TSI is is a crucial means of monitoring and protecting the safe operation of turbines. It continuously, accurately, and reliably monitors key parameters during the startup, operation, and shutdown processes of a turbine. When the monitored parameters exceed the limits, it can promptly and accurately issue alarms or shutdown signals to the ETS system. The TSI system can also output standard 4 to 20 mA signals for monitoring purposes.
Main Functions
· System adjustment: Small size, compact structure, easy to integrate other equipment, effectively saving installation space
Speed control, simultaneous grid connection, valve control mode, power control mode, pressure control mode, CCS mode, decoupling mode, primary frequency regulation
· Limit control: Overspeed limit (103% n0 ), valve position limit, high load limit, low main steam pressure limit
· Protection control: Overspeed protection (110% n0 )
· System testing: Overspeed test, OPC fast-closing valve test, offline simulation test, leakage test
Turbine Control System Overview
Introduction
As the three necessary systems for turbine control, DEH is mainly responsible for controlling the startup, speed increase, operating under load and load regulation of the turbine to ensure stable operation of a turbine unit. ETS is mainly responsible for automatically and quickly cutting off the steam intake of a turbine when a fault occurs to protect the unit. TSI can continuously, accurately and reliably monitor the important parameters of turbine startup, operation and shutdown through sensors. When the monitored parameters exceed the limit, it can accurately and timely reports alarms or shutdown signals.
Features and Advantages
· Intelligent Velocity Measurement: The DEH special speed measurement module (3 out of 2) adopts the latest all-digital circuit, which can generate primary frequency regulation quantity, and cooperate with the servo module to complete the fast primary frequency control function.
· Efficient Configuration: With built-in fast DP (redundant) bus and CAN (redundant) bus, the primary frequency control function adopts independent high-speed CAN bus fast communication loop technology, featuring quick response.
· Intelligent Servo: The DEH special servo module adopts the latest all-digital circuit, and cooperates with the DEH special speed measurement module to complete the fast primary frequency control function through the CAN bus.
· Redundancy and Reliability: Servo module adopts redundancy configuration. Any servo channel can realize online redundant hot standby, and can automatically switch to the standby module when it is judged that the working module is faulty, and the switching time of the servo module is ≤ 10 ms. Servo valve adopts redundancy configuration. Two servo valves receive command signals at the same time to drive the oil motive to act. When one of the servo valves is determined to be faulty, a closure command is issued to the lockout valve of that servo valve. Subsequently, the remaining servo valve takes over all operations while an isolation electromagnetic valve is actuated to cut off the oil flow. Additionally, a shut-off valve on the oil line is used to isolate the fault point for maintenance, ensuring the continuous operation of the unit.
· Quick Master Control: The minimum IEC operating period of the controller is 10 ms, which can meet the rapidity requirements of ultra-supercritical units.
· Fast Frequency Regulation: With qualified primary frequency regulation capability, DEH can make the regulation period lower than 30 ms (non-control period).
· High-Performance Hydraulic Control: The hydraulic control system utilizes an independent high pressure 14 MPa control oil source, and the control of the oil actuated motor is integrated into the servo control system. This hydraulic control system is capable of achieving an oil actuated motor response time of less than 0.3s.
Applicable Model
Technical Parameters
· Speed adjustment range: Turning gear speed at 120% of rated speed
· Speed measurement accuracy: ≤ ±1 r/min Load control range 0 to 120%, accuracy 0.5%
· Speed variation ratio: Continuously adjustable within a range of 3 to 6%
· Control system insensitivity: < 0.06%
· Maximum overspeed at full load: < 7% of rated speed and able to maintain idling
· Steam extraction pressure control accuracy: ±0.01 MPa (suitable for C/CC units)
· Steam extraction pressure unevenness: 0 to 20%
· System control cycle: < 50 ms
· Minimum IEC operating cycle: 10 ms
· Anti-interference measure: Resistance to interference from various electromagnetic waves and communication devices on site, complying with IEC61131-2 and IEC61000-4 standards.
Related Products
Digital Electro-Hydraulic System (DEH)
Emergency Trip System (ETS)
Company Profile
Audited Supplier 
Main Functions
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