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Method and device for diagnosis of insulation ageing of electric machine based on small wave conversion

A wavelet transform and insulation aging technology, which is used in the testing of motor generators and the analysis of solids using sonic/ultrasonic/infrasonic waves. The effect of avoiding electromagnetic interference and easy operation

Inactive Publication Date: 2003-03-12
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] Each test item in the electrical test method can only examine a certain performance of the main insulation, so it is often necessary to go through several tests to determine the aging state of the insulation, and some test equipment is more complicated and cumbersome, and the field test is not good. convenient
Due to the large electromagnetic interference on site, the electrical experiment results are easily affected by electromagnetic interference

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  • Method and device for diagnosis of insulation ageing of electric machine based on small wave conversion
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  • Method and device for diagnosis of insulation ageing of electric machine based on small wave conversion

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Embodiment Construction

[0023] The structure and data processing of the detection method and device of the present invention will be further described in detail below in conjunction with the drawings and the technical solution of the inventor according to the present invention.

[0024] The acoustic detection method for detecting the aging state of the main insulation of a large generator of the present invention includes the following steps: the impact source generates an impact force to strike the main insulation surface of the stator bar of the large generator; an acoustic sensor is used to receive the impact of the main insulation on the impact force Radiate the sound wave; sample the generated sound wave; hold the collected signal, and then process and display it after digitization; because the obtained sound signal is difficult to identify, use wavelet analysis technology to process the sound signal to obtain wavelet Transform the modulus maximum value below the scale and compare it with the set th...

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Abstract

A method based on wavelet transform for diagnosing the age state of electric machine's insulation includes beating the main insulating surface of stator bar of large electric generator, receiving the radiated sound wave by sound sensor, wavelet transforming to find out the modular maximum, and determining its age state. Its apparatus is composed of impact source, signal detector, sound sensor, data processing and display unit and software.

Description

1. Technical field: [0001] The invention belongs to the technical field of motors, and relates to the non-destructive detection of the aging state of the main insulation of a large generator, and in particular to a method and device for diagnosing the aging of the motor insulation based on wavelet transform. 2. Background technology: [0002] During the operation of large generators, the stator winding insulation is gradually aging due to the combined action of electrical, thermal, mechanical stress and various environmental factors. The aging of the insulation not only reduces the mechanical strength and electrical strength of the motor, but even causes the generator to malfunction. Therefore, accurate diagnosis of the insulation aging state is of great significance for improving the operating reliability of the generator and predicting the remaining life of the main insulation of the generator. [0003] The electrical test of the insulation structure is a traditional method for...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01R31/34
Inventor 谢恒堃马小芹项添春
Owner XI AN JIAOTONG UNIV
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