Study of the dielectric disruption in the insulators of the 69kv transmission line in ELEPCO S.A. through dynamic simulation

Abstract

The research consisted of analyzing the dielectric breakdown of insulators with superficial ruptures in a 69 kV transmission network through dynamic simulation. The study began with a 2D modeling of the suspension insulator ANSI type B C29.2-52-3 FOG using CAD software to define its properties and geometric dimensions. This model was exported to a dynamic simulation software called "FEMM", where it was necessary to define the electrical conductivity of each construction material of the insulator and apply an electrical voltage of 40 kV at the bottom of the insulator, while the reference voltage of 0 V was placed at the top. Five case studies were evaluated, each with different types of superficial ruptures. It was indicated that case 3 is the only one that presents correct functioning of the dielectric part of the insulator, despite having two superficial ruptures at the bottom. The electrical leakage current in that rupture does not exceed the limit current of 0.5128 amperes. On the other hand, cases 2, 4, and 5 present a dielectric breakdown that can cause electrical discharges. This is due to each of the leakage currents being higher than the limit current.