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Ultrasonic receiving array orientation method for transformer partial discharge positioning

A partial discharge and receiving array technology, which is applied in the field of orientation of ultrasonic receiving arrays, and can solve the problems of insufficient directional effect of broadband ultrasonic signals.

Inactive Publication Date: 2014-08-20
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the equivalent covariance matrix obtained by the virtual array expansion is only processed by the narrowband spatial spectrum estimation algorithm, and the directional effect of the broadband ultrasonic signal radiated by partial discharge is still insufficient.

Method used

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  • Ultrasonic receiving array orientation method for transformer partial discharge positioning
  • Ultrasonic receiving array orientation method for transformer partial discharge positioning
  • Ultrasonic receiving array orientation method for transformer partial discharge positioning

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] The present invention is used for the orientation method of the ultrasonic receiving array used for the localization of transformer partial discharge, the method is aimed at the ultrasonic array used for orientation of incoming wave direction of partial discharge in transformer, and the array is L-shaped or cross-shaped along the edge or center of the planar array array line layout, see figure 1 .

[0045] (1) Select the focusing matrix to realize the focusing of the broadband signal

[0046] The key to broadband signal aggregation is to construct a focusing matrix. In this paper, the relationship between noise-free data at non-overlapping frequency points in the frequency band is used to select the focusing matrix, and the signal space at each frequency point is focused to the reference frequency point.

[0047] First, the r...

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Abstract

The invention discloses an ultrasonic receiving array orientation method for transformer partial discharge positioning. According to the method, an ultrasonic receiving array which is arranged along the array edge or the center line of a planar array and is in an L shape or in a cross shape is used. The method comprises the steps that broadband focusing and array expansion are combined, focusing operation is conducted on an ultrasonic array receiving signal of a broadband first, a broadband ultrasonic signal generated through partial discharge is segmented according to time, a focusing matrix is calculated through noiseless data, and the signal is focused on the same frequency band; then, virtual expansion is conducted on the array through a fourth order cumulant algorithm, and a data covariance matrix of the array after virtual expansion is replaced by an unexpanded fourth order cumulant matrix which is formed in sequence of an original array; at last, the partial discharge incoming wave direction of the array after virtual expansion is estimated through a multi-signal sorting algorithm.

Description

【Technical field】 [0001] The invention belongs to the technical field of high-voltage equipment and testing, and in particular relates to an orientation method of an ultrasonic receiving array for transformer partial discharge positioning. 【Background technique】 [0002] Power transformers are an important part of power systems. Statistics show that insulation defects are the primary cause of transformer failure, and partial discharge is an important symptom reflecting insulation deterioration. The detection of partial discharge is an important part of various tests on power transformers and other electrical equipment, and the accurate positioning of partial discharge is related to more accurately reflecting the insulation status of the equipment and formulating corresponding maintenance strategies. Great significance. [0003] Currently, established but not always successful methods for PD localization in transformers include electrical methods, ultrasonic methods, and a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 罗勇芬辛晓虎李彦明
Owner XI AN JIAOTONG UNIV
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