Analysis and experimental work on cavity defects in solid insulation

Author

Gouda, O.E. ; El-Dessouky, S.S.

Author_Institution

Dept. of Electr. Eng., Cairo Univ., Egypt

fYear

1990

fDate

3-6 Jun 1990

Firstpage

217

Lastpage

220

Abstract

The repetition rate and magnitude of internal discharges in artificial cavities in samples of XLPE (cross-linked polyethylene) were investigated. The effect of cavity diameter and of filling it with different materials with different conductivities and permittivities was studied. It is shown that, in general, increasing the applied voltage increases both the repetition rate and the magnitude of discharges (conduction current pulses in milliamperes). It is also shown that the foundation of cavities reduces the breakdown voltage. Samples of polyvinyl chloride and polystyrene were also used in these tests. It is concluded that the number of discharges per second increases with decreasing cavity diameter

Keywords

electric breakdown of solids; insulation testing; organic insulating materials; permittivity; polymers; XLPE; artificial cavities; cavity defects; cavity diameter; conduction current pulses; conductivities; filling; internal discharges; magnitude; permittivities; polystyrene; polyvinyl chloride; repetition rate; solid insulation; Circuit testing; Conducting materials; Detectors; Dielectrics and electrical insulation; Electrodes; Materials testing; Pulse measurements; Shape; Solids; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 1990., Conference Record of the 1990 IEEE International Symposium on

Conference_Location

Toronto, Ont.

ISSN

1089-084X

Type

conf

DOI

10.1109/ELINSL.1990.109744

Filename

109744