Analysis of Multi-Circuit Overhead Transmission Lines Zone of Influence from the Aspect of Extremely Low Frequency Magnetic Fields Based on the Use of Artificial Neural Networks

Abstract Overhead transmission lines that consist of two or more circuits are frequently utilized as a solution in scenarios requiring the transmission of a higher amount of energy per unit of space, when spatial constraints exist, or to achieve cost savings in the construction and maintenance of transmission infrastructure. Despite their numerous advantages, these overhead transmission lines pose significant challenges concerning the intensity of magnetic fields in their vicinity. This paper presents an analysis of the influence zone of multi-circuit overhead transmission lines from the perspective of magnetic fields in the range of extremely low-frequencies. The zone of influence, in this context, is defined as the area surrounding the overhead transmission lines where the magnetic flux density exceeds specified reference values. To determine the magnetic flux density values, a methodology based on the application of artificial neural networks (ANNs) was employed. The paper outlines the implementation of this ANN based approach to estimate the magnetic flux density near multi-circuit overhead transmission lines. Two case studies are presented, examining double-circuit overhead transmission lines that have different configurations and rated voltages. For these cases, the zones of influence were determined with respect to extremely low-frequency magnetic field values. Additionally, a comparison was conducted between the obtained influence zones and the safety zones for overhead transmission lines defined by regulatory authorities.