Space charge behavior of chemically cross-linked and radiation cross-linked polyethylene

This paper presents results of an investigation having the aim to compare electrical and oxidative performances of chemically and radiation cross-linked polyethylene. Gamma irradiated and peroxide crosslinked specimens are characterized through dc space charge observations, as well as ac electric strength and oxidation induction time measurements. Similar results, in terms of space charge accumulation and electric strength, are found for specimens having the same gel fraction and obtained by chemical and radiation cross-linking, while longer oxidation times are derived for the latter. This confirms the interest in investigating deeply the possibilities related to gamma radiation crosslinking of polymeric energy cables