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A method and device for local weak physical damage location of cables

A damage location and cable technology, applied in the direction of material impedance, etc., can solve the problems of low location accuracy and low spatial resolution.

Inactive Publication Date: 2021-04-13
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the spatial resolution of this scheme is low, especially when the local damage is located at the beginning and end of the cable, the localization accuracy is low

Method used

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  • A method and device for local weak physical damage location of cables
  • A method and device for local weak physical damage location of cables
  • A method and device for local weak physical damage location of cables

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Embodiment Construction

[0031] In the following, the present invention will be further described in detail in conjunction with the accompanying drawings and embodiments, so as to make the purpose, technical solutions and advantages of the present invention more clear. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] figure 1 A schematic diagram showing the application principle of the method for locating local weak physical damage to cables according to an exemplary embodiment of the present invention. The method of this embodiment mainly includes the following steps:

[0033] Step 101: Process the terminal joint of the cable under test through the SMA (Sub-Miniature-A, ultra-small A type) connector, so that the wire core and the copper shielding layer form a loop

[0034] Specifically, the core of the cable under test is welded to the core of the SMA connector through the SMA connector,...

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Abstract

The invention discloses a method and device for locating local weak physical damage of cables, which can improve the influence effect of physical defects on distribution parameters, has higher spatial resolution, can better reflect weak physical damage of cables, and locates The accuracy is high, and the misjudgment points are greatly reduced or even have no misjudgment points. The method includes: processing the terminal joint of the tested cable through an SMA connector; setting the frequency sweep signal bandwidth according to the length of the tested cable to obtain the S parameter and input impedance spectrum of the tested cable; calculating the transmission coefficient of the tested cable according to the input impedance spectrum; Construct the improved transfer function according to the S parameter and the cable transmission coefficient, and obtain the corresponding improved transfer function spectrum; the integral transformation of the improved transfer function spectrum will change the abscissa of the improved transfer function spectrum from the frequency domain to the space domain; Calculate the change rate, and determine the specific location of the damage according to the distortion peak value on the cable local weak defect location curve.

Description

technical field [0001] The invention relates to the technical field of cable local weak physical damage location, in particular to a method and device for cable local weak physical damage location. Background technique [0002] As the use of cables in various electrical systems increases year by year and occupies an important position, the annual losses caused by direct or indirect accidents of cables are as high as hundreds of billions. The running state of the cable is closely related to the stable operation of the power system. [0003] In actual operation, cables often have different damages such as aging and wear due to mechanical, high temperature, humidity and other reasons, which lead to various weak physical damages. Once these weak (for example, less than 0.1 meters in length) damages deteriorate, they will affect the normal operation of the power system. cause serious impact. Therefore, it is of great significance to discover the local weak physical damage of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/02
CPCG01N27/02
Inventor 张安安高春林李茜林钰曾蕊张珂嘉葛茗瑞左芸裴陈位发李中云张阳
Owner SOUTHWEST PETROLEUM UNIV
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