Mississippi State University
Ginn, Herbert L.
Date of Degree
Graduate Thesis - Open Access
Master of Science
James Worth Bagley College of Engineering
Department of Electrical and Computer Engineering
A growing trend in the electrical industry is to move away from overhead lines and towards underground distribution. The cables necessary for underground distribution are stressed in various ways, and one of the most ignored stresses is that of overvoltage caused by switching. The focus of this research is to determine the effects that high voltage switching impulses have on the electrical strength of medium voltage cable insulation. Accelerated aging was performed on multiple samples of XLPE and EPR cables by applying multitudes of switching impulses. At various stages of the aging process, partial discharge measurements were taken. At the end of the aging process, the ac breakdown voltage of each cable sample was determined. While more testing is necessary to gain a greater understanding of this subject, the results obtained in this study show that switching impulses weaken cable insulation, which may lead to premature failure of distribution cables.
Fulper, Jacob C (Jacob Curtis), "The Effects of Switching Impulses on the Partial Discharge Activity and Breakdown Voltage of 15 kv XLPE and EPR cables" (2009). Theses and Dissertations. 4446.