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The GE IS200EDEXG1A and GE IS200EDEXG1AFA function as dedicated exciter de-excitation boards for turbine systems. These modules belong to the Mark VI series from General Electric. They rapidly discharge field energy during emergency shutdown conditions. Consequently, these boards protect the exciter from over-voltage damage during fault events.
Technical Specifications
The table below lists the precise parameters for the GE IS200EDEXG1A and IS200EDEXG1AFA .
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Full Model Numbers | GE IS200EDEXG1A , GE IS200EDEXG1AFA |
| Product Category | Exciter De-Excitation Board |
| Dimensions (H x W x D) | 2.5 cm x 14.5 cm x 26.0 cm |
| Weight | 0.38 kg (0.84 lbs) |
| Primary Interface | One 64-pin backplane connector and terminal blocks |
| De-Excitation Channels | 2 independent field discharge channels |
| Component Count | Approximately 160 resistors and 70 capacitors |
| Energy Storage | Four 470 µF electrolytic capacitors |
| Discharge Resistance | 10 Ω per channel for controlled field decay |
| Operating Temperature | -30°C to +65°C |
Functional Design and Field Discharge
The GE IS200EDEXG1AFA connects directly to the exciter backplane of the cabinet. It receives trip commands from the protection system. Then, this board inserts discharge resistors into the field circuit instantly. Each channel includes a high-speed contactor for reliable switching. Therefore, the IS200EDEXG1A safely dissipates stored magnetic energy during shutdowns.
Installation and Compatibility Notes
You must verify the discharge path before installing this de-excitation board. The GE IS200EDEXG1A fits exclusively into Mark VI series exciter cabinets. Always replace faulty units with identical GE board revisions. Additionally, check the contactor ratings against your field current. This practice prevents contact welding during high-current interruptions.