Electrical field modelling at the cable joints

Abstract

There is a large number of parameters that influence to the way of the producing cable joints, and therefore the greatest attention is paid on the electrical field density shaping. This is done in order to efficiently reduce electrical field density, especially the tangential electrical field component at the insulator surface. The described problem solving presents very important and complex task of high power technology for producing power cables and corresponding accessories. Finite elements method, finite difference method, charge simulation method, boundary relaxation method or boundary elements method can be applied for cable joints calculations, as well as equivalent electrodes method (EEM) [1, 2]. The simplest calculation can be carried out using equivalent electrodes method and it obtains very high accuracy of calculated values. Equivalent electrodes method is applied on non-modelled, as well as on some geometrically modelled cable joints, when they are assumed as deflectors of funnel form, which border lines can have elliptical shape, the shape of polynomial or exponential function, as well as the form generated as the combination of the shapes mentioned above. The results for the distribution of the electrical potential, radial and axial electrical field components are presented in the paper. The equipotential surfaces in the vicinity of cable joints are also presented.

Hybrid Boundary Element Method for Multi-Layer Electrostatic and Magnetostatic Problems

“…Cable terminations (Lupo et al, 1996;Raičević & Aleksić, 2010;Raičević, 1999) and cable joints (Raičević, 2007a) belong to the most sensitive parts of electrical power lines. The cable terminations are supposed to have small dimensions and very good service characteristics.…”