Influences of Electric-Field Distribution Along the String on the Aging of Composite Insulators

Author

Youping Tu ; Hui Zhang ; Zhuo Xu ; Jingjing Chen ; Conghui Chen

Author_Institution

Key Lab. of Power Syst. Protection & Dynamic Security Monitoring & Control, North China Electr. Power Univ., Beijing, China

Volume

28

Issue

3

fYear

2013

fDate

Jul-13

Firstpage

1865

Lastpage

1871

Abstract

This paper studies the uneven aging of the composite insulators along the string caused by the nonuniform electric-field distribution. Sheds along the string of two 110-kV composite insulators with varied operation time on transmission lines are analyzed systematically by means of hydrophobicity and thermally stimulated current (TSC) tests, and the aging characteristics of different part of the axial sheds are compared. This paper studies the influences of the electric-field distribution along the string on the aging of composite insulators, combined with the results of electric-field simulation and electric aging tests. Results show that the higher the electric-field strength is, the worse the hydrophobicity of composite insulators surface is and the larger the amount of trap charge is. The study suggests the nonuniform electric-field distribution is the main reason for the uneven aging of the sheds along the composite insulators string.

Keywords

ageing; composite insulators; electric fields; hydrophobicity; aging characteristics; axial sheds; composite insulators aging; composite insulators string; electric aging tests; electric-field distribution; electric-field simulation; electric-field strength; hydrophobicity; nonuniform electric-field distribution; thermally stimulated current tests; transmission lines; voltage 110 kV; Aging; Corona; Rough surfaces; Rubber; Surface discharges; Surface roughness; Composite insulators; contact angle; electric-field distribution; hydrophobicity; thermally stimulated current (TSC);

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2013.2244103

Filename

6507356