DS200EXDEG1ABA - De-Excitation Control Board

SPECIFICATIONS

Part No.: DS200EXDEG1ABA
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
PCB Coating: Conformal
Technology: Surface-mount
Temperature Operating: -30 to 65oC
Product Type: De-Excitation Control Board
Availability: In Stock
Series: EX2000

Functional Description

DS200EXDEG1ABA is an De-Excitation Control Board developed by GE. It is a part of EX2000 excitation system. The primary function of the De-Excitation Module is to dissipate energy from the generator field during normal or emergency shutdowns. When such shutdown events occur, the module plays a critical role in controlling and limiting the voltage across the generator field. This is achieved by effectively managing the field breaker or contactors, ensuring that energy dissipation is regulated and controlled within safe parameters.Comprising several key elements, including the EXDE board itself, a Conduction Sensor board, a steel core designed to concentrate flux for the conduction sensors, and additional components such as a 53 mm or 77 mm SCR, the module is further supported by a sheet metal base for secure mounting of these devices.

Features

• Conduction Sensor Board: Works in conjunction with the EXDE board to detect and monitor the flow of current within the system, providing vital feedback for precise control and regulation.
• Steel Core: Strategically designed to concentrate magnetic flux for the conduction sensors, enhancing their sensitivity and accuracy in detecting current flow and facilitating efficient energy dissipation.
• SCR: Available in different sizes (53 mm or 77 mm), the SCR plays a crucial role in controlling the flow of current within the system, allowing for precise regulation and management of energy dissipation.
• Sheet Metal Base: Provides a sturdy and secure mounting platform for the various components of the De-Excitation Module, ensuring stability and reliability in operation, even under demanding conditions.

Operational Benefits

• Safe Shutdowns: By effectively removing energy from the generator field during shutdown events, the module contributes to safe and controlled shutdown procedures, minimizing the risk of damage or instability.
• Voltage Regulation: Through careful control of the field breaker or contactors, the module ensures that voltage across the generator field is maintained within safe limits, protecting equipment and preventing overvoltage conditions.
• Energy Management: By limiting the energy dissipated in the contactors, the module helps optimize energy usage and reduces stress on critical components, prolonging their lifespan and enhancing overall system reliability.

Power Supply

• Terminal Boards: The EXDE board features terminal boards labeled 2TB and 5TB to accommodate the positive and negative 24 V DC power inputs. These terminal boards serve as connection points for the external power source, ensuring reliable power distribution to the control circuits.
• Alternative Power Sources: In certain scenarios where the power source differs from that supplying Master 1 or Master 2, positive 24 V DC can be supplied through terminal boards 3TB and 6TB respectively. However, this configuration is not commonly utilized in standard operating conditions.
• Logic Power for SCR Firing: In addition to the main power inputs, logic power required for firing the Silicon-Controlled Rectifier (SCR) is supplied separately. This 24 V logic power is essential for controlling the SCR's operation and is distributed through TB1 for control circuit 1 or TB4 for control circuit 2. This ensures that the SCR functions as intended, facilitating precise control and regulation of current flow within the system.
• Voltage Compatibility: It's imperative to ensure that the external power supply provides the required 24 V DC voltage levels, as specified by the EXDE board's operational requirements.
• Proper Wiring: Correctly connecting the power inputs to the designated terminal boards is essential to prevent electrical issues and ensure reliable operation of the EXDE board.
• SCR Firing Logic: Maintaining the integrity of the logic power supply for SCR firing is crucial for the accurate control and regulation of current flow, contributing to the overall efficiency and safety of the system.

The WOC team is always available to help you with your EX2000 requirements. For more information, please contact WOC.

Frequently Asked Questions

What is DS200EXDEG1ABA?
It is a de-excitation control board developed by GE under the EX2000 series.

What are testpoints, and why are they important on the board?
Testpoints are designated locations on the board where specific signals or voltages can be measured or checked. They are essential for troubleshooting, diagnostics, and verifying the proper functioning of the board's components and circuits.

How many testpoints are available on the board, and what signals can be checked using them?
The board features ten testpoints, allowing for the checking of various signals and voltage levels. These include the master pulse signal, gate pulse signals for control circuits 1 and 2, as well as positive 5, 12, and 24 V DC for both control circuits.

Why would someone need to check the master pulse signal on the board?
The master pulse signal is a critical aspect of the board's operation, responsible for coordinating and synchronizing the firing of the SCR and other control functions. Checking this signal ensures that it is being generated correctly and is synchronized with the system's requirements.