2-D Simulation of Cathode-Directed Streamer in SF₆/N₂ Gas Mixtures

Abstract:

SF₆ has been widely used in the power industry as an arc quenching and insulation medium due to its excellent physical and chemical properties since 1960. However, experience shows that SF₆ gas medium has many disadvantages under certain conditions: gas may encounter liquefaction when installed in cold areas; SF₆ is still expensive; dielectric strength is sensitive to electric field, and require higher equipment design and manufacturing processes; SF₆ is a greenhouse gas, and is used under limitations since the Kyoto Protocol was signed in 1997^[. Unfortunately, its difficult to find no environment hazards and to replace SF₆ completely at present. In view that the greenhouse impact of SF₆ is still very little (it is estimated less than 0.01%) in the atmosphere recently and it does not damage the ozone layer, it becomes a focus to find gas mixtures containing SF₆ to replace pure SF₆ gas to reduce the emissions and environmental impact of SF₆. Scientists from all countries and international major GIS manufacturers, electric power sector are working together to develop new gas mixture of SF₆-insulated electrical equipment ^[2].

• Periodical: Advanced Materials Research (Volume 905)
• Pages: 427-431
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.905.427
• Online since: April 2014
• Authors: Meng Li*, Rui Qi Wang, Jun Peng Zhang, Dong Wang, Dong Cao
• Keywords: Cathode-Directed Streamer, Flux-Corrected Transport, Gaseous Dielectric, SF₆/N₂ Gas Mixtures, Simulation

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