GE IS200IVFBG1AAA Current Feedback Board

The GE IS200IVFBG1AAA is a Current Feedback Board (IVFB) used in General Electric’s high-power control systems, primarily the EX2100 Excitation System for generators and large industrial drive applications.

Its main purpose is to provide the main controller with a real-time, highly accurate measurement of current flowing through the system’s power circuits, which is essential for stable, closed-loop control.

⚙️ Core Function in Excitation Control

The IS200IVFBG1AAA is a critical component in the control loop that regulates a generator’s field current:

• Current Measurement: The board receives a low-level analog signal that is precisely proportional to the high DC current flowing through the main power bridge (like an SCR or PWM inverter bridge). This signal is typically generated by a current shunt located in the DC field circuit.

• Signal Conversion and Conditioning: The board contains specialized circuitry, including differential amplifiers, to accurately amplify, filter, and condition this low-level signal. This process converts the raw current data into a clean, stable signal that the main digital controller (e.g., the DSPX board) can process.

• Closed-Loop Regulation: This current feedback is vital for the Field Current Regulator (FCR). The controller compares the actual measured field current (provided by the IVFB board) against the desired current setpoint and adjusts the firing pulses to the power semiconductors to maintain precise regulation of the generator’s output voltage and reactive power.

• High Accuracy & Fast Response: The board is designed for high accuracy and fast response times, which are mandatory for ensuring the stability and efficiency of large power generation equipment under dynamic load conditions.

🔎 Revision Details and Nomenclature

• IS200: Identifies the board as part of GE’s Innovation Series of modular control components.

• IVFB: The functional acronym stands for Current Feedback Board (or a similar variation like an Exciter DC Feedback Board).

• G1AAA: Indicates the board belongs to Hardware Group 1, Artwork Revision A, with subsequent assembly or manufacturing revisions (AAA). The function remains consistent across these minor suffixes.