The influence of sag in the electric field calculation around high voltage overhead transmission lines

The method of calculation of the electric field assumes that the current carrying power line conductors are straight horizontal wires. This assumption results in a model whose electric fields are distorted from those produced in reality. The influence of the geometry of the overhead line is largely noticed for the calculation of the electric field especially in the vicinity of the half span where the electric field becomes very significant. This paper presents a calculation of electric field distribution at the ground level, near of the overhead lines. To confirm our results we have calculate the electric field by three methods, the first is a software package based on Charge Simulating Method. This result is confirmed by another numerical calculation based on the use of two vectors expressing the point of calculation, this numerical method express the pace of the drivers by using the mathematical form of each phase. As third method of confirmation of result, we used a computation software named Flux 3D based on the use of the finite element method; where the shape of the drivers of phase is described by the geometrical form of the phases.