Open AccessThe electrical trees that developed in inner and outer layer of XLPE cable insulation
Author(s) -
Zheng Xiao-quan,
Ansheng Xie,
Shengtao Li
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.5494
Subject(s) - electrical treeing , materials science , composite material , power cable , layer (electronics) , voltage , high voltage , polymer , high voltage cable , partial discharge , electrical engineering , engineering
Due to the limitations of specific insulation structures and the influence of technical processthe growth of electrical trees in high-voltage power equipments with polymer as main insulation materials is more complicated than those in uniform materialsespecially in equipment employing semi-crystalline polymerso it is difficult to characterize by mathematical means. The experiment reported in this paper is the first attempt to focus on the electrical treeing rules in both inner and outer insulation layers of high-voltage XLPE power cable. Through statistical experiments and the SEM observationlarge difference in treeing character between the inner and outer layers of cable insulation due to the different crystalline status are found. Electrical trees initiating in the inner layer of insulation has shorter initiation timehigher growth rate and greater variety of shapes compared than in the outer layers. The initiation and propagation mechanisms are also discussed.