Adaptive partial discharge ultrasonic monitoring method based on any array

A partial discharge and ultrasonic monitoring technology, applied in the monitoring field, can solve the problems of poor flexibility and poor anti-interference performance, and achieve the effect of good output signal-to-noise ratio and resolution, high resolution, and guaranteed monitoring performance.

Active Publication Date: 2016-02-17
湖南湘能讯杰科技发展有限公司
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Problems solved by technology

The above method is only suitable for several specific formations, with poor flexibility and poor anti-interference performance

Method used

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  • Adaptive partial discharge ultrasonic monitoring method based on any array
  • Adaptive partial discharge ultrasonic monitoring method based on any array
  • Adaptive partial discharge ultrasonic monitoring method based on any array

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0039] The essence of the invention is to model the sensor array in any formation and introduce adaptive beamforming technology, thereby improving the application range and anti-jamming performance of the method. Described method comprises the steps:

[0040] 1) corresponding figure 1 In 101, an array containing N ultrasonic sensor array elements is used to receive signals;

[0041] 2) corresponding figure 1 In 102, the time-domain signals of N array elements and L snapshots are accumulated;

[0042] 3) corresponding figure 1 In 103, fast Fourier transform is performed on L time-domain snapshot signals of N array elements to obtain an N*L frequency-domain data matrix X;

[0043] 4) corresponding figure 1 In 104, the array covariance matrix R is estimated using the Fourier transformed snapshot data

[0044] (1)

[0045] In the formu...

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Abstract

The invention discloses an adaptive partial discharge ultrasonic monitoring method based on any array, comprising steps of utilizing a sensor array of any array to receive spatial signals, processing the received spatial signals to obtain characteristic value decomposition matrix of an array covariance matrix, performing modeling on each scanning point in the space to obtain an expected guidance vector of any array, looking for the optimal guidance vector according to the obtained expected guidance vector and the characteristic decomposition matrix, wherein the optimal guidance vector is obtained from the expected guidance vector through the principle formed by the adaptive wave beams, forming an optimal weight vector according to the optimal guidance vector and obtaining the evaluation result of the sound source position according to the optimal weight vector. The invention can maximally inhibit the noise and interference, can reduce the output sidelobe of the processor, and can guarantee the output signal to noise ratio, has higher resolution, guarantees the monitoring performance under the interference condition, has the wide application range and strong interference resistance.

Description

Technical field: [0001] The invention relates to a method for transformer partial discharge monitoring, in particular to an arbitrary array-based self-adaptive partial discharge ultrasonic monitoring method, which belongs to the technical field of monitoring. Background technique: [0002] Power transformers are an important part of power systems. Partial discharge is an important symptom reflecting the degradation of transformer insulation performance. Partial discharge will produce electromagnetic waves, sound, light, heat and other physical and chemical phenomena. According to the analysis and processing of these quantities, the position of the partial discharge source can be obtained. The monitoring methods thus formed mainly include pulse current method, gas chromatography and ultrasonic method. , UHF method and photometry method. Among them, the ultrasonic method using sensor array has been widely used because of its advantages of avoiding the influence of electromag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1209
Inventor 郭志远徐英涛蔡红孙红梅徐志强孙万里孙雪磊王治超汪波刘栋刘咏梅
Owner 湖南湘能讯杰科技发展有限公司
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