GE DS200TCEAG2B Emergency Overspeed Board

الوصف

The GE DS200TCEAG2B is an Emergency Overspeed Board (Functional Acronym: TCEA) for the GE Speedtronic Mark V Gas Turbine Control System, specifically often associated with the Mark V LM Series (for aero-derivative turbines).¹

Its primary function is to serve as an independent, high-speed safety processor to protect the turbine from overspeed and other critical failure conditions.²

🛑 Function and Location

The DS200TCEAG2B is a critical component that enforces the highest level of safety on the turbine.³

• Emergency Overspeed Trip: Its main job is to constantly monitor the turbine’s rotational speed, particularly the high-pressure (HP) and low-pressure (LP) shafts.⁴ If the speed exceeds a preset emergency limit, the board will quickly de-energize the Emergency Trip Relays (ETRs) on the Turbine Trip Board (TCTG) to shut down the unit.⁵

   

• Flame Detection: It also processes signals for flame detection and can initiate a trip if it detects a flame-out condition in the combustor.⁶

   

• Location: The board is mounted in the Protective Core (⁷$\text{P1}$) of the Mark V panel.⁸ In a typical Triple Modular Redundancy (TMR) system, three TCEA boards (labeled X, Y, and Z) are used to ensure no single component failure can prevent a critical trip.⁹

   

Redundancy and Voting

The TCEA boards work together to provide fault tolerance:

1. Input Conditioning: The boards receive signals from the speed magnetic pickups, often routed through the PTBA terminal board.¹⁰

    

2. Data Transmission: The TCEA boards condition and scale the signals, then transmit the data over the IONET to the R1 core.¹¹

    

3. Voted Trip: The ¹²$\text{I/O}$ Engine performs a median selection (voting) on the values from the three TCEA boards.¹³ For trip signals, the TCEA sends an emergency trip request to the TCTG board, which then uses 2/3 relay driver-level voting to finalize the trip, ensuring exceptional reliability.¹⁴

    

🛠️ Hardware and Configuration

The DS200TCEAG2B is microprocessor-based, utilizing an Intel 80196 microprocessor to execute the safety firmware and logic.¹⁵

The “G2” in the part number ($\text{DS200TCEAG2B}$) signifies a later generation or revision of the board compared to the $\text{G1}$ version, often incorporating minor component updates or design refinements.