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Dielectric analysis method for evaluating insulation aging state of XLPE cable

A technology for cable insulation and aging state, which is applied in the direction of testing dielectric strength, dielectric performance measurement, and resistance/reactance/impedance measurement. Achieve the effect of clear aging status indication

Active Publication Date: 2018-09-07
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the dielectric loss of XLPE is often used to reflect the aging degree of the cable. However, the change law of the dielectric loss spectrum is not clear enough, which brings certain difficulties to the evaluation of the aging state.

Method used

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  • Dielectric analysis method for evaluating insulation aging state of XLPE cable
  • Dielectric analysis method for evaluating insulation aging state of XLPE cable
  • Dielectric analysis method for evaluating insulation aging state of XLPE cable

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Embodiment Construction

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below, obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0021] The principle of the invention is to characterize the aging state of the cable insulation after the complex dielectric constant of the cable insulation is tested at a certain temperature, and the real part of the dielectric constant is mathematically changed.

[0022] The specific implementation steps of the embodiments of the present invention are as follows:

[0023] 1) The target samples in this example are taken from 110kV unserviced XLPE cable insulation. After slicing, they are subjected to accelerated th...

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Abstract

The invention relates to a dielectric analysis method for evaluating insulation aging state of XLPE cables, which comprises the following steps of: step 1, measuring the frequency spectrum of the complex dielectric constant of XLPE cable insulation at a set temperature, and obtaining the change curve of a dielectric constant real part epsilon' and a dielectric constant imaginary part epsilon' following frequency; step 2, performing mathematical change on the dielectric constant real part epsilon' to obtain the change curve of mathematical formula with a dielectric constant real part epsilon' following the frequency; step 3, analyzing the insulation aging state of XLPE cable according to the change curve of step 2. Compared with the prior art, the dielectric analysis method for evaluating insulation aging state of XLPE cables has the advantages that the method is simple and feasible, and has certain engineering application prospect.

Description

technical field [0001] The invention relates to the field of insulation detection of power equipment, in particular to a dielectric analysis method for evaluating the aging state of XLPE cable insulation. Background technique [0002] Cables are the foundation of urban power grids, and the performance and anti-deterioration capabilities of cable insulation directly determine the safe and stable operation of power systems. With the rapid development of my country's power system, UHV AC and DC transmission systems are widely used in long-distance, large-capacity power transmission. All of these put forward higher requirements for the performance, stability and condition evaluation of the cables used in them. [0003] Generally, the aging state of XLPE can be characterized by macroscopic properties and structures, such as elongation at break, tensile strength, carbonyl index, melting temperature, degree of crosslinking, crystallinity, etc. These methods can effectively charac...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R27/26
CPCG01R27/2617G01R31/1272
Inventor 周利军蒋晓娟张屹陈立荣王承陆俊侯东雨杨舒婷周宏徐伟何磊朱宇明陆青汤敏吉沈斌
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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