Numerical simulation of physical processes is an effective design method of new energy-intensive electric capacitor types. Polymer film capacitors are widely used in modern power equipment, because of their extremely high value of specific energy. As a rule, numerical simulation uses ideal geometric objects and physical conditions. This fact explains some difference between experimental and simulation results. This paper presents the application of randomization method in the study of electrophysical processes in metallized film capacitors’ electrodes. As an example of possible application, the numerical model of segmented capacitors electrodes’ electrothermal destruction during self-healing process is presented. The obtained results of numerical simulation have a statistical dispersion that correlates with the experimental data. Suggested randomization method is an addition to the research carried out in this scientific direction.