Space charge measuring signal attenuation and dispersion factor compensation method

A technology for measuring signals and space charges, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., to achieve the effect of eliminating attenuation and dispersion process, high resolution and measurement accuracy, and eliminating influence

Inactive Publication Date: 2015-06-10
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a compensation method for acoustic wave signal attenuation and dispersion when measuring space charge in a large-sized sample based on the pulse electroacoustic method

Method used

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  • Space charge measuring signal attenuation and dispersion factor compensation method
  • Space charge measuring signal attenuation and dispersion factor compensation method
  • Space charge measuring signal attenuation and dispersion factor compensation method

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Embodiment Construction

[0019] figure 1 is the schematic diagram of space charge signal before phase inversion;

[0020] figure 2 is the schematic diagram of space charge signal after phase inversion;

[0021] image 3 It is a large-scale sample space charge measurement signal attenuation and dispersion factor compensation flow chart, including the following steps:

[0022] Step 301: Apply a low-voltage DC voltage to obtain a space charge measurement signal

[0023] Step 302: select the signal peaks at the inner and outer electrodes respectively as reference signals, and perform fast Fourier transform on them to obtain V(ω, a) and V(ω, b);

[0024] Step 303: Calculate and obtain the attenuation coefficient α(ω) and the dispersion coefficient β(ω);

[0025] Step 304: Obtain the system transfer function as G(ω);

[0026] Step 305: Perform fast Fourier transform on the restored and geometrically compensated measurement signal to obtain V s (ω,r);

[0027] Step 306: Perform attenuation and dispe...

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Abstract

The invention discloses a space charge measuring signal attenuation and dispersion factor compensation method which includes the steps: applying direct-current low voltage to two ends of a large-sized test sample and acquiring acoustic signal attenuation coefficient and dispersion coefficient; respectively selecting signal peaks v (t, a) and v (t, b) of a high-voltage electrode and a ground electrode and performing Fourier transformation to obtain frequency domain signals V (omega, a) and V (omega, b); calculating the attenuation coefficient alpha (omega) and the dispersion coefficient beta (omega); acquiring a system transfer function G (omega, r); performing fast Fourier transformation for measuring signals after recovery and geometric factor compensation to obtain frequency domain pulse electro-acoustic method space charge measuring signals Vs (omega, r); setting signals Vs (omega, r)*G (omega, r) after attenuation and dispersion compensation, and performing Fourier inverse transformation for the signals to obtain time domain signals. The method is applicable to the processing course of the pulse electro-acoustic method space charge measuring signals of the large-sized test sample, and the influence of attenuation and dispersion in the acoustic signal propagation process caused by viscoelasticity of insulating materials can be eliminated, so that high resolution and precision measuring signals are acquired.

Description

technical field [0001] The invention relates to a compensation method for space charge measurement signal attenuation and dispersion factor, in particular to a method for compensating acoustic wave signal attenuation and dispersion when measuring space charge of a large-scale sample based on a pulse electroacoustic method (PEA). Background technique [0002] The measurement of space charge by pulse electroacoustic method is a measurement technology widely used at present. This method shows satisfactory sensitivity and spatial resolution in the measurement of space charge of thin samples. And the application of it to the space charge measurement of thick flat samples (such as more than 2mm) and full-size cable samples and other large-scale samples has also attracted increasing attention. However, due to the viscoelasticity of the insulating material, the propagation of the acoustic wave in the measured insulating medium has experienced attenuation and dispersion processes, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/24
Inventor 傅明利侯帅张凯钟力生田野卓然
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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