The GE IS200EGDMH1ADE is an Exciter Field Ground Detector Module used in the GE EX2100 excitation control system, commonly paired with Mark VI turbine control systems.
Its main function is to detect ground faults (insulation leakage) in the generator field circuit, ensuring early warning and protection against electrical damage in turbine-generator systems.
In simple terms, it continuously checks whether the generator field winding is accidentally leaking current to ground, which is critical for preventing major generator failures.
Technical Specifications
| Parameter | Specification |
|---|---|
| Module Type | Exciter Field Ground Detector (EGDM) |
| Series | GE EX2100 |
| Function | Ground fault detection in generator field circuit |
| Channels | 12 signal processing channels |
| Input Signal | 4–20 mA |
| Output Signal | 0–20 mA analog output |
| Common Mode Range | ±5 V |
| Lead Resistance | up to 15 Ω |
| Technology | Surface-mount electronics |
| Control Interface | DSPX / EXAM communication via fiber optic link |
| Operating Temperature | -30°C to +65°C |
| Mounting | EPBP Exciter Power Backplane rack |
| Redundancy Support | 1 module (simplex) or 3 modules (redundant C/M1/M2 setup) |
Physical Characteristics
| Item | Value |
|---|---|
| Form Factor | 6U double-slot module |
| Weight | ~0.3–0.5 kg |
| Dimensions | ~18 × 12 × 6 cm (varies slightly by revision) |
System Role
The IS200EGDMH1ADE is a protection and monitoring module, not a control processor.
It performs:
- Detection of field-to-ground leakage resistance
- Monitoring of generator field insulation health
- Sending real-time fault signals to control system
- Supporting redundant excitation configurations (C / M1 / M2 roles)
- Working with EXAM module and DSPX controller via fiber optics
How It Works (Simplified)
- The system injects a test signal into the generator field circuit
- The EGDM measures leakage current through a sense resistor
- The signal is conditioned and converted using internal electronics
- A fiber-optic link sends the processed result to the control system
- If leakage exceeds limits → alarm or trip is triggered
