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Generally, as using the up-and-down method to research the discharge character of SF6 under impulse voltage, the requirement for dispersion of breakdown voltage is less than 3%, which guarantees the reliability of experimental data. But it is found that the dispersion of SF6 breakdown voltage, comparing with other gases, is usually large and even larger than 5%. This research has been still lack of...
In recent years, SF6/N2 was getting used as insulation medium in gas-insulated equipment for replacing pure SF6 which causes greenhouse effect. For the application of SF6/N2 in power equipment such as GIS and GIL, the breakdown characteristics of SF6/N2 in varying electric field non-uniformity under standard lightning impulse were studied in this paper based on an impulse experimental platform. The...
The non-standard lightning impulse waveforms (N-SLIWs) including oscillating lightning impulses, very fast transient voltages (VFTOs) and steep waveforms in the power system gravely endanger the inner insulation of power transformer. To prevent insulation failure and provide guidance for robust transformer design, in this paper, two typical insulation models of oil-immersed transformer were established...
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