IS220TTURH1C - Terminal Board

SPECIFICATIONS

Part Number: IS220TTURH1C
Manufacturer: General Electric
Series: Mark VIe
Product Type: Terminal Board
Size: 33.0 cm high x 17.8 cm , wide
Technology: Surface mount
Number of outputs: Generator breaker coil, 5A at 125 V dc
Power supply voltage: Nominal 125 V dc to breaker coil
MPU pulse rate range: 2 Hz to 20 kHz
Repair: 3-5 days
Availability: In Stock
Country of Manufacturer: United States (USA)

Functional Description

IS220TTURH1C is a Terminal Board developed by General Electric. It serves as a central hub for various inputs and outputs, facilitating precise monitoring and control of the turbine. It is specifically designed to handle various inputs and outputs related to turbine control. Its role in ensuring turbine speed, voltage monitoring, main breaker control, safety mechanisms, and redundancy is paramount for the safe and efficient operation of turbines in a range of industrial applications.

Features

• Pulse Rate Devices: Equipped to handle inputs from 12 pulse rate devices. These devices are responsible for sensing a toothed wheel to measure the turbine's rotational speed. This information is crucial for monitoring and controlling the turbine's operational speed.
• Voltage Signals: The board receives generator voltage and bus voltage signals taken from potential transformers. These signals provide essential data for voltage monitoring, ensuring the generator operates within safe voltage levels.
• Main Breaker Coil Control: Offers a 125 V DC output that is used to control the main breaker coil for automatic generator synchronization. This feature is essential for ensuring the safe and synchronized operation of the generator.
• Shaft Voltage and Current Sensors: Inputs from shaft voltage and current sensors are received by the board. These sensors play a critical role in measuring induced shaft voltage and current, which is vital for the turbine's health and safety monitoring.
• Overspeed Trip Signals: Handles three overspeed trip signals that are sent to the trip board. These signals serve as a safety mechanism to detect and respond to turbine overspeed conditions.
• Additional I/O Signals: In addition to the overspeed trip signals, the board accommodates various other input and output signals from the trip board, expanding its role in monitoring and controlling the turbine's operation.
• Relay Control: Incorporates three relays, namely K25, K25P, and K25A. These relays are interlocked, meaning all three have to close simultaneously to provide the necessary 125 V dc power to close the main breaker 52G. This interlocking mechanism ensures a safe and synchronized process when closing the main breaker.
• Signal Handling for Simplex and TMR Systems: For simplex systems, the signals are directed to the PR3 and JR4 connectors. However, in TMR (Triple Modular Redundancy) systems, the signals are distributed across multiple connectors. This configuration includes PR3, PS3, PT3, JR4, JS4, and JT4 connectors. TMR systems provide enhanced redundancy and fault tolerance, crucial for critical applications such as turbine control.

Installation

1. Terminal Block Connection: Designed to handle connections from pulse rate pickups, shaft pickups, potential transformers, and the breaker relay. These components are wired to two terminal blocks, TB1 and TB2. Each terminal block is securely fastened with two screws and offers 24 terminals capable of accepting wires up to #12 AWG. Properly secure and organize the wires on these terminal blocks.
2. Shield Terminal Strip: Immediately to the left of each terminal block, a shield terminal strip is attached to the chassis ground. Ensure that the shield connections are correctly made to minimize electromagnetic interference (EMI) and maintain the integrity of the signals.
3. Jumper Selection: Jumpers JP1 and JP2 are responsible for selecting the system's operating mode, whether it is simplex or TMR (Triple Modular Redundancy). Configure these jumpers accordingly based on your system's requirements. In simplex mode, select the appropriate jumper positions to ensure the relay drivers K25 and K25P function as needed for the system. For TMR systems, ensure that the jumpers are correctly positioned to enable the redundancy and fault tolerance required for reliable operation.
4. Control Line Isolation: If necessary, removing wire jumper WJ1 isolates the K25A control line to the TRPX board. This step may be required for specific configurations or diagnostics.
5. TTL Connections (Optional): If your system requires TTL connections to active speed pickups, TB3 is designated for this purpose. These devices typically require an external power supply to function properly. Ensure that the connections are made securely and that the power supply is properly set up if needed.
6. Cable Connector Selection: Equipped to support both simplex and TMR systems, and it uses various cable connectors accordingly. In Simplex Systems, Utilize the cable connectors PR3 and JR4 for connecting the board to the system. Ensure that these connectors are securely fastened. In TMR configurations, all six cable connectors must be used. These connectors, which include PR3, PS3, PT3, JR4, JS4, and JT4, are crucial for the redundancy and fault tolerance that TMR systems offer.

