The influence of freely moving wire particles on 60-Hz AC surface flashover of epoxy and acrylic disk spacers in a 76/250 mm coaxial system was examined in sulfur hexafluoride gas at pressures of 300 and 500 kPa. The experimental results show that 0.45-mm-diameter aluminium wire particles, 6.4 mm long, will lift and reach a nearby spacer at voltages comparable to system operating voltage. The combination of metallic particles and spacer does not reduce the breakdown voltage below that for free particles without a spacer unless a particle is lodged on the spacer very close (>
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Chakrabarti et al. (1989) studied this question.
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