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Dynamics of metallic particle contaminants in GIS with dielectric-coated electrodes

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4 Author(s)
Morcos, M.M. ; Kansas State Univ., Manhattan, KS, USA ; Zhang, S. ; Srivastava, K.D. ; Gubanski, S.M.

Electrical insulation performance of compressed gas insulated switchgear (GIS) and gas insulated transmission line (GITL) systems is adversely affected by metallic particle contaminants. Dielectric coatings applied to the inside surface of the outer enclosure of a coaxial GIS/GITL system improve the insulation performance in several ways. Coating has the effect of smoothing the electrode surface and reducing the prebreakdown current in the gas gap. Also, the electrostatic charge acquired by a particle is reduced and hence the range of its motion under an applied power frequency field is inhibited. The movement of such particles is complex and dependent on several parameters. In this paper the dynamics of wire particles in a coaxial system under AC voltage is studied when the inside surface of the outer enclosure of a coaxial GIS/GITL system is coated with a high resistance material. Suggestions for reducing the particle excursion in GIS/GITL systems are discussed

Published in:

Power Delivery, IEEE Transactions on  (Volume:15 ,  Issue: 2 )

Date of Publication:

Apr 2000

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