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A method for judging the aging status of xlpe cable insulation

A technology of cable insulation and judgment method, which is applied in the direction of testing dielectric strength, etc., and can solve the problems of not evaluating cable insulation aging, cable aging state error, etc.

Active Publication Date: 2017-08-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no standard method for evaluating cable insulation aging. In China, one index is often used to determine the aging state of cables, but there are large errors in judging the aging state of cables by a single index; foreign countries often use multiple methods to evaluate the aging state of cables.

Method used

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  • A method for judging the aging status of xlpe cable insulation
  • A method for judging the aging status of xlpe cable insulation
  • A method for judging the aging status of xlpe cable insulation

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Embodiment

[0069] Such as figure 1 As shown, this embodiment discloses a method for judging the aging condition of XLPE cable insulation, and the steps are as follows:

[0070] S1. Obtain a first cable sample, a second cable sample, and a third cable sample from the tested XLPE cable, and preprocess the first cable sample, the second cable sample and the third cable sample respectively.

[0071] In this embodiment, the pretreatment process of the first cable sample and the second cable sample is as follows: first, a wrench-like stripper is used to spirally rotate along the cable axis to uniformly remove the semiconductor shielding layer, and use absolute ethanol to treat the cable surface Perform cleaning to reduce the test error caused by surface leakage current. Then put the cable in an environment of 25~35℃ for one day for natural and sufficient drying without mechanical, thermal and electrical effects; the pretreatment process of the third cable sample is: first cut the cable from the t...

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Abstract

The invention discloses a method for judging the aging status of XLPE cable insulation. In the judging method, firstly, the partial discharge of a first cable sample is used to judge whether there is aging. In order to obtain the aging factor, calculate the activation energy of cross-linked polyethylene for the third cable sample, and then use the aging factor and the activation energy of cross-linked polyethylene as a common criterion to obtain whether the cable to be tested is in an aging state, and whether the aging The severity of the state. The present invention adopts the isothermal relaxation current method and the activation energy method to comprehensively judge the aging status of cable insulation, overcomes the defect of large judgment errors in judging the aging status of XLPE insulated cables by a single index, and provides a comprehensive electrical quantity (aging factor) and non-electrical quantity (activation energy) to evaluate the aging condition of XLPE cable insulation more accurately, and the judgment method is simpler.

Description

Technical field [0001] The invention relates to a method for determining the aging state of cable insulation, in particular to a method for determining the aging state of XLPE cable insulation. Background technique [0002] Cross-linked polyethylene (XLPE) is widely used in power cable insulation because of its high-quality electrical and mechanical properties. The use of XLPE cables in my country began in the 1980s. At present, many domestic cables have been running for nearly 30 years of design life and are facing the problem of replacement. XLPE cable lines generally have insulation after a long period of operation, except for damage caused by force. The cause of damage is often the breakdown caused by the aging of the insulation. The aging of the cable insulation is the main cause of the cable line fault. Therefore, understanding the aging state of the cable is of great significance to the normal operation of the entire power system. [0003] Insulation aging is an irreversible...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 刘刚金尚儿
Owner SOUTH CHINA UNIV OF TECH
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