Abstract

This paper presents a numerical approach based on the finite element method for the estimation of AC interference on buried metallic pipelines sharing the same right-of-way of power transmission lines in presence of mitigation wires. The proposed approach relies on a hybrid technique in order to reduce the mesh size and, in turn, the computational time. The feasibility of the method is demonstrated with application to a standard interference configuration. Some tests were performed in order to assess how the position and material of the mitigation wires affect the induced current on a buried metallic pipeline.

Abstract

The focus of this paper is on the implementation and subsequent improvement of a technique for computing AC interference on buried metallic pipelines due to nearby power transmission lines. In order to perform this task, the finite element method (F.E.M.) is employed. After performing a description of the implementation of the classic F.E.M. approach, a hybrid technique designed to reduce the size of the mesh and therefore the computational time is presented. The results obtained with the two approaches are finally compared.

Abstract

This paper deals with the problem of AC interference on buried metallic pipelines located in proximity of HVAC power lines. A numerical technique for the assessment of the induced electromagnetic variables on the conductors of the right-of-way is introduced and applied to a realistic interference case, involving a non-parallel routing of the pipeline with respect to the power line. The presented approach is then employed to evaluate the efficacy of mitigation measures that can put in place to suitably lower the electromagnetic impact on the considered metallic pipeline. Finally, a dedicated interpolation technique is applied to the gathered data, and it is shown how it can consistently be used to extend the range of applicability of the computed results.