Frequency Dependent Losses in Transmission Cable Conductors

Rasmus Schmidt Olsen, Joachim Holbøll, Unnur Stella Guðmundsdóttir

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearch

Abstract

Denmark is taking on the exciting project of undergrounding the electricity transmission grid. In 2009 it was decided by the Danish government to underground large parts of the 400 kV and the entire 132-150 kV transmission network before the end of 2030. For ensuring network stability and economical gain, such severe network changes necessitate correct estimation and optimisation of load conditions in the cable grid. Both IEC and IEEE have published standards for rating transmission cables' current carrying capacity. These standards are based on assumptions of a number of parameters, such as thermal conditions in and around the cable, as well as the heat generated in conductors, screens, armours etc., taking into account proximity and skin effects. The work performed and presented in this paper is concerned with an improved determination of the losses generated in the conductor, by means of better calculation of the AC resistance of transmission cable conductors, in particular regarding higher frequencies. In this way, also losses under harmonics can be covered. Furthermore, the model is suitable for modelling of transient attenuation in high voltage cables. The AC resistance is calculated based on the current density distribution in different conductor designs by means of the Finite Element Method (FEM). The obtained results and methods are compared to available standards (IEC publication 60287-1-1).
Original languageEnglish
Title of host publicationProceedings of the 22nd Nordic Insulation Symposium
Number of pages202
PublisherTampere University of Technology
Publication date2011
Pages93-98
ISBN (Print)978-952-15-2562-9
Publication statusPublished - 2011
Event22nd Nordic Insulation Symposium - Tampere, Finland
Duration: 1 Jan 2011 → …
Conference number: 22

Conference

Conference22nd Nordic Insulation Symposium
Number22
CountryFinland
CityTampere
Period01/01/2011 → …

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