AC interference from a faulty power line on nearby buried pipelines: influence of the surface layer soil

Reduction in the Electromagnetic Interference Generated by AC Overhead Power Lines on Buried Metallic Pipelines with Screening Conductors

“…The right-hand side of Equation (2) includes the term J 0,z in Equation ( 1) and the boundary conditions for the considered quasi-magnetostatic problem. Hence, Equation (2) expresses the relation between the impressed current densities (i.e., J 0,z ), acting as forcing terms for the differential problem, and the magnetic vector potential distribution in the given section of the corridor. Hence, the finite element approach is employed to take into account the physical contribution provided by electric fields (and hence current densities) in the direction perpendicular to each section of the corridor, i.e., along the power line path.…”

“…Metallic pipelines located in the proximity of power lines can be exposed to electromagnetic interference during both normal operating conditions and faults of the latter [1][2][3]. Because of the high cost of right-of-ways, it is in fact unavoidable that the pipelines share the same corridor with high-voltage AC (HVAC) power lines [4][5][6].…”

AC interference from faulty power cables on buried pipelines: A two‐step approach

“…where ρ 1 and D are the top layer resistivity and thickness respectively, while ρ 2 is the bottom soil resistivity. It is necessary to point out that Equation 15is based on the assumption that the power cable has been replaced by an equivalent inducing conductor that carries the current I eq (S) obtained according to Equation (13). That is justified because the distances between the power cable conductors range from some centimetres (trefoil disposition) to some decimetres (flat disposition) and normally they are much smaller than the smallest distance between power cable and pipeline (at least 1-2 m).…”

Laplace Transform for Finite Element Analysis of Electromagnetic Interferences in Underground Metallic Structures

“…In either case, however, fundamental requirements for such modeling tools include the capability of taking into account variations in the soil resistivity [17,18], non-parallel pipeline-power line routings [19], and the presence of multiple metallic conductors, such as mitigation wires [20]. Finally, the majority of the currently employed numerical techniques are developed under the assumption of a sinusoidal steady-state [21][22][23]. Indeed, since the 2D FEM simulations of this kind of physical configuration require meshes that are both large and detailed [19], the adoption of time-marching procedures would result in substantial computational loads.…”