Research And Design Of Testing System For Turbine Supervisory Instrumentation

Turbine, as important large-scale rotating machinery in the thermal power plants, is the key position in the production chain. It has very high requests to the security and dependability. In order to protect the normal operation of turbine, turbine supervisory instrumentation (TSI) is increasingly and widely used in the turbine-generator units'protection. So, the reliability of supervisory instrumentation is a large extent to determine the operation of steam turbine group. At present, the periodic check of TSI card need to disassemble parts and sent to a laboratory to carry out, and also must use a specific manufacturer of equipment. It causes extension of steam turbine downtime, and affects the power plant's normal running time. The Institute of Computer Application of University of Jinan and ShanDong LuNeng control engineering limited company jointly developed the Predictive Maintenance Device of Turbine-generator Shaft. The equipment can understand the operation status of turbine-generator in multi-directional, real-timely or historically. It collects signals from TSI. On the basis of this device and add the appropriate hardware and re-development software. Maintain the original function of predictive maintenance device of turbine-generator shaft, design and development a testing system for TSI with visual interface and on-site detection TSI card.First, this thesis introduces relevant content about Predictive Maintenance Device of Turbine-generator Shaft. Through the in-depth research and analysis the characteristics of turbine-generator shaft sensor signals and signal acquisition and analysis methods, summarized up TSI testing system needs of the various signals of the turbine shaft, and gives methods of simulate implementation to the testing system require signals. On this basis, the overall structure of the system is designed. Then a hardware platform of digital testing system for turbine supervisory instrumentation is built up.The software framework of system is designed by the use of modular design method. It means designing system first, and then dividing the task module and compiling the flow chart of the task until the end of the programming, finally realizing by programming. Concrete realization of system software includes two parts, the epigynous machine and hypogynous machine. The epigynous machine software provides a visual human-machine interface, and users can accomplish the editing and pre-analysis of signal that the testing needs, send and receive signal, test data storage capabilities. The signal pre-analysis uses some algorithms, such as FFT, etc. According on the final test signals generated by epigynous edit, the hypogynous machine software drives circuit to generate simulated signal, such as vibration signal, speed signal, displacement signal, etc. In view of the network communication between the epigynous machine and hypogynous machine, corresponding communication protocol is designed, and realized via Winsock and Packet Driver.The basic functions of the system have been completed and can be used to test TSI card. It has a high value for practice.