XLPE cable insulation aging state determining method

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

Active Publication Date: 2015-07-01
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
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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...

Method used

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  • XLPE cable insulation aging state determining method
  • XLPE cable insulation aging state determining method
  • XLPE cable insulation aging state determining method

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Embodiment

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

[0070] S1. Obtain a first cable sample, a second cable sample, and a third cable sample from the XLPE cable to be tested, and perform pretreatment on 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-shaped stripper is used to spirally rotate and pull along the cable axis, and the semiconductor shielding layer is evenly cut off, and the cable surface is treated with absolute ethanol. Cleaning is performed to reduce test errors caused by surface leakage currents. Then put the cable in an environment of 25-35°C for one day to dry it naturally, without being affected by machinery, heat and electricity; the pretreatment process of the third cable s...

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Abstract

The invention discloses an XLPE cable insulation aging state determining method. The method includes firstly, determining whether aging exists or not by means of the partial discharging amount of a first cable sample, if not, calculating the isothermal relaxation current according to a second cable sample, acquiring aging factors, calculating the activation energy of XLPE according to a third cable sample, adopting the aging factors and the activation energy of XLPE as common criterion, and acquiring whether aging of the cable to be tested exists or not and the severity of the aging state. The cable insulation aging state can be determined by the isothermal relaxation current method and the activation energy method comprehensively, the defect that large determination errors are produced since the XLPE insulation cable aging state is determined by one single indicator is overcome, the more accurate estimation of the XLPE cable insulation aging state is provided by combining the electric quantity (aging factors) and non electric quantity (activation energy), and the method is simpler.

Description

technical field [0001] The invention relates to a method for judging the aging state of cable insulation, in particular to a method for judging the aging state of XLPE cable insulation. Background technique [0002] Cross-linked polyethylene (XLPE) is commonly used for power cable insulation due to its excellent electrical and mechanical properties. The use of XLPE cables in my country began in the 1980s. At present, many domestic cables have a design life of nearly 30 years and are facing the problem of replacement. XLPE cable lines are damaged by external forces and cause failures. Generally, insulation will appear after a long period of operation. The cause of damage and failure is often the breakdown caused by insulation aging. Cable insulation aging is the main cause of cable line failure. Therefore, understanding the aging state of cables is of great significance to the normal operation of the entire power system. [0003] Insulation aging is an irreversible change in ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 刘刚金尚儿
Owner SOUTH CHINA UNIV OF TECH
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