A network model of water tree

Author

Czaszejko, Tadeusz

Author_Institution

Dept. of Electr. & Comput. Syst. Eng., Monash Univ., Melbourne, Vic, Australia

fYear

1993

fDate

17-20 Oct 1993

Firstpage

726

Lastpage

731

Abstract

A computer model simulating the electrical properties of water trees has been developed. Tree-like patterns of various sizes, grown from a needle electrode, were generated by a random walk process on a rectangular grid of electrical impedances. The rate of change of the total impedance of the grid versus the size of the tree pattern was examined. This was compared with the experimental results of J.D. Cross and J.Y. Koo (1984). The computer model confirms that water in a water tree cluster is contained in a dispersed form. It is shown that, if water tree branches form interconnected, hollow channels, the number of unfilled voids in these channels must be greater than 30% for the changes in the admittance to be comparable with the changes in electric signal recorded by Cross and Koo. The quantity of water must be even smaller if polyethylene, instead of unfilled voids, separates microdrops of water

Keywords

electric admittance; electric breakdown; electric impedance; electrical engineering computing; random processes; trees (electrical); admittance; computer model; computer simulation; electrical impedances; electrical properties; microdrops; needle electrode; network model; polyethylene; random walk process; total impedance; tree-like patterns; unfilled voids; water tree; water tree cluster; Computational modeling; Computer simulation; Dielectric breakdown; Electrodes; Fractals; Laplace equations; Lattices; Mesh generation; Needles; Trees - insulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1993. Annual Report., Conference on

Conference_Location

Pocono Manor, PA

Print_ISBN

0-7803-0966-9

Type

conf

DOI

10.1109/CEIDP.1993.378887

Filename

378887