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This communication describes work and gives results focused on the application of Differential Scanning Calorimetry (DSC) to reveal the effect of thermal aging on the crystallinity variation of XLPE insulation cables. The changes in the crystalline phase of XLPE during aging at four different temperatures have been analyzed. This study shows also the effect of aging on the melting peak temperature Tm and melting enthalpy AHHm. The obtained results pointed out that thermal aging at temperatures above the melting temperature of XLPE have a great effect on the crystallinity variations.

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This article reports on the study of the thermal aging of poly(vinyl chloride) (PVC) used in mediumand high-voltage cables. It is shown that the thermal aging leads to the degradation of the material and to the modification of its electrical properties. The degradation is all the more important and faster as the temperature is high. This degradation is attributed to a progressive evaporation of the plasticizer at the beginning of aging and to a weight loss of stabilizer followed by a change in the color of polymer and a release of hydrochloric acid at more advanced stages of aging. It also results in a crosslinking of the material and a shrinking of samples.

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