CONCLUSIONS
N aiming to reducing SF6 gas usage, we applied SFb/N2 gas mixtures
I with extremely small SF6 content. To investigate PD and breakdown
mechanisms in the ultra-dilute SF6 gas mixtures with N2 gas under non-
uniform electric field, PDIV, PSIV, BDV, PD light emission image, PD
current and light intensity waveforms were measured. The obtained
results are summarized as follows:
1.Discharge characteristics at the SF6 content k10 ppm.
2.Positive PD exhibited the following transition with the increase in the
applied voltage: streamer +glow -tprebreakdown streamer.
CONCLUSIONS N aiming to reducing SF6 gas usage, we applied SFb/N2 gas mixtures I with extremely small SF6 content. To investigate PD and breakdown mechanisms in the ultra-dilute SF6 gas mixtures with N2 gas under non- uniform electric field, PDIV, PSIV, BDV, PD light emission image, PD current and light intensity waveforms were measured. The obtained results are summarized as follows:1.Discharge characteristics at the SF6 content k<10 ppm was almost equal to those in pure Nz gas. The influence of SF6 addition on PD and BD characteristics appeared at k>10 ppm. 2.Positive PD exhibited the following transition with the increase in the applied voltage: streamer +glow -tprebreakdown streamer.
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