Power lines or underground power cables generate electromagnetic interaction with other objects near to them. This study evaluates the magnetic field emitted by underground extra high voltage cables. The presented work aims to show a numerical simulation of the magnetic field of a buried 400 kV underground power line, which is used as a novel prototype in several countries at a short distance. The underground power cable study, in the presence of the current harmonics at different positions, with time variation by finite element resolution, using Comsol Multiphysics with Matlab software in two dimensions. The simulation results illustrate the magnetic flux density variation-in terms of amplitude and distribution as a function of different actual harmonics rates. The underground cable performance and magnetic field have affected by the harmonics effects. The maximum magnetic induction levels generated by significant harmonics are superior to the limits recommended by the international standard norms. In this paper, shielding has been used as an appropriate remedy to attenuate the magnetic field.
This paper presents a method for modeling the interaction between lightning strokes and grounding grid in semi-infinite dissipative medium. We treat the two cases of direct and indirect effects of lightning strike. In the first case, we inject in the impact point of grounding grid a lightning current of Heidler's form, and we calculate the potential distribution, currents on the grid and the electromagnetic field it will emit. For the second case, we treat a problem of electromagnetic coupling to calculate the induced currents which are developed on the grounding grid illuminated by a lightning channel located in its vicinity. The lightning cannel is modeled as monopole antenna energized by current source at its base. The assessment of the induced current distribution is obtained by solving the Pocklington's equation of using the method of the moments. The transient electromagnetic field components are evaluated using a new method based on the concept of the hertzian dipoles and the asymptotic expansion of a single dipole.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.