Abstract
An investigation was made of the 60 Hz, lightning and switching impulse breakdown voltage of coaxial electrodes in compressed SF6. The inner conductor was smooth and the outer electrode was smooth or corrugated, the latter simulating the corrugated enclosure to be used on flexible compressed gas insulated transmission lines now under development. The results indicated that for pressures above 100 kPa the corrugation became critical in initiating positive impulse breakdown at values below those for the smooth outer electrode. No similar effect was detected with 60 Hz or negative impulse voltages. Analysis of the results to include the effect of field enhancement due to surface roughness showed good agreement with the experimental results.
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