Method for reducing noise of transformer substation partial discharging pulse signals collected through pulse triggering

A partial discharge pulse and pulse triggering technology, which is applied in the direction of testing dielectric strength, can solve the problems of submerging partial discharge signals, reducing the accuracy and reliability of positioning results, and achieving the effect of improving accuracy and removing interference

Inactive Publication Date: 2014-09-03
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

[0002] The background noise in the substation will affect the extraction of the time difference of the partial discharge signal to a certain extent, and even submerge the partial discharge signal, resulting in a greatly reduced accuracy and reliability of the positioning results. Therefore, it is very important to reduce the noise of the partial discharge signal collected by the substation. meaningful

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  • Method for reducing noise of transformer substation partial discharging pulse signals collected through pulse triggering
  • Method for reducing noise of transformer substation partial discharging pulse signals collected through pulse triggering
  • Method for reducing noise of transformer substation partial discharging pulse signals collected through pulse triggering

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0031] 1. About wavelet transform

[0032] Let the signal f(t) be a square-integrable function, that is, f(t)∈L 2 (R), ψ(t) is the mother wavelet, if ψ(t) satisfies the admissibility condition

[0033] C ψ = ∫ 0 ∞ | ψ ^ ( ω ) | 2 ω dω ...

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Abstract

The invention relates to a method for reducing noise of transformer substation partial discharging pulse signals collected through pulse triggering. The method includes the following steps: (1) collecting a sample signal with partial discharging pulses, and evenly dividing the sample signal into two sections; (2) respectively carrying out wavelet transformation on the two sections of the signal, considering the section where the partial discharging pulses are located as a pulse signal section, and considering the other section as a noise window signal section; (3) carrying out wavelet transformation on the noise window signal section, and extracting maximum model values of wavelet coefficients; (4) enabling the maximum model values obtained in the step (3) to serve as threshold values to carry out noise reduction processing on the pulse signal section with a wavelet threshing value method; (5) reconstructing a partial discharging signal obtained after noise reduction according to the wavelet coefficients obtained after noise reduction and the size coefficient. Compared with the prior art, the method has the advantages that the wavelet threshold values can be dynamically extracted, the self-adaptability and the noise reduction effect of signal noise reduction can be improved, and the time difference extraction accuracy can be improved in partial discharging positioning.

Description

technical field [0001] The invention relates to a method for processing a discharge pulse signal, in particular to a method for reducing noise of a substation partial discharge pulse signal for pulse-triggered acquisition. Background technique [0002] The background noise in the substation will affect the extraction of the time difference of the partial discharge signal to a certain extent, and even submerge the partial discharge signal, resulting in a greatly reduced accuracy and reliability of the positioning results. Therefore, it is very important to reduce the noise of the partial discharge signal collected by the substation. meaningful. The noise and interference signals in the substation can be divided into white noise, continuous narrowband periodic interference and pulse interference. White noise refers to all kinds of random noise, such as noise in the acquisition system, signal transmission channel, and random noise in the field. Narrowband periodic interferenc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 胡岳江秀臣张星沈冬李爱民施会茅晓亮
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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