Effects of crosslinking byproducts on space charge formation in crosslinked polyethylene

Yasumasa Maeno*, Naoshi Hirai, Yoshimichi Ohki, Toshikatsu Tanaka, Minoru Okashita, Takashi Maeno


研究成果: Article査読

82 被引用数 (Scopus)


Space charge is formed in cables insulated with crosslinked polyethylene. It has not been clear whether the crosslinking byproducts or the crosslinked polymer morphology is responsible for the space charge formation. In order to clarify this point additive-free non-crosslinked low-density polyethylene, additive-free crosslinked polyethylene, and degassed crosslinked polyethylene were soaked in the crosslinking byproducts and the space charge distribution was measured after dc voltage application. Samples tested are divided into two categories. The first category is a soaked single-layered sheet and the second category is a two-layered specimen consisting of a soaked sheet and a non-soaked sheet. As a result, the following conclusions were obtained. (1) Cumyl alcohol is responsible for homo-charge layers in front of the electrodes in both low-density and crosslinked polyethylene sheets. (2) Acetophenone is responsible for hetero-charge formation in crosslinked polyethylene, presumably as a synergistic effect with water. (3) α -methylstyrene has no effect on space charge formation in low-density polyethylene, while it assists charge trapping in crosslinked polyethylene. (4) Charge trapping occurs easier in degassed crosslinked polyethylene than in low-density polyethylene, probably because of carbonyl groups induced by crosslinking.

ジャーナルIEEE Transactions on Dielectrics and Electrical Insulation
出版ステータスPublished - 2005 2月

ASJC Scopus subject areas

  • 電子工学および電気工学


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