GE IS200EDEXG1ABA Exciter De-Excitation Board

GE IS200EDEXG1ABA Exciter De-Excitation Board

د.إ8,888.00

GE IS200EDEXG1ABA Exciter De-Excitation Board (EDEX) is a critical component in the GE EX2100 Excitation Control System.1 Its primary function is to ensure the safe and controlled dissipation of stored energy from the generator field during a shutdown or a fault condition.2

This process, known as de-excitation, is crucial for protecting the generator and preventing potentially damaging over-voltage conditions.3

🧠 Core Functions

The EDEX board performs several high-reliability functions to manage the rapid removal of magnetic energy from the generator rotor:4

1. Controlled Energy Dissipation (SCR Firing)5

  • The board is designed for SCR (Silicon Controlled Rectifier) de-excitation.6
  • When a trip or shutdown signal is initiated by the main controller (via the EMIO and EXTB boards), the EDEX fires its onboard SCRs.7
  • Firing the SCR creates a conduction path through a field discharge inductor (or crowbar circuit).8 This path directs the stored field current to safely decay through a resistive element, quickly reducing the generator’s magnetic flux.
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الوصف

The GE IS200EDEXG1ABA Exciter De-Excitation Board (EDEX) is a critical component in the GE EX2100 Excitation Control System.1 Its primary function is to ensure the safe and controlled dissipation of stored energy from the generator field during a shutdown or a fault condition.2

This process, known as de-excitation, is crucial for protecting the generator and preventing potentially damaging over-voltage conditions.3

🧠 Core Functions

The EDEX board performs several high-reliability functions to manage the rapid removal of magnetic energy from the generator rotor:4

1. Controlled Energy Dissipation (SCR Firing)5

  • The board is designed for SCR (Silicon Controlled Rectifier) de-excitation.6
  • When a trip or shutdown signal is initiated by the main controller (via the EMIO and EXTB boards), the EDEX fires its onboard SCRs.7
  • Firing the SCR creates a conduction path through a field discharge inductor (or crowbar circuit).8 This path directs the stored field current to safely decay through a resistive element, quickly reducing the generator’s magnetic flux.

2. Voltage Retention & Self-Firing

  • Emergency Power: The EDEX board contains a voltage hold-up circuit (capacitors) that retains voltage on the 9$\pm 24\text{ V DC}$ rails even during a total power failure.10
  • Independent Action: This retained power ensures that the board can still fire the SCRs to initiate de-excitation if the main control power is lost, enhancing system reliability during critical emergency shutdowns.11
  • Self-Firing Backup: The board also has a break-over diode network that will automatically fire the SCR if the anode voltage exceeds a predefined threshold, providing a final, independent over-voltage protection mechanism.12

3. Conduction Sense Feedback

  • The board uses Hall Effect sensors located on its top edge to detect the flow of current in the field circuit.13
  • These sensors provide conduction sensing feedback signals (typically M1 and M2) to the main controller, allowing the system to monitor the de-excitation process and confirm that the SCRs have successfully turned on (are conducting).14

🛠️ Technical Specifications

Feature Details
System GE EX2100 Excitation Control System
Function Exciter De-Excitation and Protection Module
De-Excitation Type Group 1 (SCR De-Excitation)
Control Interface Typically controlled by the EXTB (Exciter Terminal Board) and triggered by the EMIO (Exciter Multiple I/O) board.
Emergency Feature Onboard Voltage Hold-Up Circuitry for power failure operation.
Sensors Hall Effect Conduction Sensors for monitoring current flow.
Connections Features D-Pin connectors for connection to control boards.

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