Evaluation of induced AC voltages in underground metallic pipeline

Abstract

PurposeThe purpose of this paper is to make a study of electromagnetic interference between electrical power lines and nearby underground metallic pipelines.Design/methodology/approachThe equivalent electrical circuit of the studied electromagnetic interference problem between electrical power lines and nearby metallic pipelines is created and solved using a loop currents technique based on a hybrid method. The used circuit solving technique was implemented in a software application developed by the authors.FindingsThe authors have identified the influence of phase sequence on induced voltage level in an underground pipeline for a double circuit electrical power line. Also the effect of different normal operation and phase to earth fault currents have been revealed.Practical implicationsThe study has been made through a research project with the Romanian gas transportation company, in order to find the proper protection techniques for underground metallic pipelines.Originality/valueThe paper reveals the influence of some electrical and geometrical parameters that have not been studied in detail previously.

Analysis of the activation of spinal nerves during magnetic stimulation of the lumbar area

“…According to the electromagnetic field theory, the electric field inside the tissue can be computed by means of the scalar electric potential and the vector magnetic potential [2], [3], [4]:…”

“…The first term of the electric field is called "primary electric field", and it is due directly to the electromagnetic induction phenomenon, while the second term represents the "secondary electric field", due to charge accumulation on the tissue-air boundary [3].…”

Ac Corrosion on Pipelines: Influence of the Surface Layer Soil Resistivity in Evaluating the Current Density by a Probabilistic Approach

“…These algorithms are mainly based on the transmission line model for both inducing and induced plants. Afterwards, other algorithms based on Finite Element Method (FEM) have been proposed [10][11][12][13], and more recently, some theoretical evaluations of the AC induced corrosion risk have been presented in [14,15].…”

Electromagnetic interference from power lines on pipelines: influence of pipe insulating coating degradation

“…Since many years, a lot of papers and technical reports have been published on this topic; among them, we can mention [1][2][3][4][5][6][7][8][9][10][11][12]. Moreover, because of the evident similarities between this problem and the analogous one concerning the interference generated on telecommunication cables, we can also add [13,14].…”