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Open AccessArticle

Analytical Description of Overhead Transmission Lines Loadability

Department of Industrial Engineering, University of Naples Federico II, 80125 Napoli, NA, Italy
Department of Electrical Engineering and Information Technology, University of Naples Federico II, 80125 Napoli, NA, Italy
Department of Engineering and Architecture, University of Trieste, 34127 Trieste, TS, Italy
Author to whom correspondence should be addressed.
Energies 2019, 12(16), 3119;
Received: 19 July 2019 / Revised: 9 August 2019 / Accepted: 11 August 2019 / Published: 14 August 2019
(This article belongs to the Special Issue DC and AC Overhead Transmission Lines from Low to Extra-High Voltages)
PDF [3257 KB, uploaded 15 August 2019]


The loadability characteristics of overhead transmission lines (OHLs) is certainly not a new topic. However, driven by sustainability issues, the increasing need to exploit existing electrical infrastructures as much as possible, has given OHL loadability a renowned central role and, recently, new investigations on this subject have been carried out. OHL loadability is generally investigated by means of numerical methods. Even though this approach allows deducing useful information in both planning and operation stage, it does not permit to capture all the insights obtainable by an analytical approach. The goal of this paper is to tailor a general analytical formulation for the loadability of OHLs. The first part of the paper is devoted to the base-case of uncompensated OHLs. Later, aiming to demonstrate the inherent feasibility and flexibility of the novel approach proposed, the less frequent case of shunt compensated radial OHLs is investigated as well. The analytical formulation is combined with the use of circular diagrams. Such diagrams allow a geometrical interpretation of the analytical relationships and are very useful to catch the physical insights of the problem. Finally, in order to show the applicability of the new analytical approach, a practical example is provided. The example concerns calculation of the loadability characteristics of typical 400 kV single-circuit OHLs. View Full-Text
Keywords: power transmission; transmission lines; overhead transmission lines; line loadability power transmission; transmission lines; overhead transmission lines; line loadability

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Lauria, D.; Mottola, F.; Quaia, S. Analytical Description of Overhead Transmission Lines Loadability. Energies 2019, 12, 3119.

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