Shaft Voltage AC Test and Sensor Inputs

• The turbine control system, often utilized in the Mark VIe system, incorporates various tests and sensor inputs to ensure precise monitoring and control of critical components like shaft voltage and current, generator and bus voltages, and generator breaker circuits. These tests and inputs contribute to the efficient operation and safety of the system. Let's delve into the details of these components:
• Test Voltage Application: A test voltage with a frequency of 1 kHz is applied to the input of the PTUR shaft voltage circuit, which is primarily part of the R module. This test voltage serves as a diagnostic measure to assess the integrity and functionality of the shaft voltage circuit.
• Shaft Current Measurement: The system measures shaft current in amperes AC. This measurement is performed using a shunt voltage, with peak-to-peak voltage levels of up to 0.1 V. Accurate measurement of shaft current is crucial for assessing the health and safety of the turbine.
• Potential Transformer Outputs: The system utilizes two single-phase potential transformers with secondary outputs supplying a nominal 115 V rms. These sensors are essential for monitoring generator and bus voltages. The reliable measurement of voltage levels is vital to ensure the safe operation of the generator.
• Loading and Isolation: Each input from these sensors imposes a loading of less than 3 VA. Additionally, each PT (Potential Transformer) input is magnetically isolated with a 1,500 V rms barrier, ensuring the safety and integrity of the measurement process.
• Cable Length: The system accommodates cable lengths of up to 1,000 feet, utilizing 18 AWG wiring for these sensor connections. This extended cable length capability provides flexibility in installation and system configuration.
• Voltage Range and Interruption: External circuits connected to the generator breaker should operate within a voltage range of 20 to 140 V dc. These external circuits must include an NC (normally closed) breaker auxiliary contact capable of interrupting the current. These criteria are essential for synchronizing the generator.
• NEMA Class E Rating: The circuits are rated for NEMA Class E creepage and clearance, ensuring that they adhere to industry standards for safety and performance in high-voltage applications.
• Interposing Relays: For 250 V dc applications, interposing relays are required to facilitate safe and efficient voltage interruption. These relays play a vital role in ensuring that the interruption process is controlled and reliable.
• Contact Voltage Sensing: The contact voltage sensing mechanism is used to indicate high and low voltage states. A voltage of 20 V dc indicates a high voltage condition, while 6 V dc indicates a low voltage condition. This mechanism is crucial for real-time monitoring and control of the generator breaker circuits.
• Optical Isolation and Filtering: Each circuit is optically isolated and filtered for a duration of 4 ms. These measures enhance the reliability and precision of the voltage monitoring and interruption processes.

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FREQUENTLY ASKED QUESTIONS

What is IS220TTURH1C?
It is a Terminal Board developed by General Electrics.

How does the board measure turbine speed?
The board is equipped to handle inputs from 12 pulse rate devices that sense a toothed wheel, allowing it to accurately measure the turbine's speed.

What voltage signals are monitored by the board?
It is responsible for monitoring generator voltage and bus voltage signals, which are obtained from potential transformers. These signals are essential for turbine operation and safety.

How does the board support automatic generator synchronizing?
The board provides a 125 V dc output to control the main breaker coil for automatic generator synchronizing, ensuring a safe and synchronized operation of the generator.

What sensors are used to measure shaft voltage and current?
Inputs from shaft voltage and current sensors are integrated into the board to measure induced shaft voltage and current, contributing to the monitoring and safety of the turbine.