Mechanism of space charge formation in cross linked polyethylene (XLPE) under temperature gradient

Author

Zepeng Lv ; Junzheng Cao ; Xia Wang ; Haitian Wang ; Kai Wu ; Dissado, L.A.

Author_Institution

State Key Lab. of Electr. Insulation & Power Equip., Xi´an Jiaotong Univ., Xi´an, China

Volume

22

Issue

6

fYear

2015

fDate

12/1/2015 12:00:00 AM

Firstpage

3186

Lastpage

3196

Abstract

A bipolar charge transport model is used to simulate the formation of space charge in XLPE plaques placed under a temperature gradient. The model is used to assess the relative importance of charge migration and blocked extraction for three possible effects of the temperature gradient. The simulations were carried out for samples with different thicknesses and the results verified by comparison with experiment. In this way it has been shown that not only does the temperature gradient influence space charge accumulation through its introduction of a conductivity gradient, but also through differences in the injecting and extracting processes at electrodes of different temperature.

Keywords

XLPE insulation; electrical conductivity; electrodes; space charge; XLPE; bipolar charge transport model; cross linked polyethylene; electrode; space charge accumulation; space charge formation mechanism; temperature gradient; Electric fields; Electrodes; Ions; Polyethylene; Space charge; Temperature distribution; Temperature measurement; Space charge; XLPE; blocked extraction; heterocharge; temperature gradient;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2015.005278

Filename

7367512