Influence of Lossy Ground on High-Frequency Induced Voltages on Aboveground Pipelines by Nearby Overhead Transmission Lines

• Published in: IEEE transactions on electromagnetic compatibility Vol. 64; no. 6; pp. 1 - 10
• Main Authors: Martins-Britto, Amauri G., Papadopoulos, Theofilos A., Datsios, Zacharias G., Chrysochos, Andreas I., Papagiannis, Grigoris K.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.12.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Conductivity; Conductors; Earth; Earth conduction effects; Electromagnetic interference; electromagnetic transients; Frequency analysis; Frequency domain analysis; frequency-dependent soil models; Impedance; overhead lines; Pipelines; Soil; Soil properties; Soils; Transient response; Transmission lines
• ISSN: 0018-9375; 1558-187X
• DOI: 10.1109/TEMC.2022.3201874

The electromagnetic interference (EMI) of overhead transmission lines (OHLs) to aboveground pipelines sharing the same right-of-ways has been a research topic for many years. Most studies focus on investigations of the induced currents and voltages at the mains frequency (50/60 Hz). However, significant voltage levels can also be induced, when the pipeline is subject to high-frequency excitation. The representation of earth conduction effects is very important to estimate accurately the level of the EMI. This article presents a detailed high-frequency analysis of OHL/pipeline configurations taking into consideration the frequency-dependent (FD) soil properties. Wise's earth formulation is adopted for the calculation of the earth return impedances and shunt admittances. Propagation characteristics, frequency-domain, and transient responses are calculated by using both the FD soil models and constant soil properties, as well as the classical transmission line approach of Carson. Frequency-domain responses calculated with Wise's formulation are compared against those obtained using the MoM-SO method of EMTP software.