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The GE DS200TCEBG1BAA Protective Termination Expander Board (TCEB) is a crucial printed circuit board (PCB) developed by General Electric for their Mark V Speedtronic Turbine Control System.1
The part number DS200TCEBG1BAA signifies a specific revision, where:
- TCEB stands for Termination Circuits Expander Board (sometimes called Common Circuits EOS Board).2
- G1BAA indicates a version with two functional revisions (B and A) and one artwork revision (A) applied to the base G1 design.3
🛡️ Primary Functions
The TCEB serves a vital role in protecting and conditioning critical signals related to the turbine and generator:4
- PT and CT Signal Scaling: It scales down the high-level signals from the Potential Transformers (PT) and Current Transformers (CT).5 These conditioned signals are then sent to the TCCB (Turbine Core Control Board) to accurately measure:6
- Generator Voltages7
- Bus Voltages
- Line Current
- Protection Signal Routing: It provides the critical pathway for safety signals, including those for emergency overspeed magnetic pick-up and flame detection.8 These signals travel from the PTBA terminal board, through the TCEB, and are distributed to the TCEA (Emergency Overspeed) boards for redundant processing.9
- Flame Detector Power: It processes and routes the 335 V DC power from the TCEA boards to the PTBA terminal board, which in turn feeds the UV flame detector sensors.10
- Protection Features: As a “Protective” board, it is designed with features to safeguard sensitive components from electrical faults, including overvoltage protection, overcurrent protection, and EMI/RFI filtering.11
- Audible Alarm: In the Mark V LM series, the audible alarm horn is physically located on the TCEB.12
- Location: This board is typically installed in the P1 core slot of the Mark V control panel rack.13
📌 Key Connectors and Specifications
The board is a fixed-function hardware component, meaning it has no field-configurable hardware jumpers or software configuration.
| Feature | Specification / Examples |
| Power Requirement | $+5 \text{ V dc}, 6 \text{ A}$ |
| Operating Temperature | $-30^\circ \text{C to } +65^\circ \text{C}$ |
| Connector Count | 3 Bayonet, 4 Signal Transformers, 1 $\times$ 26-pin, 4 $\times$ 10-pin, 3 $\times$ 20-pin |
| Critical Connectors | JMP: PT/CT signals to TCCB
JV: PT/CT signals from PTBA JKX/Y/Z: Overspeed/Flame detection signals to TCEA boards JVA: Routes 335 V DC to PTBA for flame detectors |
The DS200TCEBG1BAA is an important component of the overall turbine control and protection system.
