Water treeing in insulating liquids

Author

Auckland, D.W. ; Chandraker, K. ; Golra, M.A. ; Varlow, B.R.

Author_Institution

Dept. of Electr. Eng., Manchester Univ., UK

Volume

142

Issue

2

fYear

1995

fDate

3/1/1995 12:00:00 AM

Firstpage

157

Lastpage

161

Abstract

Water has been found to migrate through an insulating fluid under the influence of a 50 Hz divergent electric field and to form tree-like structures of water-filled channels at points of high electrical stress. Growth was dependent on the presence of ions in the water in contact with the insulating liquid. Dielectrophoretic forces on such hydrated ions, in the nonuniform electric field between needle-plane electrodes, is believed to be responsible for the observed accumulation of water at the needle tip and the subsequent development of tree-like structures. These developments were influenced by the hydration factors of the ions present in the liquid. They were also influenced by the viscosity of the liquid as was demonstrated for a wide range, through the use of silicone fluids

Keywords

electric fields; electrophoresis; insulating oils; power cable insulation; silicone insulation; trees (electrical); accumulation of water; dielectrophoretic forces; divergent electric field; electrical stress; hydrated ions; hydration factors; insulating liquid; insulating liquids; needle tip; needle-plane electrodes; nonuniform electric field; silicone fluids; tree-like structures; viscosity; water treeing; water-filled channels;

fLanguage

English

Journal_Title

Science, Measurement and Technology, IEE Proceedings -

Publisher

iet

ISSN

1350-2344

Type

jour

DOI

10.1049/ip-smt:19951304

Filename

376931