Direct-current cable space charge distribution simulation method considering temperature and electric field gradient influence

Abstract

The invention relates to a direct current cable space charge distribution simulation method considering temperature and electric field gradient influence, and belongs to the technical field of directcurrent cable electrical performance research, and the method comprises the following steps: S1, building a two-dimensional physical model of a circular section of a direct current cable; s2, carryingout theoretical analysis of direct current cable insulation layer space charge injection; s3, carrying out theoretical analysis of space charge transport and accumulation in the insulating layer; s4,adding a physical field, and performing multi-physical-field coupling; s5, setting parameters and boundary conditions according to actual operation conditions; s6, carrying out mesh generation on themodel based on a finite element method, and obtaining direct-current cable insulation layer space charge and electric field distribution results under the action of different temperature gradients and electric field gradients through simulation. By adopting the method, the distribution characteristics of space charges and electric fields of the cross section of the cable insulation layer under the conditions of different materials, temperature gradients and electric field gradients can be obtained.

Description

technical field [0001] The invention belongs to the research field of insulation performance of electrical equipment, and relates to a simulation method for DC cable space charge distribution considering the influence of temperature and electric field gradient. Background technique [0002] High-voltage DC cables have the advantages of high operating temperature, high transmission power, light weight, and simple installation. They can effectively reduce power transmission losses and improve the utilization of existing lines. Therefore, the application prospects of DC cables are very broad. However, the development of DC cables is also facing great challenges: due to the disorder of the polymer topology, physical or chemical defects such as molecular chain dislocations and impurities are prone to occur during the material preparation process, forming traps of different depths, resulting in Accumulation of space charge. When the local charge accumulation in the cable insulati...

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Problems solved by technology

[0004] The one-dimensional transport model of ambipolar carriers has been widely used in the study of the dynamic behavior of space charges in polymer dielectric materials, but the one-dimensional model is quite different from the actual structure of the cable, and it is difficult to consider the influence of temperature gradient and electric field gradient. Influence of Space Charge Transport Properties

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