XLPE cables are widely used in the power system; the aging behavior of XLPE cable insulation becomes the bottleneck of long-term safe operation of the power system. The urgent need is to study the law and mechanism of aging. Although the XLPE has good heat resistance and electrical properties, in actual long-term operations, cables are always under high temperature, physical and electrical properties of the insulating material are slowly changed. This article did the heat aging test of XLPE insulation material according to IEC 60287 Standard. With the help of nuclear magnetic resonance analyzer, the resonance peak integration area and longitudinal relaxation time are selected as the feature quantities to characterize the degree of aging of the insulation. The molecular structure of the insulation material is analyzed to obtain a more intuitive aging results while taking advantage of differential scanning calorimetry analysis of the different thermal aging of insulation material thermal performance analysis, determined the glass transition temperature, crystallinity and crystallization rate as index of thermal performance analysis techniques.
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