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The GE DS200TCEBG1BAA Protective Termination Expander Board is a vital component of the General Electric Speedtronic Mark V Turbine Control System, specifically designed for turbine protection and signal conditioning.1
It is an advanced revision of the base TCEB (Termination Common Expander Board).
⚙️ Core Function and Location
The DS200TCEBG1BAA is a circuit board that acts as an interface between various termination points and the main control and protection cores of the Mark V system.2
- Location: It is typically installed in the P1 core slot of the Mark V control panel.3
- Primary Role (Protection): The board provides a path for critical protection signals (Emergency Overspeed and Flame Detection) from the PTBA (Protection Terminal Board Assembly) to the TCEA (Emergency Overspeed Boards) for processing and execution.4
- Signal Conditioning: It scales (conditions) the high-voltage/current signals from the machine’s Current Transformers (CTs) and Potential Transformers (PTs), making them suitable for use by the TCCB (Turbine Control Core Board) for monitoring generator and bus voltages/currents.5
- Auxiliary Functions: It conditions and routes the 335 V DC power required for Ultraviolet (UV) flame detectors and often houses the system’s alarm horn.6
🔌 Key Connectors and Signal Routing
The DS200TCEBG1BAA features various connectors, with its major ribbon cable interfaces serving to route signals between core boards:7
| Connector Name | Destination/Source Board | Primary Function |
| JMP | TCCB Board | Carries the scaled PT and CT signals to the main control board. |
| JV | PTBA Terminal Board | Receives the unconditioned PT and CT signals from the machine terminals. |
| JU | PTBA Terminal Board | Receives the Magnetic Pickup (overspeed) and Flame Detection signals. |
| JKX, JKY, JKZ | TCEA Boards (Triple Redundant) | Carries the conditioned Emergency Overspeed and Flame Detection signals for protective voting. |
| JVA | PTBA Terminal Board | Routes the $\text{335 V DC}$ power (for flame detectors) to the terminal board. |
🔢 Revision Details (DS200TCEBG1BAA)
The part number indicates a board with multiple revisions:
- DS200TCEB: Protective Termination Expander Board.
- G1: Board Group/Assembly.8
- B, A, A (Suffixes): Indicate the Functional Revision (B) and subsequent minor revisions (A, A) to the functional or artwork design.9
In the Mark V system, revisions are important for compatibility. A board with a later revision (like G1BAA) is generally designed to be backward-compatible and can be used to replace earlier revisions of the TCEB (e.g., G1A or G1B) if all other specifications match.
