Keywords
cross-linked polyethylene insulation
treeing structure
electromechanical stress
three-dimensional computer modeling мультифизические процессы
сшито-полиэтиленовая изоляция
триинговые структуры
электромеханические напряжения
трехмерное компьютерное моделирование
How to Cite
Abstract
The three-dimensional distributions of electric field, electric forces, temperature and electromechanical stresses in microvolume of polyethylene insulation with the inclusions in the form of simplified water trees are studied. The quantitative dependences of these characteristics on the shape of the inclusions are found. The computer simulation is carried out by finite-element method. The computational results are verified by experiments. One of the destructive mechanisms at the microlevel, associated with the action of the electric force, which compresses the inclusion from all directions, and with the localization of electromechanical stress at the poles of the inclusions and at the peaks of treeing microchannels, is explained. The results are of practical importance in view of application, in recent years in the power system of Ukraine, of cross-linked polyethylene insulated cables for voltage up to 330 kV. References 14, figures 6, table 1.
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