Influence of GIS parameters on the Topler constant

An experimental study of formative times and the Topler's constant approach to modeling the breakdown event is presented. The authors deal with the dependence of formative time and Topler's constant on the macroscopic parameters of the insulation. Results obtained were statistically treated and the Topler's constant dependence on the quoted parameters was determined. It was found that some insulator parameters (gas type, pressure, degree of inhomogeneity of electrical field) influenced the value of Topler's constant, and that some other insulator parameters (electrode material, roughness of electrode surface) did not influence the value of Topler's constant. The observed influence of insulator parameters on the value of Topler's constant was not quantitatively significant. On the basis of the experimental results one can conclude that it is valid to apply Topler's law in modeling the electrical breakdown for SF/sub 6/ and gas mixtures SF/sub 6//N/sub 2/, SF/sub 6//Ar under the tested conditions.>