The mathematical modelling of experimental data for the design of anti-contamination insulators

Generally, new insulator designs are evaluated in a fog chamber by the trial and error method. Unfortunately, the mathematical equations which represent the flashover process are not considered, hence the profile achieved is not optimal. Research work was carried out in order to obtain experimental data to mathematically model the performance of a profile under polluted conditions. Equations describing the parameters (dry band phenomenon) involved in the flashover process, were established. To obtain these variables, a hollow cylindrical glass insulator was tested in a fog chamber, under various pollution levels. The equations were implemented in a computer programme. The computer programme was validated for a hollow glass insulator having a sandglass shape.