Enhancing the Ampacity of a 400 KV Overhead Transmission Line Under Real Weather Conditions: A Case Study Using the CIGRE 601 Methodology

František Margita; L’ubomír Beňa; Paweł Pijarski; Sylwester Adamek; Krzysztof Baran; Ardian Hyseni; Kristián Glajc

doi:10.2478/aei-2026-0006

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Enhancing the Ampacity of a 400 KV Overhead Transmission Line Under Real Weather Conditions: A Case Study Using the CIGRE 601 Methodology

Acta Electrotechnica et Informatica

Volume 26 (2026): Issue 2 (June 2026)

By: František Margita, L’ubomír Beňa, Paweł Pijarski, Sylwester Adamek, Krzysztof Baran, Ardian Hyseni and Kristián Glajc

Open Access

|Jun 2026

Abstract

A steady-state dynamic line rating (DLR) assessment was conducted for a 400 kV overhead transmission line in Slovakia using the standardized CIGRE Technical Brochure 601 methodology. The study was performed on the V427 corridor equipped with aluminium conductor steel-reinforced (ACSR) 243-AL1/39-ST1A conductors to evaluate the ampacity potential under realistic environmental conditions. Hourly meteorological data for the year 2024 were obtained from the Open Meteo API and included ambient temperature, wind speed and direction, and global tilted irradiance. The ampacity model accounted for Joule heating, solar gain, convective and radiative cooling, and the current limits were derived from the thermal equilibrium condition. The results showed that the average DLR exceeded the conventional static line rating (SLR) by 69.3 %, with exceedance observed during 99.4 % of the evaluated hours. The influence of weather parameters, particularly wind speed and angle of attack, on conductor performance was also quantified. These findings confirmed the feasibility of implementing DLR to enhance grid utilization, especially under conservative operating assumptions.

References

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Articles in this issue

DOI: https://doi.org/10.2478/aei-2026-0006 | Journal eISSN: 1338-3957 | Journal ISSN: 1335-8243

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Language: English

Page range: 13 - 20

Submitted on: Sep 21, 2025

Accepted on: Nov 21, 2025

Published on: Jun 17, 2026

Published by: Technical University of Košice

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

Dynamic Line Rating,

Ampacity,

Overhead Transmission Line,

CIGRE 601,

ACSR Conductor,

Weather-based Modeling

Related subjects:

Computer sciences,

Information technology,

Databases and data mining,

Engineering,

Electrical engineering,

Information technology

© 2026 František Margita, L’ubomír Beňa, Paweł Pijarski, Sylwester Adamek, Krzysztof Baran, Ardian Hyseni, Kristián Glajc, published by Technical University of Košice
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 26 (2026): Issue 2 (June 2026)