DS200TCEAG2BLE - Emergency Overspeed Board

SPECIFICATIONS

Part Number: DS200TCEAG2BLE
Manufacturer: General Electric
Country of Manufacture: United States (USA)
PCB Coating: Normal
Repair: 3-5 Days
Series: Mark V
Function: Emergency Overspeed Board

Functional Description

DS200TCEAG2BLE is an Emergency Overspeed Board developed by GE. It is part of the GE Speedtronic Mark V control system. It is commonly referred to as the Protective Processor and is located within the Protective Core (P1). The TCEA board handles critical safety functions, including turbine overspeed detection, flame detection, and automatic synchronization.

Key Components and Functionality

• Processor Modules: The three boards within the (P1) core are designated as X, Y, and Z processors. Each processor handles signals related to high and low shaft speeds, flame detection, and automatic synchronization. Data from each board is communicated to the STCA board in the (R1) core over the IONET via connectors on the TCEA boards.
• Data Communication and Redundancy: The three TCEA boards communicate data to the I/O Engine in the (R1) core.
  Data is median-selected for accuracy, and results are transferred across the COREBUS to the Control Engine. Emergency trip signals are transmitted from the TCEA boards to the Turbine Trip Board (TCTG) for a 2-out-of-3 voting system that initiates a trip if necessary.
• Power Supply and Diagnostics: Each TCEA board has an independent power supply with built-in diagnostics to ensure reliable operation.

Connectors and Signal Flow

• J7 Connector: Distributes power from the (PD) core to each TCEA board.
• JK Connector: Transports signals from the TCEB board in the (P1) core to the TCEA boards. These signals are processed through the Protection Termination Expander Board, which links all incoming signals to the TCEA boards.
• JL Connector: Carries trip signals to the Turbine Trip Board (TCTG) in the (P1) core, with each TCEA board linked to a specific connection (JLX, JLY, or JLZ).
• JW Connector: Transports 335V DC power for flame detection to the TCEB board, connecting flame detectors to the TCEA boards.
• JX1 and JX2 Connectors: Serve as IONET daisy-chained connectors for communication, transferring signals across boards in the (P1) core to the TCQC board in the (R1) core.

Configuration

Hardware Configuration

• Jumpers: Specific hardware jumpers on the TCEA board, including J1, J31, J4, J5, and J6, are used to configure the IONET address and set up termination resistors.
• Overspeed Settings: High and low-pressure shaft overspeed trip frequencies are adjusted via hardware jumpers (J12-J27).
• Redundancy Setup: Jumpers J28 and J29 on the (Z) board configure it to always vote for an emergency overspeed trip, establishing a dual-redundant system.

Software Configuration

• The IO Configuration Editor defines base speed, overspeed limits, and trip frequency settings.
• The flame detector pulse rate and synchronization permissive values are also configured through this software.

Flame Detection Circuit

UV flame detectors send signals through the PTBA board, which are then routed to the TCEB board and subsequently to the board. These signals are scaled, conditioned, and analyzed to determine flame presence. The Control Sequence Program (CSP) in the (R) core utilizes these signals, which are also sent to the I/O Engine and Control Engine for monitoring.

Turbine Overspeed Circuit

Overspeed trip levels are defined through I/O configuration constants and confirmed with hardware jumpers. Magnetic pickups on the PTBA board monitor shaft speed and send data to the (R1) core, while the board calculates shaft speed and compares it to the trip values. If overspeed is detected, the board de-energizes Emergency Trip Relays (ETRs) on the TCTG board to initiate a trip. Jumpers J28 and J29 ensure redundancy, enabling a dual system for emergency trip conditions.

Automatic Synchronization Circuit

Bus and generator voltage signals from the PTBA board are routed to the TCEB board and then to the board for speed and voltage matching. The TCEA board calculates generator and line voltage/frequency differences to permit breaker closure when conditions are met. An additional synchronization check is performed by the STCA board, which sends a logic signal to the board, completing the synchronization process.

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FREQUENTLY ASKED QUESTIONS

What is DS200TCEAG2BLE?
It is an Emergency Overspeed Board and is part of the GE Speedtronic Mark V gas turbine control system.

How is emergency overspeed protection achieved?
The board monitors shaft speeds and compares them with configuration constants for overspeed limits. If an overspeed condition is detected, the board will de-energize the Emergency Trip Relays (ETRs) on the Turbine Trip Board (TCTG), initiating a unit trip.

How does the flame detection system work on the board?
UV flame detector signals are routed to the board through the PTBA and TCEB boards. These signals are then scaled, conditioned, and analyzed to determine flame status, which the system uses to support safe operation.

How does the board facilitate automatic synchronization?
The board receives generator and bus voltage data, checks for speed and voltage matching, and issues a breaker-close permissive if conditions are within safe limits. The STCA board also performs a secondary synchronization check for additional safety.