Mitigation of the induced effects on double-circuit hybrid power network with T-pylons in the UK

Justo De Araujo, Anderson R., Albano, Maurizio ORCID: https://orcid.org/0000-0002-5486-4299, Clark, David ORCID: https://orcid.org/0000-0002-1090-2361, Robson, Stephen ORCID: https://orcid.org/0000-0003-3156-1487, Shaban, Muhammad, Guo, Dongshen and Haddad, Manu ORCID: https://orcid.org/0000-0003-4153-6146 2025. Mitigation of the induced effects on double-circuit hybrid power network with T-pylons in the UK. Presented at: UPEC 2025, London, UK, 02-05 September 2025. 2025 60th International Universities Power Engineering Conference. IEEE, 10.1109/upec65436.2025.11279961

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Abstract

This paper examines the induced electromagnetic effects on T-pylon transmission line caused by circuit coupling in a newly implemented 400 kV double-circuit power network in the United Kingdom. This system comprises interconnected segments of T-pylons, lattice towers, and underground cables. The study further evaluates the effectiveness of Drain Earth Shorting Scheme (DrESS) conductors in mitigating these effects by analyzing induced currents on earth wires, phase-to-ground induced voltages, and tower footing currents. The induced effects in the hybrid power network are investigated using ATP-EMTP assuming the pi-transmission line model, considering a soil resistivity of 100 Ω.m, and tower footing resistance of 3 Ω. The results indicate that induced currents on the ground wires of the energized side are consistently higher due to strong magnetic coupling. However, after the installation of DrESS conductors, a significant reduction is observed in the ground wire current on the non-energized side. Regarding induced voltages, a V-shaped distribution is identified along the T-pylon line, with peak magnitudes occurring at the endpoints. The application of DrESS significantly reduces the peak induced voltages while altering the overall voltage profile. Additionally, tower footing currents exhibit a U-shaped distribution, with peak values near transition points between T-pylons and lattice towers, as well as at underground cable junctions. The highest current is recorded at the final T-pylon, while the lowest values appear at segment midpoints. The installation of DrESS conductors effectively reduces tower footing currents at the initial T-pylons. These findings demonstrate that DrESS installation significantly mitigates induced voltages and currents on the non-energized circuit, enhancing safety for maintenance personnel working on T-pylons.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Published Online
Status:	In Press
Schools:	Schools > Engineering
Publisher:	IEEE
ISBN:	979-8-3315-6520-6
Last Modified:	07 Jan 2026 15:51
URI:	https://orca.cardiff.ac.uk/id/eprint/183689

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