1. Product Overview

• Model: IS200EGDMH1AFF (EGDM)

• Brand: General Electric (GE)

• Series: EX2100 Excitation Control System, Core Detection Module in IS200 Series

• Type: Exciter Field Ground Detector Module

• Core Purpose: Monitors ground leakage resistance at any point on the AC/DC side of the generator excitation circuit. Works with the EXAM module for early ground fault warning and protection, ensuring safe and stable operation of the excitation system.

2. Core Functions

1. Precision Ground Leakage Detection: Actively applies voltage to the excitation circuit, measures ground resistance at any point, identifies AC/DC side ground faults, and prevents equipment damage and downtime caused by insulation degradation.

2. Cooperation with EXAM Module: The EXAM module first detects the voltage across the ground resistance. The signal is processed by the EGDM and transmitted to the DSPX controller via fiber optics, enabling full-link fault diagnosis and alarm.

3. Redundant Configuration & Auto-Switching: 1 unit for simplex systems; 3 units (Controller, Master 1, Master 2) for redundant systems. Auto-switching via program pins eliminates single points of failure.

4. Real-Time Status Monitoring: 3 LED indicators (Power, Active, Selective Master) on the front panel provide real-time feedback. Works with DSPX for remote monitoring and trend analysis.

5. High-Reliability Hardware Design: Mounts on the Exciter Power Backplane Rack (EPBP), installed close to the EPSM power module. Meets EMC and vibration requirements for harsh industrial environments.

3. Key Specifications

4. Key Features & Benefits

• Fault Prevention First: Proactively monitors ground leakage, early warns of insulation risks, and avoids excitation system faults from expanding to the generator unit.

• Redundant High Availability: 3-module redundant configuration with millisecond-level auto-switching, meeting 99.99% availability requirements for key scenarios such as power plants and oil & gas.

• Plug-and-Play Integration: Seamlessly compatible with the EX2100 system, collaborates with EPSM, EXAM, and DSPX modules without additional debugging.

• Easy Maintenance: LED status indication, fiber optic quick connection, and backplane rack installation facilitate fault location and replacement, reducing downtime.

• Harsh Environment Adaptability: Wide temperature range, vibration resistance, and EMI immunity, suitable for harsh working conditions such as outdoor power stations and offshore platforms.

5. Typical Applications

• Gas/Steam/Combined-Cycle Power Plants: Core ground protection for EX2100 excitation systems, ensuring generator grid connection and voltage stability.

• Large Generating Units: Real-time monitoring of ground faults in the excitation circuit to prevent major accidents caused by insulation breakdown.

• Petrochemical & Oil/Gas Fields: Excitation systems for industrial rotating machinery (turbines, compressors) meeting safety requirements for hazardous areas.