Keywords
macro-sized defects
electromechanical stress
equivalent tensile stress
three-dimensional computer modeling
How to Cite
Abstract
The electric field, electric force and electromechanical stress in the polyethylene insulation of power cables with typical defects at macro-level (with deep gash from the outer side of cable and crack in the insulation near the cable conductor) are studied by computer modeling. As shown, the concentration and maximum values of electric intensity, electric force and equivalent tensile stress as well as the exceeding of ultimate strength take place on the pointed end of the defects. Therefore the exclusion of defects in cable insulation is needed in the course of installation and operation of power cables. The results of the work are of practical importance in view of wide application and long-term service of XLPE (cross-linked polyethylene) insulated power cables in Ukraine and all over the world. References 15, figures 4.
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