A fabrication method for adaptive dielectric gradient insulating components

Abstract

Dielectric gradient components have advantages in electric field mitigation and insulation improvement. In this paper, we propose a fabrication method for adaptive dielectric gradient components using in situ AC electric field, including the mechanism and the corresponding operational procedures for industrial applications. Based on the electric polarisation and self‐assembly effect of the filler particles in the liquid matrix, the chain‐like structure in the high field strength region is constructed to enhance the local permittivity and mitigate the maximum of the spatial electric field. The dielectric gradient basin insulator is prepared by this method, and its flashover voltage is increased by 12.8% compared with that of a homogeneous dielectric basin insulator, and the improvement is 20.8% when metal particles are present on the surface. The more non‐uniform the initial electric field is, the greater the improvement in flashover voltage. This method is expected to promote the industrial application of dielectric gradient insulating components.

The mechanism of tuning filler orientation degree in composites based on AC electric field assist: from microscopic dynamical model to macroscopic electrical properties

“…Upon applying a voltage, the particles are electrically polarized, resulting in the segregation of internal positive and negative charges, thereby manifesting as dipoles. In adherence to the principle of minimal energy, the particles proceed to undergo rotation along the direction of the electric field, subject to the influence of the inertial force, the viscous damping exerted by the mixture, and the electric field force [28]. The motion equation governing this process is expressed as follows [29]:…”

A method for detecting two‐dimensional plane stress distribution in basin‐type insulator based on critically refracted longitudinal wave

“…By Snell's law, when the incident angle (α) for LCR wave is 1°greater than the first critical angle (θ LCR ), the LCR wave is excited, which propagates below the material surface with the depth D determined by the frequency of the ultrasonic transducer [28]. L is the propagation distance of the LCR wave in the material and θ LCR can be calculated by Equation (4).…”

“…As the voltage level of power systems continues to rise, gasinsulated switchgear (GIS) is being used more and more extensively [1][2][3]. The basin-type insulator made of epoxy resin (EP) is the core component of GIS, playing the role of insulation and supporting, which determines the performance of GIS [4][5][6][7].…”