Vibrating detection method for detecting looseness of large-scale generator rotor slot wedge and apparatus therefor

Abstract

The invention relates to a method for detecting the loose and vibration of stator groove wedge of large generator, which comprises: a, using controllable activator to generate exciting force to hit the tested groove wedge, to vibrate the groove wedge; b, using sonic sensor and displacement sensor to transform the sonic wave radiated by groove wedge and the vibration displacement into sonic electric signal and displacement signal; c, digitalizing the tested sonic electric signal and the displacement electric signal; d, the data processing module based on the fixing type of tested groove wedge extracts out the characteristic amount of sonic wave signal and displacement signal, to be compared with preset threshold valve, to obtain the state of tested groove wedge. The invention can support variable groove wedge fixing structure, to detect the loose of large generator quickly; and it uses software to control activated vibration, to set the activated wave shape of each grove wedge. And it can real-time detect the state of groove wedge and analyze the history data. The invention has high automatic degree, with friend interface.

Description

Technical field [0001] The invention belongs to the field of large motor insulation fault diagnosis, and particularly relates to a method and device for detecting slot wedge looseness based on vibration characteristics. Background technique [0002] With the rapid development of my country’s power industry, generators have gradually tended to large-capacity and high-voltage. Large-scale generators are an important part of the power system. Once such large-scale equipment fails, it will not only endanger the generator itself, but also the sudden accident Due to the nature of the power system, the entire power system will be blacked out and cause huge economic losses. Therefore, it is essential to ensure the safe and stable operation of all links of large generators. In the long-term operation of the large-scale generator stator bar, the slot bar generates radial electromagnetic force due to the current of the stator bar and the transverse magnetic field in the slot. The end of the...

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Problems solved by technology

Xi'an Jiaotong University and Chinese patent 02139480.6 introduced an acoustic measurement system for slot wedge looseness, which uses the change of the acoustic characteristics of the slot wedge before and after loosening to judge the looseness of the slot wedge. The wedge loose structure only relies on the acoustic characteristics to determine the degree of looseness, and its model theoretical analysis needs to be improved to be more realistic, especially the analysis of the loosening process of the slot wedge fixed by the spacer is not perfect, so it cannot be accurately and completely monitored. Loose wedges in the stator insulation structure

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