GE DS200TCEBG1ABC Protective Termination Expander Board

الوصف

The GE DS200TCEBG1ABC is a specific revision of the Protective Termination Expander Board (TCEB) used in the General Electric Speedtronic Mark V Turbine Control System.¹

The full part number structure of GE’s Mark V boards is highly informative, with the last characters denoting the revision level.

🔍 Understanding the Part Number

The GE part number DS200TCEBG1ABC breaks down as follows:

The revision code is crucial for replacement, as newer revisions are generally backward-compatible, but older revisions are often NOT forward-compatible with a system designed for a newer board.

⚙️ Function of the TCEB Board

The core purpose of the DS200TCEBG1ABC board is to act as a signal conditioning and routing interface, safeguarding the critical protective core of the turbine control system.²

1. Signal Scaling & Conditioning

• PT/CT Signals: It scales (converts) the high-voltage/high-current signals from the Potential Transformers (PTs) and Current Transformers (CTs) which measure generator and bus electrical parameters.³

   

• Routing: It routes these scaled signals to the TCCB (Turbine Control Core Board) for use in control and sequencing logic.

2. Protective Signal Routing

• It receives critical safety signals, such as those for emergency overspeed (from magnetic pickups) and flame detection (from UV detectors) from the PTBA (Protection Terminal Board Assembly).⁴

   

• It routes these signals to the triple-redundant TCEA (Emergency Overspeed Boards) for voting and protective trip logic.⁵

   

3. Auxiliary Functions

• Alarm Horn: The board typically holds the audible alarm horn for the Mark V LM system.⁶

   

• Flame Detector Power: It conditions and routes the ⁷$\text{335 V DC}$ power required for the UV flame detector devices.⁸

   

4. Location

The board is installed in the P1 core slot of the Mark V control panel, which houses the primary protective processor boards.⁹