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The GE part number IS200EDCFG1B is a DC Feedback Card for the EX2100 Excitation Control System. Its primary function is to accurately measure and provide feedback of the direct current (DC) field voltage and field current at the Silicon Controlled Rectifier (SCR) bridge. This data is essential for the EX2100 system to precisely regulate the generator’s output voltage. ⚡
Function and Key Features
A generator’s excitation system uses a rectifier bridge (often an SCR bridge) to convert AC power into the DC power needed for the generator’s field windings. The EDCF board monitors this DC power.
- DC Field Voltage and Current Measurement: The board measures the DC voltage and current that are being supplied to the generator’s rotor field. The field current is measured across a DC shunt at the SCR bridge, which produces a low-level signal. The field voltage is measured across the bridge and the current shunt.
- Fiber Optic Communication: A key feature of this board is its use of a high-speed fiber-optic link to communicate with the main control panel. This provides a high degree of electrical isolation and noise immunity, which is critical in the high-voltage, high-noise environment of a power plant.
- Signal Conditioning: The board contains amplifiers and scaling circuits to convert the raw field measurements into a usable signal for the main controller. It also has jumper settings to scale the voltage measurement based on the bridge application.
- System Integration: The EDCF card works in conjunction with the main control card (like a DSPX) and other I/O boards to form the complete excitation control system.
- Robust Design: Like all GE industrial control components, it’s built to withstand the harsh conditions of a power plant.
Applications
The IS200EDCFG1B is a legacy component primarily found in power generation facilities. It is an essential component for:
- Excitation Control: It provides the core data necessary for the EX2100 system to precisely control the generator’s voltage and reactive power.
- Protection and Diagnostics: The board is a crucial part of the system’s protection logic, allowing it to detect and respond to faults such as overcurrents or voltage spikes in the DC field circuit.
