In the paper are evaluated the induced potential in pipeline based on the subdivision of the zone of influence AC Power Lines / electric traction line / gas pipeline, in a relatively great number of sections in order to be able to determine voltages at many positions along the gas pipeline. Is presented two practical cases, of subdivision of the zone of influence in sections (a circuit model) and is created a special interpolation algorithm and global interpolation functions for the precise calculation of the induced voltages values in different points on the pipeline taking into account the measured data. Because there are only a set of available reactance measurements, for a continuous function between the magnetic permeability and electrical induced currents, it is necessary to apply numerical interpolation methods and/or nonlinear curve fitting procedures.

Keywords: Interpolation algorithms, Induced voltages, Electromagnetic interferences, Power systems.