Paper presents a calculation of the electric field distribution around the 400 kV transmission lines in power system of Bosnia and Herzegovina (B&H). Method of equivalent charges was used for the calculation of the electric field at arbitrary points in the vicinity of high-voltage transmission lines. Transmission lines with standard tower′s dimensions, as well as lines with reduced (compact) tower′s dimensions were considered. Comparisons between calculated and measured results of electric field values around the transmission line with the standard dimensions of the tower on 400 kV line Sarajevo 10 -Sarajevo 20 was performed.

Cathodic protection (CP) is a technique that prevents corrosion of underground metallic structures. Design of any CP system first requires defining the protection of current density and potential distribution, which should meet the given criterion. It also needs to provide, as uniform as possible, current density distribution on the protected object surface. Determination of current density and potential distribution of CP system is based on solving the Laplace partial differential equation. Mathematical model, along with the Laplace equation, is represented by two additional equations that define boundary conditions. These two equations are non-linear and they represent the polarization curves that define the relationship between current density and potential on electrode surfaces. Nowadays, the only reliable way to determine current density and potential distribution is by applying numerical techniques. This paper presents efficient numerical techniques for the calculation of current density and potential distribution of CP system based on the coupled boundary element method (BEM) and finite element method (FEM).

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