Uncertainties in the Testing of the Coefficient of Thermal Expansion of Overhead Conductors

Miren T. Bedialauneta, Igor Albizu, Elvira Fernandez and A. Javier Mazon
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Miren T. Bedialauneta: Department of Electrical Engineering, School of Engineering Bilbao, University of the Basque Country UPV/EHU, Plaza Ingeniero Torres Quevedo, 1, 48013-Bilbao, Spain
Igor Albizu: Department of Electrical Engineering, School of Engineering Gipuzkoa, University of the Basque Country UPV/EHU, Otaola Etorbidea, 29, 20600-Eibar, Spain
Elvira Fernandez: Department of Electrical Engineering, School of Engineering Bilbao, University of the Basque Country UPV/EHU, Plaza Ingeniero Torres Quevedo, 1, 48013-Bilbao, Spain
A. Javier Mazon: Department of Electrical Engineering, School of Engineering Bilbao, University of the Basque Country UPV/EHU, Plaza Ingeniero Torres Quevedo, 1, 48013-Bilbao, Spain

Energies, 2020, vol. 13, issue 2, 1-13

Abstract: Overhead lines can be replaced by high temperature low sag (HTLS) conductors in order to increase their capacity. The coefficients of thermal expansion (CTE) of the HTLS conductors are lower than the CTE of conventional conductors. The utilities and conductor manufacturers usually carry out the verification of the CTE of the overhead conductors in an actual size span. The verification is based on the observation of the change of the conductor length as a result of the conductor temperature change. This process is influenced by the coefficient of thermal expansion to be verified. However, there are other factors that also affect it. This paper analyzes the effect of some of the uncertainty sources in the testing of the coefficient of thermal expansion of the overhead conductors. Firstly, the thermal expansion process is described and the uncertainty sources related to the conductor and the line section are identified. Then, the uncertainty sources and their effect on the CTE testing are quantified.

Keywords: high temperature low sag conductor; coefficient of thermal expansion; overhead conductor; low sag performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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