GE DS200TCEAG1BKE Emergency Overspeed Board

The DS200TCEAG1BKE is an Emergency Overspeed Board (TCEA) manufactured by GE Energy as part of the Mark V™ Turbine Control System. This board is located in the Protective Core (<P1>) and is commonly referred to as the Protective Processor. It is a dedicated safety module responsible for high‑speed protection circuitry on gas and steam turbines. The DS200TCEAG1BKE provides independent overspeed monitoring, flame detection, and automatic synchronisation functions, ensuring deterministic trip responses that are independent of the main control processor.

In a standard Mark V protection core, three TCEA boards are used and designated as the X, Y, and Z processors. The DS200TCEAG1BKE can be configured to assume any of these roles (X, Y, or Z) through hardware jumpers and IONet address settings. The board receives signals for high‑speed and low‑speed shaft rotation, ultraviolet (UV) flame detection, and automatic synchronisation (bus and generator voltage and frequency). These signals are scaled, conditioned, and transmitted over the IONet to the STCA board in the <R1> core via daisy‑chained JX1/JX2 connectors.

The DS200TCEAG1BKE also generates emergency trip signals that are sent to the Turbine Trip Board (TCTG) in location four of the <P1> core. Each TCEA board drives different relays on the TCTG, which perform a 2‑out‑of‑3 vote (relay driver level voting) to determine whether the unit trips. The board has its own power supply with dedicated diagnostics.

The suffix BKE indicates a specific revision and factory configuration (including component selections, coating, and firmware) that maintains full backward compatibility with all Mark V systems while incorporating the latest design enhancements.

Functional Description

Based entirely on the attached document, the DS200TCEAG1BKE performs the following primary functions:

• Turbine Overspeed Protection – It receives shaft speed signals from magnetic pickups (MPUs) via the PTBA terminal board and the TCEB Protection Termination Expander board. The TCEA calculates shaft speed using I/O configuration constants and compares the computed speed with programmed trip setpoints. If an overspeed condition is detected, the board de‑energises the Emergency Trip Relays (ETRs) on the TCTG board, causing a turbine trip. Hardware jumpers J28 and J29 on the Z processor can force the board to always vote for a trip, creating a dual‑redundant emergency overspeed system (a trip from either X or Y will trip the unit).

• Flame Detection – Signals from UV flame detectors are brought into the PTBA board, then routed to the TCEB board via JVA and JU connectors. The TCEB transfers these signals to the TCEA through the JK connector (JXK, JKY, or JKZ). The DS200TCEAG1BKE scales and conditions the signals, calculates flame intensity using internal algorithms, and determines flame status. This data is sent over the IONet to the Control Engine. The board also supplies 335 V dc to power the flame detectors via the JW connector.

• Automatic Synchronising – The bus and generator voltages from the PTBA terminal board are sent through the JV connector to the TCEB board, which forwards them to the TCEA via the JMP connector. Embedded software in EPROMs on the DS200TCEAG1BKE performs speed matching and voltage matching. After verifying proper generator and line voltages, frequencies, and that the differential is within configurable limits, the board sends a permissive signal to close the breaker. A separate synchronisation check from the STCA board must also be satisfied to enable breaker closure.

• IONet Communication – The DS200TCEAG1BKE communicates over the IONet via daisy‑chained JX1 and JX2 connectors. The X processor’s JX1 connects to the TCQC board in <R1> core, and subsequent boards are chained through JX2 to JX1. All signals from the <P1> core and digital I/O from the <Q11> core are read/written to the I/O Engine in <R1>.

Hardware Characteristics

Physical Form Factor and Mounting

The DS200TCEAG1BKE is a printed wiring board designed for installation in the Mark V control rack within the Protective Core (<P1>). It uses standard VME‑style connectors and is secured by faceplate screws.

Connectors

Jumpers

The DS200TCEAG1BKE includes hardware jumpers for configuration:

LED Indicators

The attached document does not specify onboard LEDs for the TCEA board. Status is typically provided by the control system software and power supply diagnostics.

Installation and Configuration

Handling Precautions

• Static sensitivity – The DS200TCEAG1BKE contains static‑sensitive components. Always wear a wrist grounding strap and handle at a grounded workstation.

• De‑energise before handling – Turn off power to the control rack and verify zero voltage before inserting or removing the board.

• Do not insert or remove with power applied – May cause equipment damage or personal injury.

Installation Steps

1. De‑energise the Mark V control rack.

2. Locate the appropriate slot in the Protective Core (<P1>) for the desired role (X, Y, or Z). X is typically in location one, Y in location three, Z in location five.

3. Set the hardware jumpers:

   • J4, J5, J6 – configure the IONet address for the role (X, Y, or Z).

   • J2, J3 – install termination resistors as required by the IONet topology.

   • J8–J27 – confirm the overspeed trip frequency settings match the I/O configuration constants.

   • For a Z processor, set J28 and J29 to force emergency overspeed trip vote (if required).

   • J30 – enable stall timer as needed.

4. Slide the DS200TCEAG1BKE into the card guides and press firmly to seat the backplane connectors.

5. Secure the faceplate screws.

6. Connect the cables:

   • J7 – power from <PD> core.

   • JK – to the corresponding JXK/JKY/JKZ on the TCEB board.

   • JL – to the corresponding JLX/JLY/JLZ on the TCTG board.

   • JW – to the corresponding JWX/JWY/JWZ on the TCEB board.

   • JX1/JX2 – daisy‑chain to adjacent TCEA boards or to TCQC/TCDA as per system diagram.

7. Apply power and verify that the board is recognised by the ToolboxST software.

Software Configuration

Use the I/O Configuration Editor in ToolboxST to:

• Set base speed and overspeed values for high‑pressure and low‑pressure shafts.

• Calculate and confirm hardware jumper settings for trip frequency.

• Select pulse rate information from UV flame detectors.

• Choose auto‑synchronisation permissive values (voltage, frequency, differential limits).

Diagnostics and Maintenance

The DS200TCEAG1BKE provides diagnostics through its on‑board power supply monitoring and via the control system software. Key diagnostic features include:

• Power supply failure detection (per board).

• IONet communication loss (detected by stall timer).

• Overspeed trip status – which channel (X, Y, or Z) triggered.

• Flame detector signal integrity and intensity levels.

• Automatic synchronisation permissive status.

The board also includes a separate synchronisation check function from the STCA board, which must be satisfied to enable breaker closure.

No routine calibration is required. Periodic visual inspection for dust, corrosion, or loose connections is recommended.

Ordering Information

When ordering the DS200TCEAG1BKE, use the complete part number exactly as shown:

• DS200 – Mark V series.

• TCEA – Functional acronym: Emergency Overspeed Board.

• G1 – Generation/version.

• B – Base designator.

• K – Modifier (e.g., coating, component variation).

• E – Revision E.

Warranty and Order Placement

• Warranty replacements (within warranty period): Contact GE Energy Post Sales Service.

• Spare parts or non‑warranty orders: Contact your nearest GE Sales or Service Office. Provide:

  • Complete part number: DS200TCEAG1BKE

  • Turbine control system serial number

  • Material List (ML) number

Note: All digits and letters in the part number are significant. GE may substitute later compatible revisions, but backward compatibility is assured.