IS200TTURH2C - Primary Protection Terminal Board

IS200TTURH2C - Primary Protection Terminal Board IS200TTURH2C - Primary Protection Terminal Board

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Part No.: IS200TTURH2C
Manufacturer: General Electric
Series: Mark VI
Size: 33.0 cm high x 17.8 cm wide
Technology: Surface mount
Temperature Operating: -30 to 65oC
Number of outputs: Generator breaker coil, 5 A at 125 V dc
Power supply voltage: Nominal 125 V dc to breaker coil
MPU pulse rate range: 2 Hz to 20 kHz
MPU pulse rate accuracy: 0.05% of reading
MPU input circuit sensitivity: 27 mV pk
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS200TTURH2C is an Turbine Primary Protection Terminal Board developed by GE. It is a part of Mark VI control system. Its inputs and outputs, along with the interlocking relays, enable precise measurement, monitoring, and protection of the turbine and its associated electrical components. The use of specific connectors and TMR technology further enhances the system's reliability, contributing to the efficient and safe operation of the turbine.


  • The Primary Turbine Protection Input terminal board is an essential component that works in conjunction with VTUR to ensure the safe and reliable operation of the turbine. This board facilitates various inputs and outputs, serving critical functions in the turbine system.
  • Equipped with twelve passive pulse rate devices that sense a toothed wheel's rotation to measure the turbine's speed accurately. These devices provide crucial speed feedback, allowing the control system to monitor and regulate the turbine's rotational speed within safe operating limits.
  • Receives signals from potential transformers (PTs) that measure the generator voltage and bus voltage. These signals are vital for monitoring the electrical parameters and ensuring the generator operates within specified voltage limits. The information from PTs helps in the protection and control of the electrical system.
  • Provides a 125 V DC output specifically used to energize the main breaker coil. This functionality is essential for automatic generator synchronizing, a critical process that ensures smooth integration of the generator with the power grid.
  • Accepts inputs from shaft voltage and current sensors. These sensors are used to measure induced shaft voltage and current, providing important data for monitoring the condition and performance of the turbine's shaft during operation.
  • Incorporates three relays, namely K25, K25P, and K25A. To enable 125 V DC power supply for closing the main breaker (52G), all three relays must close. This interlocking mechanism ensures a reliable and secure process for synchronizing the generator.
  • The speed signal cable connecting to VTUR uses the JR5 connector, while the other signals utilize the JR1 connector. In TMR (Triple Modular Redundant) systems, the signals fan out to various connectors, including JR5, JS5, JT5, JR1, JS1, and JT1. TMR systems provide redundancy and fault tolerance, enhancing the overall reliability of the turbine protection system.


  • Connect the wires from the magnetic pick-ups to the appropriate terminals on TB1 or TB2, depending on their location and routing requirements. Ensure that the wires are secured with the screws on the terminal block and that the shield termination strip is connected to chassis ground.
  • Connect the wires from the shaft pick-ups to the designated terminals on TB1 or TB2, based on their connection points in the figure. As with the magnetic pick-ups, secure the wires with the terminal block screws and ensure proper grounding using the shield termination strip.
  • Wire the signals from the potential transformers to the relevant terminals on TB1 or TB2, as indicated in the figure. Ensure that the wires are securely fastened to the terminal block with the screws, and connect the shield termination strip to chassis ground.
  • Use jumpers JP1 and JP2 to select the appropriate relay driver mode for K25 and K25P. Depending on whether SMX (Simplex) or TMR (Triple Modular Redundant) is chosen, configure the jumpers accordingly to connect the relays to the desired terminal blocks (TB1 or TB2). Connect the wires for the breaker relays to their respective terminals on TB1 or TB2 and secure them using the screws provided.
  • If applicable and using optional TTL active speed pick-ups, connect their wires to TB3. These pick-ups require an external power supply, so ensure that the necessary power source is connected appropriately. Secure the wires to TB3 using the provided screws.
  • Throughout the process, be mindful of wire gauges, making sure they are within the acceptable range (#12 AWG or appropriate for the terminal blocks). Also, double-check connections and ensure proper grounding to maintain the integrity and reliability of the terminal board wiring.
  • Remember to refer to the TTUR Terminal Board Wiring figure for specific terminal designations and their corresponding components. Following these steps will ensure a well-connected and properly functioning TTUR terminal board setup.

World of Controls has the most comprehensive collection of GE Mark VI components. Please contact WOC as soon as possible if you require any extra information.


Frequently Asked Questions


What is IS200TTURH2C?
It is an Turbine Primary Protection Terminal Board developed by GE

How many pulse rate signals can be used to measure turbine speed in simplex applications?
In simplex applications, up to four pulse rate signals can be utilized to measure the turbine speed accurately. These pulse rate signals are generated by sensing a toothed wheel's rotation, providing essential feedback for speed monitoring.

What are the roles of the product regarding generator and bus voltages in the turbine system?
It plays a crucial role in turbine system synchronization by bringing in generator and bus voltages through potential transformers. These voltages are essential for automatic generator synchronizing in conjunction with VTUR, the turbine controller, and the excitation system.

What does TTUR control in terms of generator synchronizing?
The component is equipped with permissive generator synchronizing relays that are responsible for managing and ensuring the synchronization process of the generator. The relays play a vital role in determining when the generator is in a suitable state for synchronizing with the power grid.