A Method for Detecting the Aging Degree of Cable Joints Based on Wave Impedance

A technology of cable joints and aging degree, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of troublesome on-site inspection, heavy equipment, and untargeted cable joints, and achieve the effect of preventing failures and avoiding losses

Active Publication Date: 2018-01-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the equipment required by these methods is cumbersome, and on-site detection is troublesome, and only a section of cable can be measured, and there is no specificity for cable joints.

Method used

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  • A Method for Detecting the Aging Degree of Cable Joints Based on Wave Impedance
  • A Method for Detecting the Aging Degree of Cable Joints Based on Wave Impedance
  • A Method for Detecting the Aging Degree of Cable Joints Based on Wave Impedance

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Embodiment 1

[0026] In this embodiment, in order to detect the aging degree of the cable joint, a signal generator is connected to one end of the cable to be detected, the signal generator is used to emit an incident wave, and a computer is also connected to the same end of the cable to be detected, The computer is used to collect the reflected wave reflected by the cable joint, and obtain the wave impedance of the cable joint according to the amplitude of the reflected wave, and compare the current wave impedance with the wave impedance of the newly produced cable joint to obtain the aging degree of the current cable joint .

[0027] According to the analysis of traveling wave theory, the incident traveling wave will be reflected and refracted at nodes with different wave impedances, such as figure 2 shown. In addition, due to the distance l between the signal generator access point and the cable connector 0 is shorter, so the attenuation of the signal wave and the change of the wavefo...

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Abstract

The invention discloses a method for detecting the aging degree of a cable joint based on wave impedance. The cable joint will reflect back a reflected wave, collect the reflected wave, and obtain the wave impedance of the cable joint according to the amplitude of the reflected wave; compare the current wave impedance with the wave impedance of the newly produced cable joint, and obtain the current wave impedance of the cable joint. degree of aging. The method of the invention can simply and effectively detect the running state of the cable joint, determine its aging degree, thereby judging whether it needs to be replaced, and preventing the occurrence of failure.

Description

technical field [0001] The invention relates to the field of cable joint detection research, in particular to a method for detecting the aging degree of a cable joint based on wave impedance. Background technique [0002] At present, there are relatively few methods for separately detecting the aging degree of cable joints, and most of them are to predict the remaining life of a whole section of cable body or cables including joints. At present, there are several test methods for evaluating the remaining life of cables: breakdown voltage comparison method, dielectric loss factor method, DC leakage current method, etc. However, the equipment required by these methods is cumbersome, and on-site detection is cumbersome, and only a section of cable can be measured, and the cable joint is not targeted. [0003] Therefore, it is of great significance to study a method that can test the aging degree of cable joints with simple equipment and easy operation. Contents of the invent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 刘刚柯康观
Owner SOUTH CHINA UNIV OF TECH
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