Correlations between Physico-Chemical Properties and Dielectric Behavior of Thermally aged XLPE Cables Insulation

ENP Engineering Science Journal

article

Yasmina Sebbane¹  Ahmed Boubakeur¹  Abdelouahab Mekhaldi¹ 

[1] Ecole Nationale Polytechnique

关键词: Cross-linked Polyethylene;    Cristallinity;    Thermal aging;    Dielectric losses.;   

DOI  :  10.53907/enpesj.v2i1.102

学科分类：社会科学、人文和艺术（综合）

来源: Ecole Nationale Polytechnique

【 摘 要 】

The carried out investigations aim at clarifying the correlations between physico-chemical properties and thevariation of dielectric losses of Cross-Linked Polyethylene (XLPE) as Medium Voltage cable insulation during thermalaging. The used cables were manufactured by ELSEWEDY CABLES. They have been installed in Algeria where theymust resist high temperatures that could exceed 50 degrees in the south of the country. For this aim, thermal agingmeasurements were performed on XLPE cables samples at 80, 100 and 140 °C for aging time of 5000 hours. The chemicalproperties were evaluated through Fourier Transform Infrared Spectrum (FTIR). In addition, the effect of aging on thecrystallinity ratio, the lamellar thickness and the melting peak temperature was assessed using Differential ScanningCalorimetry (DSC). Frequency domain dielectric spectroscopy has been conducted on the aged XLPE cables in order tostudy the evolution of the dielectric losses. The obtained results showed that the principal aging mechanism is thermaloxidation which heads to deteriorate the morphology and increase both the polarization and losses, principally at lowfrequencies. It has been found that the color changes caused by the chains scission indicate the increase of interfacesbetween the cable insulating and semi-conductive layers, which could head to increase the dielectric losses due to theinterfacial polarization.

【 授权许可】

CC BY-NC-SA