Electric field distribution along the surface of high voltage polymer insulators and its changes under service conditions

Author

Souza, Ailton L. ; Lopes, Ivan J S

Author_Institution

Electr. Eng. Dept., Fed. Univ. of Minas Gerias, Belo Horizonte

fYear

2006

fDate

11-14 June 2006

Firstpage

56

Lastpage

59

Abstract

This paper investigates the electric field distribution along the surface of high voltage polymer insulators and its enhancement due to water droplets by means of computational simulations and laboratory experiments. Different factors affecting the electric field distribution are analyzed through finite element method simulations. Among them, the presence of a grading ring and water droplets on the insulator surface are studied. The insulator surface is simulated for dry conditions, as well as its changes under wet conditions. Additionally, radio-influence voltage (RIV) measurements are performed on a 138 kV polymer insulator. A model for the presence of humidity on the housing is presented and its effect on the field distribution is discussed. The results show that the electric field enhancement along the surface is considerable and reaches values that cause corona and early ageing of the material

Keywords

ageing; corona; finite element analysis; polymer insulators; voltage measurement; ageing; corona; electric field distribution; finite element method simulation; grading ring; high voltage polymer insulator; housing humidity; radio-influence voltage measurement; water droplet; Analytical models; Computational modeling; Dielectrics and electrical insulation; Distributed computing; Finite element methods; Laboratories; Performance evaluation; Plastic insulation; Polymers; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 2006. Conference Record of the 2006 IEEE International Symposium on

Conference_Location

Toronto, Ont.

ISSN

1089-084X

Print_ISBN

1-4244-0333-2

Type

conf

DOI

10.1109/ELINSL.2006.1665256

Filename

1665256