Interest of nonlinear ZnO/silicone composite materials in cable termination

Abstract

Downsizing medium or high voltage equipment requires the optimization of electric field distributions in the device and in the surrounding environment in order to master local high electric field strengths leading to partial discharges along the surface of the dielectric materials, prompting accelerated material ageing or in worse case dramatic failure. The purpose of this paper aims to compare for a cable termination both strategies namely resistive and capacitive (or dielectric refractive) field grading material where electrical passive or active fillers of same permittivity are respectively added to an insulation host matrix. Under both AC and transient regime, nonlinear resistive field grading shows a better effectiveness as far as electric stress control is of concern.

Imaging of nonlinear materials via the Monotonicity Principle

“…As well as magnetic materials, problem (1.1) is also a model for the steady currents problem involving nonlinear conductive materials. Nowadays, in addition to superconductors [6], materials exhibiting a nonlinear electrical conductivity are widely employed in field grading applications [7,8]. Furthermore, human tissues may exhibit a nonlinear electrical conductivity [9,10].…”

Benefit of Nonlinear Resistive Field Grading Materials on Medium Voltage Bushing by Finite Element Modeling (Flux 2D) vs Experimental Partial Discharge Measurements

“…Electric field grading materials (FGM) are commonly used in different applications like in rotating machines for corona protection [1][2], in power electronics [3] or electric equipment [4][5][6][7][8][9][10] to manage high electrical field in critical area. As a part of insulation coordination, i.e.…”