Electric-Field Distribution in Polymer–Gas Insulated Power Lines for Offshore Electrical Systems

This study presents the results of studying the electric-field distribution in current leads with combined polymer–gas insulation, which are designed for transmitting electricity from offshore wind turbines. The main stages of calculation are preliminarily established. The current lead design areas, that are the most difficult to calculate, are determined. The current leads of the considered type are intended for routing in the sea to transmit electricity from wind turbines, where current-conducting members coated with polymer compounds are used to increase the electrical strength and reduce the current-lead dimensions, and basic gas insulation is used to reduce electricity losses. A mathematical model has been developed, and the distribution of electric potential and intensity inside the layer of combined solid–gas insulation is calculated. The nature of the change in the electric intensity in the insulating layers of the current leads is determined, and conclusions are drawn about whether the characteristics of the combined polymer–gas insulation are sufficient for its practical use.