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The GE DS200TCEBG1B Protective Termination Expander Board is a circuit board used in the General Electric Speedtronic Mark V Turbine Control System.1
It serves a critical role as a signal interface and conditioner within the turbine’s core protective circuitry.2
💡 Function and Location
The TCEB (Termination Common Expander Board) is installed in the P1 core slot of the Mark V control panel.3 Its primary responsibilities include:
- Signal Scaling: It scales (conditions) the high-level signals coming from the Potential Transformers (PTs) and Current Transformers (CTs).4 These scaled signals, representing generator and bus voltages/currents, are then passed to the TCCB (Turbine Control Core Board) for main control processing.5
- Protection Routing: It acts as a routing path for critical protection signals, such as:
- Emergency Overspeed signals (from magnetic pickups).6
- Flame Detection signals (from UV detectors).7
- These signals come from the PTBA (Protection Terminal Board Assembly) and are routed through the TCEB to the TCEA (Emergency Overspeed Boards) for protective processing.8
- Emergency Overspeed signals (from magnetic pickups).6
- Auxiliary Power: It conditions and transfers the 9$\text{335 V DC}$ power required for the UV flame detector devices.10
- Alarm Horn: The board typically houses the audible alarm horn for the Mark V LM system.11
🔎 Part Number Breakdown (DS200TCEBG1B)
The characters in the part number specify the board’s design and revision:
- DS200: Identifies the hardware series.12
- TCEB: Functional Acronym for Termination Common Expander Board.
- G1: Denotes the product group or assembly version.
- B: Indicates the Functional Revision of the board. This specific board is the first major revision (B)13 of the base G1 TCEB design, indicating updates or changes from the earlier DS200TCEBG1 (no suffix) or DS200TCEBG1A versions.
The revision suffix is vital for compatibility. When replacing a board, the general rule in the Mark V system is that newer revisions are backward-compatible, meaning a board with a later revision (like a G1B version) can typically replace an older revision (like a G1A version), but not vice-versa.
