Calculation Of Electric Field Strength Research Articles

Calculation of electric field strength in the ionospheric F-region

In this study, we have calculated the electric field strength, Ey, of a plane electromagnetic wave with frequency, ?, propagation along z-axes and the polarized y-axes in 1-D by using Wentzel, Kramers, and Brillouin method for both with and without collision conditions in ionospheric F-region with regard to seasonal and local time. Also, the refractive index of ordinary wave and attenuation factor was computed for collision and collision-free conditions. When the collisions were calculated in the F-region of the ionosphere, it was observed that the electric field strength decreased for all seasons and Ey increased between 275-400 km altitudes encountering approximately hmF2 ?the peak of F2? for the accepted conditions.

Investigation of the Electric Field of Metallic Fence under a High Voltage Transmission Line

There could be areas near a high voltage power transmission lines where electric field strength can exceed maximum permissible values and could be harmful to workers. Territory of the open switch–gear with a metallic fence can be dangerous especially because the power line wires there are at a relatively low height. Therefore, it is important to know surely what the values of electric field strength are near a fence. The expressions for calculation of electric field strength at any observation point near the three-phase line with near the line set metallic fence dependently on the geometrical parameters of line and fence and the coordinates of observation point are presented in the paper. 2D approach is applied to implement the task. Values of electric field strength, obtained applying the analytical method, were compared with the numerically calculated ones. The comparison showed that difference between results obtained by analytical calculations and results obtained by numerical modelling is not greater than 10%. The results show that there is some area near the fence in which the electric field strength exceeds permissible values.DOI: http://dx.doi.org/10.5755/j01.eie.22.6.17218

Characteristics of grooved insulator flashover under pulsed voltage

The characteristics of grooved insulator flashover under pulsed voltage are discussed in this paper. The groove widths are determined by the secondary electron emission trajectory. The experiments results show that the flashover voltages increased while the insulator samples with 0.05 mm, 0.1 mm, or 0.7 mm wide grooves were used and the biggest voltage multiple was 1.4. The samples with 1 mm wide grooves had the same flashover voltage level as the flat ones. It is concluded that proper grooves design could increase the insulator flashover level by preventing the development of the secondary electron emission avalanche. Mechanism of inhibition was analyzed with calculation of electric field strength on the surface of insulator. Wider grooves, would trap the electrons and narrower ones would inhibit the motion of the initial electrons. Comparing the samples surface micrograms, a conclusion was given that the surface micro-flaw would drop the insulator flashover level.

Efficient Modeling of Three-Dimensional Reverberation Chambers Using Hybrid Discrete Singular Convolution-Method of Moments

Efficient modeling of a three-dimensional reverberation chamber (RC) is achieved by combining the discrete singular convolution (DSC) method and the method of moments (MoM). An RC usually consists of a metallic cavity and one or two conducting stirrers, whose size is normally small compared to the chamber size. The large cavity is efficiently modeled by the DSC method, and the stirrer is simulated by the flexible MoM. Exploiting the property of RWG basis, solutions from the two methods are combined together using the equivalence principle. The validity and advantages of the proposed hybrid technique are shown through comparisons with the commercial software FEKO. Employing the high efficiency of the DSC method, the hybrid technique can analyze one stirrer position of a medium-sized RC in a few hundred seconds on a single personal computer, for which FEKO needs thousands of seconds CPU time. The memory requirement of the proposed method is also less than that of FEKO. Furthermore, our hybrid method provides efficient calculation of electric field strength at a large number of field points, which is of great interest in RC analysis. Simulations show that our method only takes 1.7 seconds to compute electric field strength at 4026 field points.

PRECISE CALCULATION OF ELECTRIC FIELD AROUND CONDUCTOR OF EXTRA-HIGH-VOLTAGE TRANSMISSION LINES

One conventional method of increasing the capacity of power transmission lines and also decreasing the corona discharge in the vicinity of the conductor surface is to use conductor bundles. In such a case the high-voltage gradient surrounding the conductor is reduced. Calculation of electric field strength for bundle conductors is normally done by replacing these conductors with a single equivalent one. Using an equivalent conductor, the electric fields calculated on the surface and in the vicinity of the surface of bundle conductors are generally far from their actual values. This paper presents a new formulation based on image method for precise electric field calculation. It is used in the traditional algorithm for electric field calculation of bundle conductors, and the calculated values of the electric field for some cases are introduced and compared by the corresponding values presented in the references.

Electro-quasistatic calculation of electric field strength on high-voltage insulators with an algebraic multigrid algorithm

This paper is concerned with the numerical study of a new algebraic multigrid preconditioner for complex symmetric system matrices. The authors use several different Krylov subspace methods as an outer iteration, namely the quasi-minimal residual method of Freund and Nachtigal, the bi-orthogonal conjugate gradient conjugate residual method of Clemens, and the complex symmetric matrix structure method of Bunse-Gerstner and Stoever. The authors compare the results with the standard Jacobi-preconditioner and test their approach on the numerical simulation of high-voltage insulators.

Calculation of electric field strengths at a sharp edge

The sharp edge of a typical carbon-steel razor blade may be approximated by a hyperbola. The electric field at the vertex of the edge can then be calculated by the method of the conformal transformation. Equations are deduced for a blade above a plate and for a blade above a rod. The results are considered in relation to the use of blades in field ionisation mass spectrometry.