied to the generator.
⚡ Key Technical Specifications (G2 Version)
The distinguishing feature of the G2 version (indicated by the G2 in the part number) is its designed voltage range, making it suitable for higher voltage excitation systems.
| Feature | Details |
| System | GE EX2100 Excitation Control System (often used with EX2100e) |
| Function | Exciter Bridge AC Voltage and Current Feedback |
| Input Voltage Rating (G2) | Nominal AC input voltage up to 1000 V rms (+20%) at 50/60 Hz. |
| Inputs | Accepts three-phase AC voltage feedback from the bridge for synchronizing the control system’s firing pulses. |
| Transformers | Contains transformers used to safely scale down the high AC voltage to a low, measurable level for the control electronics. |
| Processor Interface | Outputs measured data via DB9 connectors to the main controllers (M1, M2, and C) through the backplane. |
💡 EBAC Board Functionality
The EBAC board plays a crucial role in the closed-loop control of the exciter bridge:
- Synchronizing Reference: It provides the zero-crossing references of the bridge’s input AC voltage. The control system (DSP on the DSPX board) uses these references to accurately determine the exact moment to fire the Silicon Controlled Rectifiers (SCRs) to achieve the commanded DC field current.
- Safety and Isolation: By using onboard transformers, the EBAC board electrically isolates the high-voltage power circuit from the sensitive, low-voltage control electronics, ensuring safety and protecting the controller.
- G1 vs. G2: The G1 version of the EBAC board is typically rated for nominal AC input voltages up to 480 V rms, while the G2 version (like the IS200EBACG2A) handles voltages up to 1000 V rms.
The accurate and immediate feedback from the EBAC board is essential for stable Automatic Voltage Regulation (AVR) and rapid response to generator load changes.
