SPECIFICATIONS
Part No.: IS215VPROH1BE
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Number of Inputs: 4 - 20 mA
Number of Outputs: 6
Power Supply Voltage: 125 V dc
Thermocouple types: E, J, K, S, T
Span: -8 mV to +45 mV
Common Mode Voltage Range: ±5 V
Dimensions: 16.51 cm High x 17.8 cm
Operating temperature: 30 to 60 °C
No.of Analog Voltage Inputs: 6
Product Type: Turbine Protection Board
Availability: In Stock
Series: Mark VI
Functional Description
IS215VPROH1BE is a Turbine Protection Board developed by GE. It is a part of Mark VI control system. This board control the operation of electro-hydraulic servo valves, which are responsible for actuating steam and fuel valves in a variety of industrial applications, particularly in power generation systems. The VSVO (Servo Control) Board is a key component in ensuring precise control, monitoring, and regulation of valve positions, which is essential for optimal system performance and efficiency.
Components and Functions
- Electro-Hydraulic Servo Valves: The board is tasked with controlling four electro-hydraulic servo valves. These valves regulate the flow of steam or fuel through the system's control valves, directly influencing the operation of critical equipment such as turbines. The precise control of these valves is essential for maintaining the correct pressure, temperature, and flow rates, which are necessary for safe and efficient system operation.
- Linear Variable Differential Transformers (LVDT): For accurate valve position measurement, it incorporates Linear Variable Differential Transformers (LVDT). LVDTs are highly precise sensors used to measure the position of the valve stems. These sensors convert mechanical movement into an electrical signal, allowing the system to continuously monitor the position of the valves. This feedback is essential for maintaining accurate control and ensuring the valves are operating within their specified parameters.
- Position Loop Control Algorithm: A key feature of the VSVO board is its integration of a position loop control algorithm within its firmware. This algorithm is responsible for dynamically adjusting the position of the servo valves to ensure optimal performance. It continuously processes input from the LVDTs and adjusts the servo valve position accordingly to maintain precise control over the system. By adjusting the servo output in real-time, the system can compensate for any deviations, ensuring consistent performance and minimizing errors.
- Hardware Current Regulator: The board includes a hardware current regulator designed to maintain a stable servo output current. This regulator ensures the system delivers a consistent, reliable current to the servo valves, which is essential for proper valve actuation. By maintaining a stable current, the system avoids fluctuations that could result in inaccurate valve positioning or unstable operations. This component enhances the overall reliability and longevity of the servo control system.
Connectivity
- The front panel of the board is equipped with a J5 plug, which allows for communication with external systems or components. One of the three cables connecting to the board is routed to this plug, enabling data exchange and facilitating external monitoring or control. This connectivity is important for integrating the servo control system into larger control architectures and enabling real-time communication with other system components.
- The board features two additional cables that connect to the J3 and J4 connectors on the backplane. These connectors provide the internal communication pathways between the VSVO board and other components within the Mark VI control system. Through these connections, the board integrates seamlessly into the larger control infrastructure, enabling synchronized operation with other systems and components.
Terminal Boards
- The board controls four servo valve channels, and these channels are divided between two types of terminal boards: TSVO (Terminal Servo Valve Output) and DSVO (Dual Servo Valve Output). The TSVO board connects to the VSVO board and facilitates the final output signal sent to the servo valves, controlling their operation based on the feedback from the system.
- The design of the board allows for flexible system configuration. Each VSVO board can be connected to two TSVO terminal boards, which expands the ability to control multiple channels. Furthermore, each TSVO terminal board can accommodate connections from up to three VSVO boards, enabling scalable and adaptable system configurations. This flexibility is especially important in complex systems that require multiple control channels or the ability to expand the control infrastructure as system needs to evolve.
Installation
- Slide in the Board: Gently slide the board into the designated slot within the VME I/O processor rack. Ensure that the board aligns correctly with the slot to prevent any damage. Once in position, use both hands to push the top and bottom levers towards the board, which will securely seat the edge connectors of the board into place. This step is crucial for establishing a proper electrical connection between the VPRO board and the rack.
- Tighten the Captive Screws: After the board is properly seated, secure it by tightening the captive screws located at the top and bottom of the VPRO board's front panel. These screws will lock the board in place, preventing any movement that could lead to connection issues. Ensure that the screws are tightened firmly, but avoid over-tightening, which could cause damage to the board or rack.
- Power Up the VME Rack: Once the board is securely installed, power up the VME rack. This action will initiate the operation of the board and allow for diagnostic checks. After powering up, monitor the diagnostic lights located at the top of the front panel of the VPRO board. These lights will indicate the status of the board and help confirm that the installation was successful. Ensure that all indicators show normal operation, and if there are any irregularities, check the connections and re-assess the installation steps.
Operation
- It safeguards the turbine from overspeed conditions. It does so by continuously monitoring turbine speed and providing immediate shutdown if the turbine exceeds predefined speed thresholds. This function is essential for preventing damage to the turbine due to excessive rotational speeds, which could otherwise lead to severe mechanical stress and failure.
- In addition to overspeed protection, the VPRO board is equipped with backup synchronization check protection. This feature ensures that the turbine's synchronization with the grid or other power systems remains within safe operating parameters. If synchronization is lost or if there is a discrepancy, the VPRO board can trigger a shutdown or corrective action, protecting the system from potential damage caused by unsynchronized operations.
- The board is designed to handle three analog current inputs. These inputs provide real-time monitoring of various electrical parameters in the system, such as current flow in critical components. These readings help ensure that the system operates within normal limits, and any deviations can be flagged for corrective action.
- The board is equipped with nine thermocouple inputs, which are primarily intended for exhaust over-temperature protection in gas turbines. These inputs measure the temperature of the exhaust gases, a critical parameter for ensuring the turbine's safe operation. If the exhaust temperature exceeds predefined thresholds, the VPRO board can trigger an alarm or initiate a shutdown sequence to prevent overheating, which could lead to component damage or failure.
The WOC team is always available to help you with your Mark VI requirements. For more information, please contact WOC.
Frequently Asked Questions
What is IS215VPROH1BE?
It is a Turbine Protection Board developed by GE under the Mark VI series.
How does the board protect the turbine from overspeed?
The board continuously monitors the turbine’s rotational speed. If the turbine exceeds predefined speed limits, the board activates an emergency shutdown to prevent damage due to excessive speed.
What is the role of the analog current inputs on the board?
The three analog current inputs on the board monitor critical electrical parameters within the turbine system, such as current flow. These readings help detect anomalies and ensure that the system operates within safe electrical limits.
What are thermocouple inputs used for in the board?
The board includes nine thermocouple inputs to monitor exhaust temperatures in gas turbines. These inputs provide crucial temperature data, and if the exhaust temperature exceeds safe limits, the board can initiate an alarm or shutdown to prevent overheating.
How many VPRO boards are typically required for turbine protection?
The protection system typically requires three VPRO boards to ensure complete emergency overspeed protection and other safety functions, such as synchronization checks and temperature monitoring.
