The influence of the number of ribs of a medium voltage post insulator on the electric field

This paper describes the designing of a medium voltage post insulator. The existing model of the insulator and examples of the insulator with lower and higher number of an insulator ribs is shown. The influence of different number of insulator ribs on the electric field is shown and the comparison of the insulator electric field strength is made between insulators with different number of ribs. In the designing of the insulator, the allowable values of electric field strength, that are defined with a standard, have to be achieved inside and nearby insulator. MATLAB software was used to design the insulator model. Calculations of electric field were in EleFAnT software. The optimization process was used to find the optimal number of insulator ribs.