Keywords
conductor screen
manufacturing and operational defects
porous structure
three-dimensional models
multiscale modeling сшито-полиэтиленовая изоляция
полупроводящий слой по жиле
технологические и эксплуатационные дефекты
пористая структура
трехмерные модели
многомасштабное моделирование
How to Cite
Abstract
The electric field distributions in the cross-linked polyethylene (XLPE) insulation of power cable with defects in the conductor screen at macro- and microlevels are studied using multiscale modeling. The surface roughness, protrusion of the screen into the insulation and bridging channel in the conductor screen as macro-sized defects as well as the porous structure of the screen as micro-sized defect are modeled and examined. The electric problem for macrodefects is coupled with the problem for microdefects solved in the appropriate region of the screen. The considerable electric field enhancement near the defects is revealed by numerical simulation. From such view point, the degradation of the insulation in its local regions with the potential formation and growth of water trees is explained. References 11, figures 5.
References
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