Description
Functional Features Turbine Protection Function: It is a turbine protection board designed for the Mark VI system. Together with its related terminal boards (TPRO and TREG), it provides an independent emergency overspeed protection system, featuring emergency overspeed protection and emergency stop functions. Interface and Communication Function: It provides a direct interface with field devices, which helps to reduce or eliminate many intermediate tools that were previously required. It simplifies long-term maintenance and eliminates fault points in the system. It also offers direct diagnostics for direct monitoring of field devices. In addition, the VPRO board has an Ethernet connection for IONet communication with the control module. Speed Control and Monitoring: Six passive magnetic speed sensors are used to achieve speed control and overspeed protection. The controller monitors these sensors and uses the median signal for speed control and main overspeed protection. On the TPRO terminal board, 9 passive magnetic speed sensors or active pulse rate sensors (TTL type) are provided, among which 3 are monitored by R8, S8, and T8 VPRO respectively.
Technical Parameters Electrical Parameters: General operating voltage and other parameters need to be in accordance with the requirements of the specific Mark VI system. Usually, it is adapted to the standard voltage of the system, possibly 24V DC, etc. Input and Output Parameters: The circuit board has 2 coil outputs, 2 channels, and 2 pulse rate inputs, and provides 8 LVDTs (Linear Variable Differential Transformers). It can receive signal inputs from passive magnetic speed sensors or active pulse rate sensors for relevant calculations and judgments of speed control and protection functions. In terms of output, it is used to control relevant trip solenoid valves and other devices. Communication Parameters: If Ethernet communication is involved, it follows the relevant Ethernet communication protocol, and the rate may be commonly 10M/100M adaptive, etc. If an RS-485 communication interface is used, the communication rate can be adjusted according to the settings, and generally supports multiple communication rates, such as 9600bps, 19200bps, etc. Mechanical and Environmental Parameters: The size specification needs to be adapted to the installation requirements of the Mark VI system, and it is usually compactly designed. The working temperature range generally needs to meet the requirements of the industrial environment, possibly around 0°C - 60°C, and the storage temperature range may be -40°C - 85°C. It can withstand a certain degree of vibration and impact to ensure stability and reliability in the industrial environment.
GE IS200TSVCH1AJE is a turbine protection board designed for the Mark VI system, and its overspeed protection principle is as follows: Speed Signal Acquisition: Six passive magnetic speed sensors are used to achieve speed control and overspeed protection. The controller monitors three of these sensors and uses the median signal for speed control and main overspeed protection. In addition, on the TPRO terminal board, 9 passive magnetic speed sensors or active pulse rate sensors (TTL type) are provided, among which 3 are monitored by R8, S8, and T8 VPRO respectively. Overspeed Trip Setting: The application software has separate overspeed trip settings for the main and emergency overspeed trip limits, and at least one emergency overspeed trip limit must be programmed into the I/O configurator to confirm the EOS trip point. Composition of the Protection System: The steam turbine protection board (VPRO) and its related terminal boards (TPRO and TREG) provide an independent emergency overspeed protection system. This protection system is composed of three redundant VPRO boards and is located in a module separate from the turbine control system. Trip Control Process: When the speed detected by the speed sensor exceeds the preset overspeed trip value, the VPRO board in the protection module P will execute the emergency trip function. The VPRO board is responsible for 12 relays of the TREG, among which 9 relays are grouped into three groups with three relays in each group, and the three trip solenoid valves are controlled through voting input operations. Any VPRO board has the ability to trip the turbine, and overspeed protection is achieved by controlling the trip solenoid valve to cut off the power source of the turbine or take other braking measures.
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