DS200TCEAG2BME - Emergency Overspeed Board

SPECIFICATIONS:

Part Number: DS200TCEAG2BME
Manufacturer: General Electric
Series: Mark V LM
Board rating: 125 V dc
Product Type: Emergency Overspeed Board
Impedance to the ground: 75 Ohm
Power Requirements: +5 V dc, 6 A
Operating temperature: -30 to +65�C
Size: 30.48cm High x 21.33cm
Mounting: 4 mounting Holes
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEH-6721D

FUNCTIONAL DESCRIPTION:

DS200TCEAG2BME is an Emergency Overspeed Board manufactured and designed by General Electric as part of the Mark V LM Series used in GE Speedtronic Control Systems. The Emergency Overspeed Board (TCEA), located in the Protective Core , is used for the high-speed protection circuitry and is often called the Protective Processor. The three TCEA boards used in the core are referred to as the , , and processors. These boards each bring in high and low shaft speed signals, flame detection, and automatic synchronization. The signals are scaled conditioned and written over the IONET to the STCA board in the core via the JX1 connector located on the TCEA board in location one, (). The TCEA boards in locations three, (), and five, (), transfer their information using the JX1 and JX2 connections via .

The I/O Engine in the core uses the data from the three TCEA boards and performs a median selection on the three values and the results are transferred across the COREBUS to the Control Engine. The TCEA boards send emergency trip signals to the Turbine Trip Board (TCTG), and each TCEA board sends a trip signal to different relays. The three relays on the TCTG board perform a 2/3 vote (relay driver-level voting), and the results determine whether the TCTG board trips the unit. Each TCEA board has its own power supply and power supply diagnostics.

TCEA CONNECTORS:

JK - Carries the signals to the TCEA board from the TCEB board in location two of the core. JK connects to either JKX, JKY, or JKZ connectors on the TCEB board. This board is the Protection Termination Expander Board on which all of the signals are brought in and transferred to the TCEA boards. connects to JKX, connects to JKY, and connects to JKZ.

JL - Carries the trip signals to the Turbine Trip Board (TCTG) in location four of the core. Each TCEA board connects to a different connection on the TCTG board. JL on connects to JLX, JL on connects to JLY, and JL on connects to JLZ.

JW - Carries the 335 V dc for the flame detectors to the TCEB board. JW connects to the JWX/Y/Z connectors on the TCEB board. connects to JWX, con- nects to JWY, and connects to JWZ.

JX1 - Daisy chained IONET connectors. JX1 on connects to the JX connector on the TCQC board in the core. This IONET connection reads/writes all of the core signals and digital I/O, , core signals to the I/O Engine in . JX1 on connects to the JX2 socket on allowing it to be on the daisy chain. The JX1 connector on connects to the JX2 socket on . Again this allows it to be on the daisy chain. All of the signals are carried from board to board over the daisy chain until they arrive at the TCQC board in the core.

JX2 - Daisy chained IONET connectors. JX2 on connects to the JX1 connector on . JX2 on connects to the JX1 connector on . The JX2 connector on connects to the TCDA board in the core. This allows the digital signals to follow the daisy chain up the IONET to the core.

TCEA CONFIGURATION:

Hardware: The TCEA board is hardware jumpers J1 and J31 are used for factory tests. J2 and J3 are used for IONET termination resistors. Hardware jumpers J4, J5, and J6 are used to set up the IONET address for each TCEA board. Overspeed trip frequency settings are confirmed using J12 through J21 for the high-pressure shaft J8 through J11 and J22 through 27 for the low-pressure shaft. The actual configuration is done through the I/O configuration software. J28 and J29 hardware jumpers cause to always vote for a trip on emergency overspeed. J30 enables the stall timer.

Software: The IO Configuration Editor is used to set the base speed and overspeed values for both the high and low-pressure shafts and calculate the hardware jumper settings for trip frequency. The pulse rate information from the Ultra Violet (UV) flame detectors is selected and the auto-synchronization permissive values are chosen in the IO Configuration Editor as described below.

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FREQUENTLY ASKED QUESTIONS:

How does the Emergency Overspeed Board function in the Speedtronic Mark V LM system?

The board continuously monitors the speed of the gas turbine. If the turbine exceeds a predetermined speed limit, the board activates protective measures such as shutting down the turbine, triggering alarms or initiating emergency braking to prevent damage or accidents.

Why is the Emergency Overspeed Board crucial for gas turbine safety?

Gas turbines operate at high speeds and are susceptible to severe damage if they overspeed. The Emergency Overspeed Board provides a vital safety mechanism to prevent overspeed conditions, protecting the turbine and ensuring the safety of personnel and equipment.

Can the speed limit settings on the Emergency Overspeed Board be adjusted?

Yes, the speed limit settings can be configured to meet the specific operational and safety requirements of the gas turbine. This ensures optimal performance and protection based on the turbine's characteristics and operational parameters.