Method for evaluating aging degree of crosslinked polyethylene cable based on nuclear magnetic resonance

A cross-linked polyethylene, nuclear magnetic resonance technology, applied in the direction of analysis by nuclear magnetic resonance, can solve the problems of aging factors, aging, differences and other problems that cannot be fully considered

Active Publication Date: 2013-03-27
STATE GRID EAST INNER MONGOLIA ELECTRIC POWER CO LTD MAINTENANCE BRANCH +1
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  • Abstract
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Problems solved by technology

The DSC method cannot theoretically establish the relationship between the information provided by the method and the functional failure of the material
Especially due to the complexity of XLPE cable laying and operating environment, it will be affected by factors such as electricity, heat, chemistry and water in actual operat...

Method used

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  • Method for evaluating aging degree of crosslinked polyethylene cable based on nuclear magnetic resonance
  • Method for evaluating aging degree of crosslinked polyethylene cable based on nuclear magnetic resonance
  • Method for evaluating aging degree of crosslinked polyethylene cable based on nuclear magnetic resonance

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Embodiment Construction

[0029] The method of the present invention refers to the following steps.

[0030] 1) Using nuclear magnetic resonance to obtain the molecular structure of normal XLPE cables

[0031] Take the insulating layer material (cross-linked polyethylene) of the normal (new factory) cable sample, sample along the axial direction of the insulating layer, cut into particles of uniform size, and weigh 1.2g as a normal sample.

[0032] The normal sample is analyzed by nuclear magnetic resonance analyzer. The parameters of nuclear magnetic resonance analyzer are set as follows: the center frequency (SF1) is 22MHz, the offset frequency (O1) is 584.347825 KHz, the pulse sequence repetition time (TR) is 2000us, and the number of repeated sampling (NS) is 16, attached figure 2 is the NMR inversion spectrum of the sample obtained under this parameter setting.

[0033] Obtain the peak area SP of normal XLPE cables by NMR analysis 0 and the longitudinal relaxation time RTL 0 , the peak area S...

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Abstract

The invention relates to a method for evaluating aging degree of a crosslinked polyethylene cable based on nuclear magnetic resonance. The method comprises the following steps of: testing and comparing a molecular structure of the crosslinked polyethylene cable under different aging degrees through a nuclear magnetic resonance analyzer, and obtaining a proportional relation among the crosslinked polyethylene aging degrees, the temperature and the time, thus obtaining an aging state and residual service life of the crosslinked polyethylene cable to be evaluated according to the proportional relation. According to the method, the aging performance of an insulating material is detected from a micro perspective.

Description

technical field [0001] The invention relates to a method for evaluating the aging degree of cross-linked polyethylene cables based on the principle of nuclear magnetic resonance, in particular to the relationship between the microscopic properties of cross-linked polyethylene cables and their aging degrees. Background technique [0002] Cross-linked polyethylene (XLPE) cables are very important equipment in power transmission and transformation. They have a bottleneck effect on the safe and stable transmission of power loads. The design life of XLPE cables is about 30 years. Some domestic power companies invested in them early The cables used are close to the service life. Due to irregular construction, weather and man-made reasons, the cable operating environment has deteriorated, such as cable accumulation, water accumulation, mud, garbage filling, etc. Studies have shown that changes in the operating environment in the cable tunnel will cause the temperature of the cable ...

Claims

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Application Information

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IPC IPC(8): G01N24/08
Inventor 杨帆高兵钟杰郭杏叶冉为
Owner STATE GRID EAST INNER MONGOLIA ELECTRIC POWER CO LTD MAINTENANCE BRANCH
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