Characteristics of Self-Healing Processes in Metallized Film Capacitors with All-over and Segmented Electrodes

Segmented type of electrodes is widely used in modern metallized film capacitors due to its advantages in the case of dielectric breakdown and following self-healing process. However, the advantages of this electrodes type compared with all-over type are not obvious to a wide range of consumers. Characteristics of self-healing processes in metallized film capacitors with all-over and segmented electrodes in voltage overstress modes are presented in this paper. Electrical parameters of investigated capacitors: capacitance, dielectric losses and insulation resistance were measured during electrical aging process. The main reasons of metallized film capacitors failure depending on electrodes type were determined. Experimental results confirmed efficiency of metallized film capacitors with segmented metallization. It can be used in numerical simulation of self-healing processes and efficiency evaluation of different segmentation patterns.