Abstract
The predischarge phenomena in compressed SF6 gas have been investigated to clarify the flashover mechanism under the very fast transient overvoltages. Experiments were carried out for non-uniform electric field gaps with negative non-oscillating and oscillating impulse voltages. Predischarge current measurements and high-speed streak photographs showed that the back discharges under 2.2МНz oscillating impulse voltage occurred in the space charges, and leader propagation velocity was slower than that under non-oscillating impulse voltages. Flashover voltages under the oscillating impulse voltages were higher than those under the non-oscillating impulse voltages. As a result, the volt-time characteristic was affected by leader propagation velocity. The test results show that the lightning impulse test for GIS is sensitive to failure detection.
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Ishii, T. et al. (1991). Non-Uniform Field Flashover Characteristics in SF6 Gas under Negative Steep-Front and Oscillating Impulse Voltages. In: Christophorou, L.G., Sauers, I. (eds) Gaseous Dielectrics VI. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3706-9_29
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DOI: https://doi.org/10.1007/978-1-4615-3706-9_29
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