Free Conducting Particles in a Coaxial Compressed-Gas-Insulated System
- 1 November 1970
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Apparatus and Systems
- Vol. PAS-89 (8), 1970-1978
- https://doi.org/10.1109/tpas.1970.292781
Abstract
The effect of free conducting particles (FCPs) on the voltage-insulating performance of a short length of transmission line was quantitatively studied over the pressure range 0 to 300 psig for nitrogen and 0 to 125 psig for SF6. The FCPs were selected aluminum filings deliberately inserted into the concentric cylindrical (3"×10" dia.) electrode system. DC voltages of either polarity were produced by a Van de Graaff generator. The observed forms of interelectrode current included intermittent pulses or 'bursts', 'fireflies', steady corona, and sparks. Up to five-fold reductions in the current-onset voltage insulating strength resulted from the introduction of FCPs. For pressures up to 75 psig the sparking voltage in SF6 was 4 to 5 times higher than the sparking value in nitrogen. An electrostatic particle trap proved effective in reducing FCP-caused discharges. The dynamic equilibrium mechanism of 'fireflies' was studied in detail.Keywords
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