Abstract
V-t characteristics of spacer surfaces for VFT were investigated under particle contaminated conditions for gas insulated switchgear (GIS). V-t characteristics for VFT were measured with the particle length, oscillation frequency, amplitude, and damping factor of VFT waveform as parameters. Differences in V-t characteristics for VFT due to variation of oscillation frequency, amplitude, and damping factor were small. Further, they were compared with V-t characteristics for lightning impulse. The dielectric strength of spacer surfaces for VFT was found to be at least equivalent to the dielectric strength for lightning impulse.
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