Negative LI Breakdown Behavior of Electrodes with Thin Dielectric Coatings in Dry Air at High Pressure

Conference paper (2014)

Authors

D. van der Born DC systems, Energy conversion & Storage -

P.H.F. Morshuis DC systems, Energy conversion & Storage -

J.J. Smit EEMS - General

A Girodet Alstom Grid

Research Group

DC systems, Energy conversion & Storage () (TU Delft)

GIS Breakdown Lightning impulse Thin coating Dry air

More Info

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http://resolver.tudelft.nl/uuid:940265fa-45cf-49c8-bc62-0b36aabcdfa3

Published Date

19-10-2014

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

DC systems, Energy conversion & Storage

Abstract

In gas insulated switchgear(GIS) SF6 gas is widely in use because it has good electrical insulation and arc interruption capabilities. Due to environmental constraints the desire to use alternative gases is continuously growing. This paper focuses on dry air as an alternative gas which unfortunately has a breakdown strength which is lower than the breakdown strength of SF6 at equal gas pressure. To improve the breakdown strength of dry air filled GIS, dielectric coatings can be applied to the electrodes. In this paper, the performance of GIS with thin coatings is evaluated through breakdown tests in a rod-plane electrode arrangement. Negative lightning impulse voltage is applied on the rod electrode and the gas pressure is kept constant at 0.9 MPa.