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A three-dimensional (3D) finite-element analysis model is established based on the structural characteristics of ±1100 kV oblique-dry-type smoothing reactor, to optimisation of the external insulation configuration thereof by the Comsol Multiphysics. The electric field on the grading ring and insulators surface is calculated and analysed. The results show that the electric field is extremely uneven and the electric field strength of the outer layer of the rain cover and the grading ring connected with the lowest layer of the main body is the largest around the whole model. Accordingly, it is proposed to enlarge the diameter of the outer layer of the grading ring, reduce the layer numbers of grading ring on the rain cover, and reduce the smoothing layer numbers of grading ring outside the insulation pillar: this should make the electric field distribution of the reactor surface more uniform. The experimental platform was established in Beijing Changping ultra-high voltage test base and causalcomparative tests of setup were undertaken to compare the external insulation characteristics of the smoothing reactor optimised with the original. The experimental results demonstrate that the switching impulse voltage of the smoothing reactor increases and the external insulation performance of the smoothing reactor are thus improved. [ABSTRACT FROM AUTHOR]

The aim of this paper is to present a numerical algorithm for investigating the dynamic characteristics of a simple model of the dielectric barrier discharge in air. The proposed algorithm is based on the finite element method and is capable of determining the distribution of electric field intensity and space charge density in the point-plane geometry, when the plane is covered with a thin dielectric layer and the needle is energized with a sinusoidal voltage. The simulation results show the behavior of corona current and space charge density for a few values of the input voltage and frequency. The aim of this parametric study is to investigate the effect of voltage, and frequency on the time variation of the discharge. [ABSTRACT FROM AUTHOR]

In this study, electric field effect was investigated by dry band arcing test method. ADSS (all-dielectric selfsupporting) cables are usually placed on power grids. These cables are affected by temperature and are exposed to many environmental effects such as wind and UV rays. In this study, the effect of water flow over ADSS cable on electric surface erosion on dry surfaces was investigated by electric arcing method, according to IEEE 1222 standard and the electric field intensity at the surface and the electric potential distribution were analyzed using the finite element method. [ABSTRACT FROM AUTHOR]