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Partial discharge and breakdown mechanisms in ultra-dilute SF6 /N2 gas mixtures

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4 Author(s)
T. Yamada ; Dept. of Electr. Eng., Nagoya Univ., Japan ; T. Ishida ; N. Hayakawa ; H. Okubo

With the goal of reducing SF6 gas usage, we investigated partial discharge (PD) and breakdown (BD) mechanisms in ultra-dilute (0 to 1%) SF6/N2 gas mixtures. The experimental results and discussions are given in this paper. In particular, we focused our research on the transition characteristics of the electrical insulation performance with an extremely small amount of SF6 content, the PD behavior on the applied voltage, and the relation among prebreakdown streamer, return stroke and BD. Moreover, we discussed the PD and so mechanisms with reference of space charge behavior. From these results, the transition threshold at which the influence of SF6 gas on the discharge characteristics began to appear, was clarified to be SF6 content k=10 ppm for a total pressure of 0.1 MPa

Published in:

IEEE Transactions on Dielectrics and Electrical Insulation  (Volume:8 ,  Issue: 1 )