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The GE IS200EXHSG3AEC Exciter High-Speed Relay Driver Board (EXHS) is a specialized circuit board integral to the GE EX2100 Excitation Control System.1
This system is used for managing the field current and AC terminal voltage of large synchronous generators (like those on gas or steam turbines).2
The key distinguishing feature of the G3 variant, compared to the earlier G1 boards, is the specific control topology it supports.
⚡ Core Function and G3 Distinction
The primary purpose of any EXHS board is to act as the high-speed interface between the main controller and the high-power switching components of the exciter.3
1. High-Speed Control Functions
The board provides the necessary solid-state drivers and control logic for crucial, fast-acting components:4
- De-Excitation Control: Drives the pilot relay for the De-Excitation Relay (KDEP).5 This is a critical safety function for quickly removing the generator’s magnetic field during a trip to protect the rotor from overvoltage and damage.
- Field Flashing Control: Drives the pilot relays for the Field Flashing Relays (53A and 53B), which are used to initially establish the magnetic field required for generator start-up.6
- Contactor/Breaker Control: Manages the switching of the main exciter power path.7
2. G3 Distinction: Breaker Control Mode
The “G3” in the part number (IS200EXHSG3AEC) indicates a specific configuration that is different from the more common G1:8
| Feature | G1 Variant (e.g., IS200EXHSG1) | G3 Variant (IS200EXHSG3AEC) |
| Control Mode | Contactor Mode | Breaker Mode |
| Close Component | Uses a DC Contactor (41) for connecting power. | Uses a DC Field Breaker (41) for connecting power. |
| Trip Relay | Typically only contains the Close Relay (41). | Contains both a Close Relay (41) and a dedicated Trip Relay (41T) to manage the Field Breaker. |
| Redundancy | Used in Redundant (TMR) systems. | Used in Redundant (TMR) systems. |
In short, the IS200EXHSG3AEC is the High-Speed Relay Driver board designed for EX2100 systems that utilize a DC Field Breaker (instead of a contactor) to handle the main generator field connection.
⚙️ Technical Details
- System: EX2100 Excitation Control System (often Mark VI/VIe).9
- Type: Exciter High-Speed Relay Driver Board (EXHS).10
- Redundancy: Designed for Triple Modular Redundant (TMR) control, connecting to the M1, M2, and C controllers via ribbon cables on the backplane.11
- Connectivity: Features multiple connectors, including three ribbon connectors (J505, J508, J515) to interface with the Exciter Main Input/Output (EMIO)12 boards.
- Status Signals: Conditions and sends critical status signals (De-excitation and Crowbar status) back to the EMIO boards for system monitoring.13
- Contact Wetting: Provides 70 VDC for wetting auxiliary contacts (41, 53A, 53B) to ensure reliable status feedback.14
If you are working with an EX2100 system, it is crucial to use the correct G-version (G1, G3, etc.) that matches your system’s hardware configuration (Contactor vs. Breaker).
