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

Abstract

A method for detecting loose vibration of stator slot wedges of large generators, comprising the following steps: a. using a controllable vibrator to generate an exciting force to tap the measured slot wedges to cause the measured slot wedges to vibrate; b. using acoustic sensors, The displacement sensor converts the sound waves radiated by the vibration of the measured slot wedge and the displacement of the vibration into sound wave electrical signals and displacement electrical signals; c. Digitize the measured sound wave electrical signals and displacement electrical signals; d. The data processing module according to the measured slot The wedge type is fixed, the characteristic quantities of the acoustic wave signal and the displacement signal are extracted, and compared with a predetermined threshold value, the state of the measured slot wedge is obtained. The method is applicable to different slot wedge fixing structures, and can quickly and accurately detect the looseness of slot wedges of large generators. Vibration is controlled by software, and the vibration waveform of each slot wedge can be set. It can quickly detect the state of the tested slot wedge in real time and import and analyze historical data. The system has a high degree of automation. The interface is friendly, easy to operate, and the system is highly portable.

Description

technical field [0001] The invention belongs to the field of insulation fault diagnosis of large motors, in particular 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 electric power industry, generators tend to be large-capacity and high-voltage. Large-scale generators are an important part of the power system. Once such large-scale equipment fails, not only the crisis of the generator itself, but also the sudden Sexuality will cause a blackout of the entire power system and cause huge economic losses. Therefore, it is very important to ensure the safe and stable operation of all links of large generators. During the long-term operation of the stator bar of a large generator, due to the action of the current of the stator bar and the transverse magnetic field in the slot, the bar at the slot generates radial electromagnetic force. The end of the stator windi...

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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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