Modification of dependence of DC insulation resistivity of low density polyethylene (LDPE) on temperature and electric field using inorganic additives

M. Salah Khalil*, Joseph A. Jervase

*المؤلف المقابل لهذا العمل

نتاج البحث: المساهمة في مجلةمراجعة النظراء

ملخص

One of the reasons which has hampered the use of polyethylene (PE) as an insulating material for HVDC cables is the inherent dependence of its dc insulation resistivity ρv on temperature T and electric field E. The objectives of the present work are: (i) to investigate the possibility of modifying the dependence of the insulation resistivity ρv of LDPE on temperature and electric field by doping LDPE with an inorganic additive, and (ii) to find a mathematical model representing that dependence. Measurements of dc resistivity were made using relatively thick samples (approximately 2 mm) of undoped and doped LDPE at different electric fields ranging from 17 kV/mm to 33 kV/mm for temperatures from 50 °C to 80 °C. Results indicate that the use of the additive has a significant effect on the rate of decay of the insulation resistivity with temperature in the doped material. Based on these measurements, the dependence ρv = f(E,T) was found to conform to the law ρv = ρoe-[α*(E)T+β*(E)]. Nonlinear curve fitting was used to determine the coefficients α*(E) and β*(E). It is concluded that use of additives to LDPE can be a promising method for manufacturing insulating materials for HVDC cables.

اللغة الأصليةEnglish
الصفحات (من إلى)520-523
عدد الصفحات4
دوريةConference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report
مستوى الصوت2
حالة النشرPublished - 1998
الحدثProceedings of the 1998 67th IEEE Annual Conference on Electrical Insulation and Dielectric Phenomena. Part 1 (of 2) - Atlanta, GA, USA
المدة: أكتوبر ٢٥ ١٩٩٨أكتوبر ٢٨ ١٩٩٨

ASJC Scopus subject areas

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