GE IS200EDCFG1AED Exciter DC Feedback Board

الوصف

The GE IS200EDCFG1AED Exciter DC Feedback Board (EDCF) is a vital component of the GE EX2100 Excitation Control System.¹ Its critical and isolated function is to accurately measure the generator’s Field Current (DC) and Field Voltage (DC) directly at the SCR (Thyristor) bridge.²

This high-accuracy, noise-immune feedback is paramount for the EX2100 controller to maintain stable closed-loop control of the exciter bridge and regulate the generator’s output.³

⚙️ Core Functions and Isolated Measurement

The EDCF board is situated in the high-power section of the exciter cabinet, demanding robust signal isolation.

1. Field Current Measurement

• Method: Measures the voltage drop across a DC current shunt located in the exciter bridge circuit.⁴
• Processing: This low-level analog signal is amplified and then converted into a frequency signal using a Voltage-Controlled Oscillator (VCO).

2. Field Voltage Measurement

• Method: Measures the high DC voltage across the exciter bridge terminals.
• Processing: The high voltage is safely scaled down using jumper-selectable settings (up to seven settings) to match the exciter’s maximum voltage, and then processed through a separate VCO.⁵

3. Isolated Communication (Fiber-Optic Link)

The most critical feature of the EDCF is how it transfers data to the control cabinet:

• The frequency-encoded current and voltage signals are transmitted to the main control panel via high-speed fiber-optic links (one fiber for current, one for voltage).⁶
• This fiber-optic link ensures complete electrical isolation and superior noise immunity, preventing the high-voltage noise from the bridge from interfering with the sensitive control electronics in the main rack.

🛠️ Technical Specifications

The IS200EDCFG1AED is therefore the highly accurate and isolated data source that enables the EX2100 to effectively implement Automatic Voltage Regulation (AVR).