Method for characterizing crosslinking performance consistency of crosslinked polyethylene 500kV cable insulation material

Abstract

The invention discloses a method for characterizing the crosslinking performance consistency of a crosslinked polyethylene 500kV cable insulation material, and belongs to the technical field of high voltage and insulation. The characterization method comprises the following steps: (1) preparing a standard sample: fully stirring and mixing low-density polyethylene and dicumyl peroxide at 63-67 DEG C, and standing to fully diffuse dicumyl peroxide into the low-density polyethylene; (2) testing a crosslinking reaction kinetic curve of the standard sample and the to-be-tested sample by adopting a torque rheometer; and (3) eliminating the difference introduced by different test points to the kinetic curve of the cross-linking reaction of the sample by using a standard sample transformation method. By utilizing the method, the cross-linking reaction characteristics of the cross-linked polyethylene 500kV cable insulating material are effectively represented, and the problem of accurate comparison of results of different test points is solved.

Description

technical field [0001] The invention relates to a method for characterizing the crosslinking performance consistency of crosslinked polyethylene 500kV cable insulating material, which belongs to the technical field of high voltage and insulation. Background technique [0002] The key to the production of 500kV XLPE cables is to realize the "zero" defect manufacturing of large-scale products for a long time, and the insulation materials of 500kV cables should also adapt to the characteristics and requirements of cable manufacturing. The biggest difference from 110kV and 220kV cables is that the insulation thickness and energy transport density of 500kV cables have been significantly improved. [0003] For thick insulation cables, cross-linking by-products need to be reduced to reduce outgassing time in the cable manufacturing process. This requires improving crosslinking efficiency under the premise of ensuring crosslinking properties, which is closely related to the molecul...

AI Technical Summary

Problems solved by technology

However, the crosslinking reaction kinetic curve is extremely sensitive to the test conditions, even if there are small differences in heat and shear, it will lead to significant differences in the test curves, making it difficult to compare the results of different test points. Institution A and institution B are tested (that is, different test points of A and B), the results obtained are different, and it is impossible to make a consistent evaluation of the crosslinking kinetics of the same material, and it is also impossible to make a comparison between the material producer and the user. Establish a unified technical standard system among

This has a great adverse effect on the research and development, production, inspection, acceptance and other links of cross-linkable materials.

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