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Distribution cable defect positioning algorithm adopting windowing Fourier transform

A technology of windowing Fourier transform and power distribution cables, which is applied in the direction of fault location and fault detection according to conductor type, etc., can solve the problems of defect identification sensitivity and spectrum analysis accuracy decline, and achieve suppression of spectrum leakage and fence effect, suppression of Fence effect, effect of improving accuracy

Pending Publication Date: 2021-11-26
SICHUAN UNIV
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Problems solved by technology

[0006] The present invention overcomes the deficiencies in the prior art and provides a distribution cable defect location algorithm using windowed Fourier transform, one of the purposes of which is to use the cable head end input impedance spectrum to realize local The positioning of defects and intermediate joints, through simulation and experimental verification, shows that the proposed method can locate the defects of the cable body and the effectiveness of intermediate joints with high sensitivity and high precision. Another purpose is to solve the problem caused by data truncation in the spectrum analysis of DFT In order to solve the problem of decreased accuracy of spectrum analysis, a method to suppress spectrum leakage and fence effect and improve defect identification sensitivity is proposed

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  • Distribution cable defect positioning algorithm adopting windowing Fourier transform
  • Distribution cable defect positioning algorithm adopting windowing Fourier transform
  • Distribution cable defect positioning algorithm adopting windowing Fourier transform

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Embodiment Construction

[0033] The technical solutions of the present invention will be further described below through specific examples.

[0034] 1.1 Cable transmission characteristics and input impedance spectrum

[0035] The transmission characteristics of signals (or energy) in cables can be described according to the transmission line theory. Under high-frequency conditions, as the frequency increases, the radiation loss, conductor loss, and dielectric loss of circuit components increase, and the parameters in the circuit components also change accordingly. At this time, the circuit cannot be considered as a lumped parameter circuit. When the cable length is much longer than the signal wavelength, the cable can be equivalent to a distributed parameter circuit. The transmission characteristics of the line are mainly related to the electrical performance of the cable itself, which is characterized by the input impedance and reflection coefficient in the cable line. The equivalent model of cable ...

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Abstract

The invention provides a distribution cable defect positioning algorithm adopting windowing Fourier transform. The distribution cable defect positioning algorithm comprises the following steps: step 1, testing cable data; and step 2, positioning a local defect / intermediate joint of the cable by inputting an impedance spectrum at the head end of the cable. The distribution cable defect positioning algorithm has the beneficial effects that windowing Fourier transform is applied, the performance of different window functions is analyzed and compared, and the optimal window function is selected to improve the recognition sensitivity and positioning precision of the cable local defect / intermediate joint.

Description

technical field [0001] The invention relates to the field of locating local defects / intermediate joint defects of distribution cables, and more specifically relates to a distribution cable defect location algorithm using windowed Fourier transform. Background technique [0002] In order to ensure the safe operation of distribution cables and improve the reliability of power supply of distribution cables, it is necessary to conduct regular inspections on distribution cables, and formulate corresponding on-site treatment plans for them according to the insulation status of the tested cables. For the diagnosis of the severity of cable moisture, the commonly used test and diagnosis methods are: insulation resistance test method and dielectric loss factor test method. Although the above three methods can diagnose local moisture defects of cables, these three methods belong to the overall insulation evaluation method, which can only diagnose the overall insulation performance of c...

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 周凯孟鹏飞王昱皓梁钟颖龚薇李原朱光亚
Owner SICHUAN UNIV
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