Portable vibration analyzer in the application of wind power industry

The application of portable vibration analyzer in wind power industry - 2020 06 - 04 wind power as a kind of clean and mature renewable energy, in our country and the world economy development in the direction of low carbon environmental transformation plays a more and more important role in the process. In recent years under the joint efforts of government and policy guidance and wind practitioners wind power installed capacity in China has become the global first, goldwind, vision, and so on several switchboard manufacturers have been one of the top in the world. Rapid development of wind power at the same time, more and more wind farms operators all feel the pressure of the cost of operations, is keen to reduce operational costs, which push the fan running maintenance continuously in the direction of the intelligent and professional development. As a portable vibration analyzer based on the analysis of the vibration state detection instrument, the fan missile d etection and inspection work plays an important role. Based on vibration signal of the condition monitoring of mechanical equipment state monitoring is to point to by running the state in the process of signal acquisition device, combined with the historical trend of the state and maintenance of equipment operation condition, the state of signal processing, analysis, extract the key features, diagnosis, comprehensive testing of the current state of normal, warning, alarm and risk assessment conclusion, ensure to maximize the service life of equipment. Usually can be used as the parameters of the device status signal has the vibration, noise, temperature, pressure, oil and so on, compared with several other parameters of vibration signal can feedback device status information is the most comprehensive and easy to understand and effectively, and the vibration signal acquisition process is extremely convenient. Vb7 portable vibration analyzer introduced Vb7 portable vibration analyzer ( As shown in figure 1) By the American GE bently corporation production and manufacturing, its powerful performance analysis, humanized design concept, rich function configuration deeply domestic and foreign testing maintenance personnel. Figure 1 Vb7 portable vibration analyzer physical figure Vb7 main technical parameters of portable vibration analysis instruments: 2 channels real-time synchronous acquisition data; Support speed and phase measurement of tachometer and key phase input; Based on analysis of the vibration of the Windows and management software; Waveform and spectrum collected at one time; Average measurement, suitable for dc component eddy current sensor measurement; Have hit test function to test the component frequencies; Have opened, parking, Ascending and descending speed) Tracking collection; Have long time domain waveform acquisition automatically, achieve accurate online functions; Standard configuration for the acceleration sensor: 100 mv/g sensitivity, frequency corresponding to zero. 4Hz~13000Hz； Measuring range: ( Great dynamic measurement range), ； 400, 800, 1600, 3200, 6400 line FFT high resolution; Vb7 parameter configuration completely meet the wind turbine transmission chain including all generators, gear box and main state detection. Users can according to the test object detection current status and causes of choose to use a channel sensor or two sensor for signal acquisition, usually without special requirement, convenience to use a channel sensor which can meet the test requirements; With two channels at the same time, and can do phase analysis, more intuitive judgment problem, such as the generator and the gearbox high-speed shaft at both ends of the tests suggest using two sensors testing analysis of both ends in the same direction at the same time. Case on case background: a wind field 15 # fan we feedback the wind field on the gearbox high-speed stage blade side bearing glue processing, abnormal gearbox vibration level and high speed bearing is running of the outer ring fault, ask our company to the gear box to conduct a comprehensive inspection. On June 28, 2017, our professional and technical personnel to carry Vb7 portable vibration analyzer for detection, transmission chain for the vibration of the fan site according to the test result is grade feedback the gearbox high-speed motor side bearing inner ring fault, gear box fault, not run laps before the generator bearing fault clearly advise clients. Bearing fault characteristic frequency spectrum diagram as shown in the figure below: figure 2 side V to the acceleration of the level of high-speed motor frequency domain tutu level 3 high-speed motor V to the demodulation spectrum in frequency domain graph vibration testing after the completion of the outage, open levels parallel depending on hole cover with endoscopic detection high-speed motor bearing found in bearing bearing ring pitting large area as shown in figure 3. 3, with a feeler gauge to test the high-speed stage blade side bearing hole, 0. 03 silk feeler can't into the bearing hole. Comprehensive analysis shows that the vibration test result is correct. Figure 4 bearing inner marks and dendrogram of portable vibration analyzer popularization is of great significance for the missile d etection of the fans, inspection, but the actual operation process need personnel under the fan running start state of vibration signal acquisition, the risk coefficient is relatively, and is conditioned by the weather, because of its nature, offline detection in the process of the actual analysis need according to the operation of the fan site condition, temperature, pressure and other parameters, fan operation time and parts replacement maintenance and so on to the comprehensive judgment. （ Source: nanjing AnWeiShi transmission technology co. , LTD. )