Study On Data Acquisition And Analysis Of Steam-generator Condition Monitoring System

This paper introduced the problems of Steam turbine generator condition mon itoring and fault diagnosis system. To resolve these problems, many research work on hardware and software have been done.This article introduced the characteristics of different type of signal used in S team turbine generator condition monitoring and fault diagnosis system. Because o f different type of signal needs different processing, the requirements of each type of signal processing were specified. In order to achieve the target of signal proc essing, the research work based on the principle of hardware circuit work and ant i-interference theory in hardware includes:(1) Choice the components of hardware circuit and sensor;(2) Design different hardware signal processing circuit for diff erent type of signal;(3) Apply electromagnetic compatibility, signal filter, shieldi ng and other anti-interference measures to eliminate the noise in PCB design.(4) Choice a data according acquisition card according to the sampling frequency and the number of signals.In addition, the research work in software has also been done, which include s:(1) Write a program to set the sampling frequency and working style, due to a nalysis requirements of monitoring system.(2) Eliminate the noise of different typ e of signal with advanced mathematical algorithm.(3) Design zero phase digital fi lter to remove the high frequency signal and keep the correct phase information f or vibration signal.(4) Write program for data acquisition and signal analysis and realize display function of the system.To achieve the research target, the hardware circuit boards were designed wit h Protel software after simulation experiments with Mulisim software which is des igned for hardware circuit simulation. To achieve an effect processing result, Matl ab and Delphi were used in signal processing. The algorithm used for signal proc essing is tested by simulation experiments with Matlab before patting into enginee ring practice through Delphi programming software. What’s more, according to the existing theory of speed measurement, two counters existing in the DAQ2205car d were used to realize the correct speed measurement of steam turbine, which si mplified the measurement system.Finally, an equipment of steam turbine generator condition monitoring and di agnosis system was designed and put into engineering practice, which achieved a good effect. This equipment plays a great important role in steam turbine generato r condition monitoring and diagnosis system.