The influence of solid insulators upon flashover voltage and discharge development was investigated. A model arrangement was used which provided well defined interaction between gas and insulator and direct comparison of the predischarge phenomena with and without insulator. Great care was taken to exclude contamination of the insulator surface and triple-junction-effects. On these conditions, in N//2, a significant reduction of the flashover voltage by the spacer only occurred at a high gas pressure of 5 bar. The scatter of the measured flashover voltages is increased significantly. In SF//6 this will occur at much lower gas pressures and for the highest gas pressure investigated (2,4 bar) both reduction and scatter of flashover voltage are considerable.
|Number of pages||4|
|Journal||Conference Record of IEEE International Symposium on Electrical Insulation|
|State||Published - 1984|