Description

The IS200EDEXG1B is a de-excitation bridge and protection board used within the GE EX2100 excitation control platform. It is designed to safely dissipate stored energy from generator field inductance during de-excitation events and provides protection functions for the excitation system. The board operates in conjunction with the EMIO and EXTB boards, where the EXTB board supplies power and control signals while supporting de-excitation control functions.

The General Electric IS200EDEXG1B receives 24 VDC operating power and is typically installed within an auxiliary cabinet equipped with a silicon-controlled rectifier (SCR) de-excitation system. During a commanded de-excitation event, the SCR establishes a conduction path through the field discharge inductor, allowing field current to decay and stored magnetic energy to dissipate. If SCR triggering control becomes unavailable, the board incorporates overvoltage firing protection through a break-over diode string connected between the gate and anode circuits.

As part of the EX2100 excitation control architecture, the module supports generator protection functions by ensuring controlled field discharge during normal shutdowns and fault conditions. Hall effect conduction sensors mounted within a circular steel core provide current monitoring capability for de-excitation operations.

Features

• Designed for GE EX2100 excitation control systems
• Functions as a de-excitation bridge and protection board
• Supports SCR-based de-excitation operation
• Dissipates stored generator field energy
• Operates with EMIO and EXTB control boards
• Powered by a 24 VDC supply
• Includes Hall effect conduction sensors
• Provides overvoltage-triggered SCR firing protection
• Equipped with six configurable jumpers
• Features two D-pin connectors for system integration
• Installed within an auxiliary excitation cabinet

Applications

• Generator excitation control systems
• Utility power generation facilities
• Industrial turbine-generator installations
• Steam turbine excitation systems
• Gas turbine excitation systems
• Synchronous generator protection systems
• Power plant modernization projects
• EX2100 excitation cabinet assemblies

Technical Specifications

Connections/Interfaces

Installation Guidelines

• Cabinet Mounting: Install the board within its designated slot in the EX2100 auxiliary cabinet, ensuring proper mechanical alignment and engagement with backplane interfaces.
• Wiring and Connections: Connect the two D-pin interface cables securely to establish appropriate communication lines with the EMIO and EXTB boards.
• Jumper Configuration: Verify and set configurable jumpers JP1 through JP6 in strict accordance with the system design requirements outlined in the GEH-6632 user's guide before applying power.
• Electrostatic Discharge (ESD) Precautions: Handle the module using standard industrial anti-static wrist straps and ESD-safe packaging to avoid damage to sensitive board-level components.
• Cooling and Ventilation: Ensure the auxiliary cabinet's ventilation pathways are clear to support proper thermal convection around the SCR and inductor components.