GE IS200EDEXG1BQ De-Excitation Bridge and Protection Board

The GE IS200EDEXG1BQ is a De-Excitation Bridge and Protection Board from General Electric. This board belongs to the Innovation Series and EX2100 product lines. The manufacturer designed this board to manage de-excitation functions in excitation control systems. Therefore, it plays a critical role in safely dissipating field energy during shutdown conditions.

Functional Overview of the IS200EDEXG1BQ

First, the GE IS200EDEXG1BQ serves as a de-excitation control board within the EX2100 system. The board requires connection to the EMIO and EXTB boards for proper operation. Specifically, the EXTB board powers and controls the EDEX board during normal de-excitation sequences. However, the GE IS200EDEXG1BQ can initiate de-excitation independently if the EXTB control fails. Consequently, this redundancy enhances system safety and reliability.

Power and Location

Regarding power delivery, twenty-four VDC flows to the de-excitation module to power the GE IS200EDEXG1BQ. This board resides in an auxiliary cabinet, separate from the main control rack. For this reason, the board can operate in a more controlled environment while remaining close to the field equipment.

Technical Specifications of the IS200EDEXG1BQ

Configurable Jumpers

The GE IS200EDEXG1BQ includes six configurable jumpers for application flexibility. These jumpers are designated JP1, JP2, JP3, JP4, JP5, and JP6. Consequently, engineers can tailor the board’s behavior to match specific system requirements.

Connections and Manual

The board features two D-pin connectors for external interfaces. Reference manual GEH-6632 provides complete installation and configuration information. The board weight measures 3 lbs. 6 oz. (approximately 1.53 kg).

SCR De-Excitation Mode Operation

Normal SCR Firing

The GE IS200EDEXG1BQ utilizes a silicon-controlled rectifier (SCR) de-excitation mode. The SCR fires when the system needs a conduction path for field energy dissipation. Once the SCR fires, it creates a path through the field discharge inductor. Subsequently, this path allows the field current to flux and disperses the stored field energy. For this reason, the board safely reduces the magnetic field in the generator rotor.

Overvoltage Firing Protection

If for any reason the SCR cannot fire normally, the GE IS200EDEXG1BQ provides an overvoltage firing backup. This overvoltage firing occurs when the anode-to-gate voltage surpasses the breakover voltage of the break-over diode string. Notably, this diode string connects between the gate and anode functions. Therefore, the board offers a redundant firing mechanism for enhanced safety.

System Integration Requirements

Required Connections

The GE IS200EDEXG1BQ requires connection to three other boards for full functionality. First, it must connect to the EMIO board for command and status signals. Second, it must connect to the EXTB board for power and normal control. Third, the board receives 24 VDC from the de-excitation module for its internal circuits.

Operational Coordination

During normal operation, the EXTB board manages the de-excitation sequence. The GE IS200EDEXG1BQ follows these commands to fire the SCR appropriately. However, if the EXTB control fails, the EDEX board takes over independently. Consequently, the system maintains de-excitation capability even with a control board failure.

Installation Guidelines for the IS200EDEXG1BQ

First, mount the GE IS200EDEXG1BQ in the designated auxiliary cabinet location. Ensure the cabinet provides adequate clearance for airflow and wiring access. Then, connect the two D-pin connectors to the EMIO and EXTB boards as shown in manual GEH-6632. Next, configure the six jumpers (JP1 through JP6) according to your application requirements. After that, connect the 24 VDC power from the de-excitation module. Finally, verify all connections before commissioning the system.

Package Contents

• One (1) GE IS200EDEXG1BQ de-excitation bridge and protection board

• Six configurable jumpers (JP1-JP6, pre-installed)

Common FAQs for the IS200EDEXG1BQ

1. What is the primary function of the IS200EDEXG1BQ?
The GE IS200EDEXG1BQ manages de-excitation functions in EX2100 systems. It safely dissipates field energy by firing an SCR through the field discharge inductor.

2. What other boards must connect to the IS200EDEXG1BQ?
The GE IS200EDEXG1BQ requires connection to the EMIO and EXTB boards. The EXTB board provides normal power and control, while the EDEX can initiate de-excitation independently if the EXTB fails.

3. What happens if the SCR cannot fire normally?
If the SCR cannot fire normally, the GE IS200EDEXG1BQ provides overvoltage firing protection. This occurs when the anode-to-gate voltage exceeds the breakover voltage of the diode string.

4. Where does this board physically reside?
The GE IS200EDEXG1BQ resides in an auxiliary cabinet. This placement keeps the board close to the field equipment while providing a controlled environment.

5. How many configurable jumpers does this board include?
The GE IS200EDEXG1BQ includes six configurable jumpers: JP1, JP2, JP3, JP4, JP5, and JP6. These allow engineers to tailor board behavior to specific applications.

Why Choose the GE IS200EDEXG1BQ?

In summary, this de-excitation bridge and protection board delivers reliable field energy dissipation for EX2100 excitation systems. First, the SCR de-excitation mode provides controlled field current dispersal through the discharge inductor. Second, the overvoltage firing backup mechanism ensures de-excitation even if normal SCR firing fails. Third, the six configurable jumpers offer application-specific flexibility for different system requirements. Fourth, the board’s location in an auxiliary cabinet isolates it from main rack noise and heat. Fifth, the independent de-excitation capability provides redundancy if the EXTB control board fails. For these reasons, order the GE IS200EDEXG1BQ today for your EX2100 de-excitation protection requirements.