Ionization coefficient approach to modeling breakdown in nonuniform geometries.

[摘要] This report summarizes the work on breakdown modeling in nonuniform geometries by the ionization coefficient approach. Included are: (1) fits to primary and secondary ionization coefficients used in the modeling; (2) analytical test cases for sphere-to-sphere, wire-to-wire, corner, coaxial, and rod-to-plane geometries; a compilation of experimental data with source references; comparisons between code results, test case results, and experimental data. A simple criterion is proposed to differentiate between corona and spark. The effect of a dielectric surface on avalanche growth is examined by means of Monte Carlo simulations. The presence of a clean dry surface does not appear to enhance growth.

[发布日期] 2003-11-01 [发布机构] Sandia National Laboratories

[关键词] Breakdown;Electric Spark.;Dielectric Materials;Simulation Finite Geometries.;Finite Geometries.