Dielectric Strength of Different Gases in GIS
نویسندگان
چکیده
SF6 is a gas with excellent dielectric properties and is commonly used in gas-insulated equipment. However it has the high global warming potential. Thus, the development of new gases or gas mixtures for GIS, GIL is strongly desired. For dimensioning the gas insulated systems the support insulators (spacers) are of special interest. Contaminations on the insulator surface can cause field distortions and may lead to a significant reduction of the breakdown strength. To reduce the amount of used SF6, the gases CO2, N2 and dry air are examined as possible substitutes for SF6 at pressure range from 0.1 to 1 MPa. Their behaviour under AC and LI stresses is investigated. The study compares the breakdown characteristics of these gases and their mixtures in case of clean boundary surfaces as well as for the particle contaminated. A short introduction into the theory of gas discharge is given as well.
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