Partial discharge signal processing method considering pulse extraction and signal denoising and partial discharge positioning method for power cable

A discharge signal and processing method technology, applied in the field of partial discharge signal processing, power cable partial discharge location, partial discharge signal waveform analysis and processing, can solve the problems of poor extraction effectiveness, influence of denoising results, etc., to achieve precise positioning and extraction, The effect of local signal white noise suppression

Active Publication Date: 2019-01-15
SICHUAN UNIV
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Problems solved by technology

[0005] Aiming at the current partial pulse extraction based on "denoising first, then extracting" which is less effective and affected by denoising results, the present invention provides a partial discharge signal processing method that takes both pulse extraction and signal denoising into consideration, and can effectively extract local pulses. Pulse, even at low signal ratios, still has strong white noise suppression

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  • Partial discharge signal processing method considering pulse extraction and signal denoising and partial discharge positioning method for power cable
  • Partial discharge signal processing method considering pulse extraction and signal denoising and partial discharge positioning method for power cable
  • Partial discharge signal processing method considering pulse extraction and signal denoising and partial discharge positioning method for power cable

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Embodiment 1

[0065] The research object of this embodiment is the cold-shrinkable cable terminal with preset longitudinal knife mark defects (length 100mm, width 0.2mm, depth 1mm). The cable model is YJV22-8.7 / 15. Test the partial discharge signal under voltage, and perform pulse extraction and denoising.

[0066] The partial discharge signal processing method that takes into account both pulse extraction and signal denoising provided in this embodiment, such as figure 1 shown, including the following steps:

[0067] S1 filters the partial discharge signal to obtain the partial discharge signal sequence s(n), n=1,2,3,...,N 0 , N 0 is the length of the entire PD signal sequence.

[0068] In this embodiment, a high-frequency current sensor is firstly used to obtain the partial discharge signal on the cable, and the obtained partial discharge signal is output to the collection device through a high-pass filter. The cut-off frequency range of the high-pass filter adopted in this embodiment...

Embodiment 2

[0103] The research object of this embodiment is a 10kV XLPE cable with a length of 498m (a defect of poor lapping of the semi-conductive layer is preset at the intermediate joint 249m away from the test end). Test the partial discharge signal of the defective cable under the oscillating wave, and perform pulse extraction and denoising to realize defect location.

[0104] The partial discharge signal processing method that takes into account both pulse extraction and signal denoising provided in this embodiment, such as figure 1 shown, including the following steps:

[0105] S1 filters the partial discharge signal to obtain the partial discharge signal sequence s(n), n=1,2,3,...,N 0 , N 0 is the length of the entire PD signal sequence.

[0106] In this embodiment, firstly, under the condition of oscillatory wave (maximum voltage not exceeding 20kV, frequency 67Hz), a high-frequency current sensor is used to obtain partial discharge signals on the cable, and the obtained par...

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Abstract

The invention discloses a partial discharge signal processing method considering pulse extraction and signal denoising and a partial discharge positioning method for a power cable. The partial discharge signal processing method adopts a data processing order of ''first extraction, then denoising'', comprises the following steps of: decomposing a singular value, and comparing the optimal singular threshold with the largest singular value to realize a fast and precise positioning of a partial discharge pulse; extracting the partial discharge pulse; and denoising the extracted partial discharge pulse signal by refactoring the singular value. The partial discharge signal processing method considering pulse extraction and signal denoising and the partial discharge positioning method for the power cable can effectively suppress the white noise of the white regeneration of the partial discharge signal under lower SNR conditions based on the decomposition-reconstruction method of the singularvalue, and can suppress high-frequency interference by the denoising combining with a layer of discrete wavelet. Based on the partial discharge signal processing method described above, the partial discharge pulse is extracted, and the precise positioning of the partial discharge source (the partial discharge point) of the power cable can be realized.

Description

technical field [0001] The invention relates to the technical field of power cable partial discharge detection, and relates to a partial discharge signal waveform analysis and processing technology, in particular to a partial discharge signal processing method and a power cable partial discharge positioning method that take into account both pulse extraction and signal denoising. Background technique [0002] Partial discharge (PD) (referred to as partial discharge) is one of the manifestations of power cable insulation degradation, and it is also one of the main reasons for further deterioration of power cable insulation and insulation failure. Through the partial discharge detection and analysis of power cables, it can provide a reliable evaluation basis for power cable insulation diagnosis and monitoring. [0003] The traditional partial discharge signal processing methods mainly include two categories: 1) the feature extraction method based on the statistical spectrogram...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 周凯黄永禄谢敏赵世林李泽瑞朱光亚冉立
Owner SICHUAN UNIV
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