GE IS200EXAMG1BBA

Product Overview

The GE IS200EXAMG1BBA is an Exciter Attenuation Module (EXAM) designed for GE EX2100 excitation control systems. It plays an important role in the generator field ground detection circuit by conditioning and scaling high-voltage signals from the excitation bridge.

The module works together with the Exciter Ground Detector Module (EGDM) to monitor potential ground faults in the generator field winding. By converting high-voltage signals into usable measurement levels, it allows the ground detection system to evaluate electrical conditions more effectively.

In addition, the board supports field ground monitoring in both simplex and Triple Modular Redundant (TMR) excitation configurations.

Technical Specifications

Main Features

• High-Voltage Signal Attenuation: Scales excitation bridge voltage signals to suitable measurement levels.
• Ground Fault Monitoring: Supports detection of abnormal grounding conditions in generator field circuits.
• System Integration: Works with EGDM modules through the excitation power backplane.
• Redundant Configuration Support: Suitable for simplex and TMR system arrangements.
• Signal Conditioning: Helps provide reliable electrical measurements for ground detection.

Structure and Components

The board incorporates several electrical connection and signal-processing elements:

• Sense resistor circuit for field ground detection.
• Plug connectors for signal transmission.
• Stab-on terminals for field bus connections.
• Ground connection terminal.
• Adjustable jumper positions.
• Relay and associated electrical components.

These components work together to establish the measurement path between the excitation field circuit and the ground detection system.

Typical Applications

The module is primarily used in generator excitation and electrical protection environments, including:

• Thermal power generation systems.
• Gas turbine generator installations.
• Industrial synchronous generators.
• GE EX2100 excitation cabinets.
• Generator field ground monitoring systems.
• Power plant electrical control equipment.

Installation and Maintenance

The board is installed within the High Voltage Interface (HVI) assembly in the auxiliary cabinet. Before installation, technicians should verify the complete part number, hardware revision, connector positions, and system configuration.

During maintenance, inspect the connectors, jumper settings, grounding connections, and circuit components. Furthermore, use appropriate electrostatic discharge (ESD) precautions when handling the circuit board.

————————————————————————————————————-