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Stray current measuring method based on fast Fourier transform

A Fourier transform and stray current technology, applied in the direction of using digital measurement technology for measurement, etc., can solve the reason of stray current generation, cathodic protection affects scientific evaluation, and can not know the frequency spectrum of stray current stray current Polarization direction and other issues to achieve the effect of preventing lightning strike and instantaneous current breakdown damage, controlling stray current, and high measurement accuracy

Inactive Publication Date: 2017-03-22
成都天誉立信科技有限公司
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Problems solved by technology

This method has the disadvantages of not being able to know the frequency spectrum of the stray current (that is, the frequency range and the amplitude of each frequency point), the polarization direction of the stray current, etc., so that it is impossible to make a contribution to the cause of the stray current and its impact on cathodic protection. more scientific evaluation

Method used

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  • Stray current measuring method based on fast Fourier transform
  • Stray current measuring method based on fast Fourier transform

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Embodiment

[0038] A stray current measurement method based on fast Fourier transform, such as figure 1 shown, including the following steps:

[0039] S1: Collect stray electrical signals from buried steel pipelines;

[0040] S2: Perform signal conditioning on the collected stray electrical signals to obtain continuous time-domain analog signals;

[0041] S3: Using a high-precision analog-to-digital conversion chip to sample the continuous time-domain analog signal at a fixed sampling frequency f0, and perform analog-to-digital conversion to obtain a discrete time-domain digital signal;

[0042] S4: Perform Fourier transform on N discrete time-domain digital signals with period T to obtain frequency-domain signals from 0 Hz to 508 Hz;

[0043] S5: Analyze the frequency spectrum characteristics of the stray current according to the obtained frequency domain signal, and obtain the frequency and magnitude of the stray current.

[0044] The present invention uses a fixed sampling frequency...

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Abstract

The invention discloses a stray current measuring method based on fast Fourier transform. The stray current measuring method based on fast Fourier transform includes the following steps: acquiring stray electric signals of a buried steel pipeline; performing signal conditioning on the acquired stray electric signals, and obtaining continuous time domain analog signals; utilizing a high accuracy analog-to-digital conversion chip to sample the continuous time domain analog signals in a fixed sampling frequency f0, and performing analog-to-digital conversion to obtain discrete time domain data signals; and using a cycle T to perform Fourier transform on the N discrete time domain data signals to obtain frequency domain signals of 0Hz-508Hz. The stray current measuring system based on fast Fourier transform includes a detection circuit, a signal conditioning circuit, a sampling and analog-to-digital conversion module and a signal processing chip. The stray current measuring method and system based on fast Fourier transform can obtain the source and the magnitude of the stray current born by the test point according to the analysis result, can make an accurate determination about protection of the pipeline, and have the advantages of high interference immunity and high accuracy.

Description

technical field [0001] The invention relates to the field of stray current measurement of buried steel pipelines, in particular to a method and system for measuring stray current based on fast Fourier transform. Background technique [0002] Stray current is a kind of current flowing outside the specified circuit, which often produces a large current. Stray current has the characteristics of multiple sources, and can be roughly divided into AC stray current, DC stray current, ground (natural ) Three types of stray current. In particular, DC stray currents will cause severe fluctuations in the cathodic protection potential of buried pipelines, which will greatly damage the pipelines. [0003] Different types of stray currents have different spectral characteristics: [0004] The AC stray current mainly comes from the transmission, induction and ground feeding of industrial power. The polarization direction and the complexity of the spatial distribution of industrial stray ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
Inventor 王光春高鹏程
Owner 成都天誉立信科技有限公司
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