A set of models for investigation of voltage distribution along suspension insulator string

Suspension insulator string is widely used as insulator structures in high voltage overhead power lines. Power frequency voltage of feed line is distributed along string elements in unequal amounts due to parasitic capacities (on ground and wire). Grading rings arrangement close to current-conducting elements is one of the most effective ways for voltage grading. The results of investigation of voltage distribution along insulator string based on the following models set are presented in the article: real string in high voltage laboratory, string physical model based on lumped elements, mathematical model in software package. Two-dimensional axially symmetric model of insulator string based on finite element analysis was developed in ActiveField software package. The results of optimality calculation for selection of grading ring arrangement height are presented and analyzed. Comparison and analysis of theoretical and experimental data were carried out on the base of investigation results.