Study On Monitoring Of Hydropower Unit Vibration And Analyzing System

Along with the enhancing proportion of hydroelectricity in the whole electricity system in our country, stabilization of hydropower unit is more and more important to the whole system operation. Since vibration is the important factor that influences the security and reliability of hydropower unit, in this paper a set of online monitoring of hydropower unit vibration and analyzing system is developed on the base of studying vibration monitoring and analyzing method.Firstly, based on the actual situation of hydropower plant, the aim, meaning and content of online monitoring of hydropower unit and its application and development in and outside of the country are described, the theory, and character of turbine generator vibration some vibration are analyzed and concluded, and present testing technology is made the most use of to study the conformation of test parameters, reasonable arrangement of the test spots, choosing of sensors and A/D cards, and design of pretreatment board of online monitoring of hydropower unit vibration and testing analyzing are designed in detail.Secondly, aiming to the shortage of Fourier transform in analyzing unbalanced signal, wavelet transform is introduced to analyze vibrationsignal, example shows that wavelet analysis has excellent competence both in time and frequency region. It has good effect to combine these two methods to analyze vibration signal.At last, a set of online monitoring of hydropower unit vibration and analyzing system is developed, including IPC, A/D cards, vibration sensors and correlative modules. This system uses multicenter synchronization sampling and DMA sampling control method, which has high sampling frequency. The system can realize displaying and analyzing in real time. On the base of hardware, a set of vibration monitoring and analyzing software is developed using Object Oriented Programming method, which includes online monitoring module, signal module and database module.