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A non-destructive evaluation method for high-frequency electrical parameters of transmission cables and accessories

A technology for electrical parameter and non-destructive evaluation, which is applied in electrical digital data processing, electrical measurement, electrical variable measurement, etc. It can solve the problem of low accuracy and achieve the effect of improving positioning accuracy and improving defects

Active Publication Date: 2019-10-25
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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Problems solved by technology

[0005] The present invention provides a non-destructive evaluation method for high-frequency electrical parameters of power transmission cables and accessories in order to overcome the defect of low precision in the non-destructive evaluation of high-frequency electrical parameters of power transmission cables and accessories in the prior art

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  • A non-destructive evaluation method for high-frequency electrical parameters of transmission cables and accessories
  • A non-destructive evaluation method for high-frequency electrical parameters of transmission cables and accessories
  • A non-destructive evaluation method for high-frequency electrical parameters of transmission cables and accessories

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[0039] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0040] In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0041] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0042] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] This embodiment provides a non-destructive evaluation method for high-frequency electrical parameters of power transmission cables and accessories, such as figure 1 As shown, the method includes a vector fitting process and a parameter identification and optimization process.

[0044] S1: Carry out vector fitting on the frequency domain model of cables and accessories, propose a Γ-type...

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Abstract

The invention discloses a non-destructive evaluation method for high-frequency electrical parameters of power transmission cables and accessories, including a vector fitting process and a parameter optimization process, specifically including the following steps: S1 performs vector fitting on the frequency domain model of the cable, and proposes a type lumped Parametric equivalent circuit model, to obtain the parameters of the circuit model to be optimized; S2 parameter optimization process, first inject the excitation pulse source at the head end of the cable to obtain the experimental measurement waveform, secondly, combine the experimental measurement waveform to simulate the circuit model parameters initially proposed in S1 The annealing algorithm is optimized to realize multi-parameter identification. The present invention adopts a series of algorithms and technologies of non-destructive pulse signal excitation, high-frequency circuit modeling and analysis, and multi-parameter identification of circuit components to realize non-destructive evaluation of high-frequency electrical parameters of transmission cables and accessories, and to accurately evaluate the time and It is of great significance to improve the positioning accuracy.

Description

technical field [0001] The invention relates to the field of non-destructive evaluation methods, in particular to a non-destructive evaluation method for high-frequency electrical parameters of power transmission cables and accessories. Background technique [0002] The propagation of the fault pulse waveform in the complex cable line and the reflection at different positions have different characteristics; when the line topology is known, when the traveling wave of the high-voltage cable propagates along the line, the wave impedance of the cable itself remains unchanged. When the traveling wave propagates to When the line joint or the connection point with other equipment, the circuit parameters change suddenly, and the wave impedance also changes accordingly. Refinement is the basis for establishing an accurate analysis model; and the establishment of accurate distribution parameters for each of the above parts needs to be determined in consideration of factors such as str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G01R31/00
CPCG01R31/00G06F30/367
Inventor 张鸣罗向源杨毅孙钦章孙廷玺郭小凯刘侃
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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