Phenomena and mechanism of electric charges on spacers in gas insulated switchgears

The phenomenon of accumulated charges on solid insulator surfaces is one of the critical parameters to consider at the insulation design stage, for AC electric power equipment as well as for DC equipment, so it is important to investigate the characteristics and predominant factors underlying variou...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2007-02, Vol.14 (1), p.46-52
Main Author: Okabe, S.
Format: Article
Language:English
Subjects:
Charge
Charging
Dielectrics and electrical insulation
Electric charge
Electric fields
Electric resistance
Electric variables measurement
Electrical resistance measurement
Gas insulation
Insulation
Insulators
Mathematical models
Solids
Spacers
Surface charging
Surface resistance
Switchgear
Temperature
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Summary:The phenomenon of accumulated charges on solid insulator surfaces is one of the critical parameters to consider at the insulation design stage, for AC electric power equipment as well as for DC equipment, so it is important to investigate the characteristics and predominant factors underlying various charging mechanisms. Several researches related to this theme have been reported, but independently, and cross-sectional comparison and evaluation from a unified viewpoint are meaningful. In this paper, the resistance of solid insulator is first discussed, showing that the resistances found by diverse measurements are in a fairly good agreement under similar conditions of the temperature and electric field. Next, three kinds of electric charging mechanisms, i.e. volume conduction, surface conduction and electric field emission are characterized in terms of the time constant, applied voltage and charge distribution. Then, eight cases of recent measurements on the charging time are investigated and their charging mechanisms are classified. Electric field emissions are likely to occur with model spacers made in routine GIS manufacturing process at the electric field level used. Further, three examples in cases with metallic particles are introduced, of simulating charge from edge on the tank, spacer surface charging phenomena, and influence of charge on spacer surface flashover. It is expected that this paper wilt be helpful for understanding charging phenomena e.g. on insulation spacers in gas insulated switchgears
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2007.302871