Effects of crosslinking byproducts on space charge formation in crosslinked polyethylene

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

92 Citations (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.

Original languageEnglish
Pages (from-to)90-97
Number of pages8
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Issue number1
Publication statusPublished - 2005 Feb


  • Charge trap
  • Crosslinked polyethylene
  • Crosslinking byproducts
  • Power cable
  • Space charge

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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