1. Product Overview

• Model: IS200EGDMH1ADF (EGDM, Exciter Field Ground Detector Module)

• Brand: General Electric (GE)

• Series: EX2100 Excitation Control System, Mark VIe/Speedtronic Series

• Core Purpose: A dedicated module for detecting AC/DC side ground faults and insulation leakage in generator excitation circuits. Works with EXAM attenuator module and DSPX controller to provide ground fault protection and early warning, preventing equipment damage and unplanned shutdowns caused by insulation degradation.

2. Core Functions

1. Active Ground Leakage Detection: Actively applies test voltage to the excitation circuit, measures insulation resistance to ground at any point of the field winding, accurately identifies ground/low-resistance leakage faults on both AC and DC sides, and provides early warning of insulation risks.

2. Cooperative Operation: Works with the EXAM module—EXAM collects voltage across the ground sensing resistor; signals are processed by EGDM and transmitted to the DSPX controller via fiber optics for fault judgment, alarm and protection logic output.

3. Redundant Configuration & Auto-Switching: 1 unit for simplex systems; 3 units (Controller C, Master 1 M1, Master 2 M2) for redundant systems. Roles are defined by program pins on the P2 connector, supporting millisecond-level bumpless switching to eliminate single points of failure.

4. Visual Status Monitoring: Equipped with 3 front-panel LED indicators (Power, Active, Selective Master) for real-time status display; integrates with DSPX for remote monitoring, fault diagnosis and trend analysis.

5. High-Reliability Industrial Design: Double-slot, 6U height board, mounted on the Exciter Power Backplane Rack (EPBP) close to the EPSM power module. Wide temperature range, vibration-resistant and EMI-immune, suitable for harsh industrial environments such as power plants and oil & gas facilities.

3. Key Specifications

4. Key Features & Benefits

• Proactive Fault Prevention: Active monitoring and early warning prevent excitation ground faults from spreading to the generator body, reducing unplanned downtime.

• Redundant High Availability: Triple-module redundancy with automatic switching, meeting high-reliability requirements for critical power generation scenarios.

• Seamless System Integration: Fully compatible with EX2100/Mark VIe, EXAM, EPSM and DSPX; plug-and-play with no extra debugging required.

• Easy Maintenance & Diagnosis: LED status indication, quick fiber optic connection and backplane plug-in design enable fast fault location and replacement, minimizing maintenance time.

• Harsh Environment Adaptability: Wide temperature, vibration and EMI resistance, ideal for gas/steam power plants, combined-cycle plants and offshore platforms.

5. Typical Applications

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

• Large Steam/Gas Turbine Generators: Real-time monitoring of insulation/ground faults in excitation circuits, preventing major accidents from insulation breakdown and short circuits.

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