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
CN108508337AActive Publication Date: 2018-09-07SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANGHAI MUNICIPAL ELECTRIC POWER CO
Publication Date
2018-09-07

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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.
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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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