Ultrasonic positioning method for partial discharge fault point of traction transformer

A traction transformer and partial discharge technology, applied in positioning, instrumentation, testing dielectric strength, etc., can solve the problem of large partial discharge positioning error, complex structure of traction transformer, and difficulty in distinguishing ultrasonic signal propagation paths as direct paths or indirect paths, etc. problem, to achieve the effect of improving the accuracy of discharge positioning

Active Publication Date: 2020-06-19
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0003] Due to the complex structure of the traction transformer, it is difficult for conventional methods to distinguish the propagation path of the ultrasonic signal as a direct path or an indirect path
The current partial discharge ultrasonic positioning method often ignores the influence of the transformer structure on the propagation path, and simplifies the ultrasonic propagation path to a straight line to the ultrasonic sensor, resulting in a large partial discharge positioning error

Method used

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  • Ultrasonic positioning method for partial discharge fault point of traction transformer
  • Ultrasonic positioning method for partial discharge fault point of traction transformer
  • Ultrasonic positioning method for partial discharge fault point of traction transformer

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Embodiment Construction

[0033] The implementation process of the present invention will be further described in detail below in conjunction with the accompanying drawings and cases.

[0034] The first step is to obtain the ultrasonic signal and denoise:

[0035] Obtain the ultrasonic signal s received by the four ultrasonic sensors i , wherein i=1,2,3,4 is the serial number of the ultrasonic sensor; s 1 is the ultrasonic signal received by the first ultrasonic sensor, s 2 is the ultrasonic signal received by the second ultrasonic sensor, s 3 is the ultrasonic signal received by the third ultrasonic sensor, s 4 Be the ultrasonic signal that the 4th ultrasonic sensor receives;

[0036] The coordinates of the first ultrasonic sensor are (x 1 ,y 1 ,z 1 ), the coordinates of the second ultrasonic sensor are (x 2 ,y 2 ,z 2 ), the coordinates of the third ultrasonic sensor are (x 3 ,y 3 ,z 3 ), the coordinates of the fourth ultrasonic sensor are (x 4 ,y 4 ,z 4 ), the coordinates of the parti...

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Abstract

The invention discloses an ultrasonic positioning method for a partial discharge fault point of a traction transformer. Ultrasonic signals are obtained and denoised through four ultrasonic sensors arranged on the surface of a transformer; the collected ultrasonic waveform is analyzed to obtain waveform characteristic parameters, wherein the waveform characteristic parameters comprise a peak-rise time ratio, kurtosis, peak frequency and a frequency spectrum centroid; a path judgment coefficient of the ultrasonic signal is obtained, wherein the judgment coefficient can identify a propagation path of the ultrasonic signal; and finally, a time difference equation is established and calculated to obtain a local discharge source coordinate. The method effectively improves the partial discharge positioning precision and positioning efficiency of the transformer.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of traction power supply equipment, and in particular relates to an ultrasonic positioning method for a partial discharge fault point of a traction transformer. Background technique [0002] The traction transformer is a crucial equipment in the traction power supply system, and its safe operation is of great significance. A large number of data show that the main cause of traction transformer failure is the deterioration of its insulation performance. Partial discharge is the main cause and one of the main symptoms of transformer insulation degradation, and its on-line detection and precise location are of great significance. Ultrasonic signals will be generated when the transformer is partially discharged, so the partial discharge of the transformer can be detected and located by detecting the ultrasonic signal. [0003] Due to the complex structure of the traction transformer, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01S5/22
CPCG01R31/1209G01S5/22
Inventor 蔡君懿周利军黎枝鑫
Owner SOUTHWEST JIAOTONG UNIV
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