Generation Mechanism of Partial Discharge in Different Kind of Pure Gases and Gas Mixtures with SF6
SF6 is widely used in electric power apparatus such as gas insulated switchgears (GIS), not only because of its superior dielectric properties, but also its chemically inert and nontoxic characteristics.1,2 However, it has several weak points; firstly, it has high liquified temperature. Secondly, its dielectric strength is drastically reduced by concentration of the electric field on insulation defects like metallic particles. Moreover, SF6 is the gas with high greenhouse effect. From these reasons, the development of new gas or gas mixture for the electrical insulation alternative to SF6 are strongly required and recently studied.2-4 Much studies on gas mixtures are done for breakdown characteristics under lightning impulse voltage application,5,6 while few study on partial discharge (PD) characteristics in gas mixtures are reported.
KeywordsCurrent Pulse Partial Discharge Electron Attachment Dissociative Attachment Critical Electric Field
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