Numerical evaluation of the induced voltages in an underground pipeline using the distributed source approach

Abstract

This paper presents the distributed source analysis approach for treating the inductive coupling of power transmission lines with buried pipelines. The evaluation of the induced voltages in a pipeline which share the same path with a power line for a monophasic short circuit on the line is performed and also the analytical expression for current density induced in soil is calculated. The paper describes a practical case of subdivision of the zone of influence in sections (a circuit model) and a precise calculation of the induced voltages in different points based on the measured data, is performed in Mathcad, using special interpolation functions.