**3.1 Studied electromagnetic interference problem**

An underground gas transportation pipeline runs in the same right of way with a 220kV/50Hz electrical power line (figure 18). In order to study more realistic problem geometries is considered a multilayer soil (three vertical layers) with different resistivities.

Fig. 18. Right of way configuration

The pipeline is considered to be buried at 2 m depth and having an 0.195 m inner radius, 5 mm thickness and 5 cm bitumen coating. The EPL phase wires are placed on triagonal single circuit IT.Sn102 type towers with one sky wire.
