IS200EDEXG1AEA - Exciter De-Excitation Control Board

SPECIFICATIONS

Part No.: IS200EDEXG1AEA
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Temperature: -30 to +65oC
Size: 3.175 cm high x 12.7 cm wide
Product Type: Exciter De-Excitation Control Board
Availability: In Stock
Series: EX2100e

Functional Description

IS200EDEXG1AEA is a Exciter De-Excitation Control Board developed by GE. It is a part of EX2100e excitation system. The primary function of the board is to control the de-excitation process in the event of an emergency shutdown. When the field breaker or contactors open. The EDEX board facilitates SCR firing, a crucial aspect of the de-excitation process. By controlling the firing of SCRs, the board regulates the flow of current through the excitation system, ensuring controlled and gradual discharge of energy to prevent abrupt voltage surges or system instability.

Features

• Conduction Sense Feedback: To monitor and regulate the de-excitation process effectively, the board incorporates conduction sense feedback mechanisms. These feedback circuits provide real-time information on the conduction status of SCRs and other components, allowing the board to adjust firing sequences and maintain optimal system performance.
• Voltage Retention: In the event of a power failure or interruption, the board ensures voltage retention within the excitation system. By managing voltage levels and retention mechanisms, the board safeguards against potential voltage drops or fluctuations, enabling continuous operation and stability during transient conditions.
• Integration with EMIO and EXTB Boards: The EDEX board collaborates with other modules within the excitation system, such as the EMIO (Exciter Main Input/Output) and EXTB (Exciter Terminal Board). EMIO initiates the de-excitation process, while the board handles the opening of the 41dc contactor or breaker. The board then receives de-excitation signals from the auxiliary contacts and coordinates SCR firing circuits accordingly.
• Emergency Shutdown Management: During emergency shutdown scenarios, the board acts as a critical component in the excitation system, ensuring the safe and efficient de-excitation of the generator field. Its robust control algorithms, feedback mechanisms, and integration with other modules contribute to the reliability and effectiveness of the emergency shutdown process.

Application data

• Power Input: Power is supplied to the board through connectors J1 and J2. These connectors serve as the primary power input terminals, providing the necessary electrical supply for the operation of the board and its associated components.
• Signal Connection: The cable carrying the de-excitation signal from the EXTB module connects to connector J8 on the board. This signal serves as the trigger for initiating the de-excitation process, allowing the board to activate SCR firing circuits and facilitate energy dissipation from the generator field.
• Stab Connectors: Stab connectors E1B through E12 are provided on the board for wire jumpers. These jumpers are used to select the break over diodes and current limiting resistors required for the voltage and size of the SCR (Silicon Controlled Rectifier). Proper configuration of these jumpers ensures optimal performance and compatibility with the specific excitation system configuration.
• SCR Anode Connection: Stab connector E1A is wire jumpered to the SCR anode. This configuration establishes the electrical connection between the SCR (Silicon Controlled Rectifier) and the board, facilitating SCR firing and control during the de-excitation process.

The WOC team is always available to help you with your EX2100e requirements. For more information, please contact WOC.

Frequently Asked Questions

What is IS200EDEXG1AEA?
It is a Exciter De-Excitation Control Board developed by GE under the EX2100e series.

Why is it necessary to use multiple de-excitation SCRs for large field current applications?
In large field current applications, the energy dissipation requirements during de-excitation may exceed the capacity of a single SCR. By using multiple de-excitation SCRs, the load can be distributed across multiple devices, ensuring effective energy dissipation and preventing overload conditions.

How are multiple de-excitation SCRs controlled?
Each de-excitation SCR is controlled by an board connected in a Master-Follower configuration. This configuration allows for coordinated control of multiple SCRs, ensuring synchronized operation and effective energy dissipation.

What is a Master-Follower configuration?
In a Master-Follower configuration, one board acts as the Master, while the other boards act as Followers. The Master board coordinates the operation of the Followers, ensuring synchronized firing of the SCRs and optimal energy dissipation across all devices.