GE DS200TCTGG1A Turbine Trip Board

الوصف

The GE DS200TCTGG1A Turbine Trip Board (TCTG) is a vital, safety-critical circuit board used in the General Electric Speedtronic Mark V Gas/Steam Turbine Control System.¹ It is often referred to as a Simplex Trip Board because it also serves functions in simplex (non-triple redundant) system configurations.²

Its primary function is to directly interface with and control the trip relays that initiate an emergency shutdown (a “trip”) of the turbine.³

🛡️ Key Functionality

The $\text{DS200TCTGG1A}$ handles the final, critical steps in the turbine’s protection sequence:

1. Houses Trip Relays: The board contains the electromechanical relays necessary to execute a trip.⁴ It houses the Primary Trip Relays (PTRs) and often interfaces with the Emergency Trip Relays (ETRs), which are controlled by the ⁵$\text{TCEA}$ (Turbine Control and Emergency Action) boards in the control core.⁶
2. Fuel Shutoff Control: It provides the signals that open/close the electrical circuits to the hydraulic trip block, which then controls the turbine’s fuel stop valves or steam stop valves. A trip requires these valves to shut quickly to stop the energy input to the turbine.
3. Voting Interface (TMR Systems): In the Triple Modular Redundant (TMR) architecture of the Mark V, the board receives protective signals from the $\text{R, S, and T}$ controllers. For critical ETR functions, the board often facilitates a two-out-of-three voting logic at the hardware level, meaning if two out of the three redundant controllers call for a trip, the trip is executed.⁷
4. Auxiliary Functions: The board also houses additional relays used for various control functions, notably the synchronizing relays used for connecting the generator to the electrical grid.⁸
5. Hardwired Trip Inputs: It reads signals from hardwired safety devices, such as emergency stop pushbuttons, which directly bypass some electronic controls to initiate an immediate trip by de-energizing a ⁹$24\text{ V DC}$ protection bus that feeds the PTR and ETR relays.¹⁰

🛠️ Board Specifications

The $\text{DS200TCTGG1A}$ board is physically characterized by its components, which facilitate its high-speed switching and interface roles:

• Relays: It is typically populated with 21 plug-in relays (prefixed with ‘K’, e.g., K1, K2, etc.).¹¹
• Connectors: It features several high-density connectors, including three 50-pin connectors and two 12-pin connectors, used for communication with the core processors and terminal boards (¹²$\text{TBQA}$, ¹³$\text{PTBA}$, etc.).¹⁴
• System Location: It is generally located in a specific slot (often position 4) within the Mark V control system core cabinet.¹⁵

The naming convention indicates:

• DS200: GE Mark V DS200 series board.¹⁶
• TCTG: The functional acronym for Turbine Trip Board.
• G1A: Denotes the specific design revision of the hardware.