Open AccessThermal analysis of high‐voltage cables with several types of insulation for different configurations in the presence of harmonics
Author(s) -
Shazly Jehan H.,
Mostafa Mohamed A.,
Ibrahim Doaa K.,
Abo El Zahab Essam E.
Publication year - 2017
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2016.0862
Subject(s) - derating , harmonics , multiphysics , harmonic , voltage , mechanics , thermal , materials science , acoustics , electrical engineering , finite element method , engineering , structural engineering , physics , meteorology
In this contribution, the three‐phase underground cable is modelled using COMSOL Multiphysics software to evaluate the steady state and transient thermal performances. Finite element technique is applied using the heat conduction equation to study the temperature distributions in power cables components and the surrounding environment for both linear and non‐linear loads. A real case study of 220 kV, 340 MVA three‐phase single core copper cables insulated by XLPE is studied. Other types of insulation such as oil, and SF6 gas and their contributions of convection and radiation are investigated at trefoil and flat configurations. The loading capability under different ambient conditions for average moisture soil and dry soil with low‐moisture content are also evaluated taking into account the unfavourable effect of dry zones formation. Moreover, the challenge of predicting the accurate thermal performance and estimating the required derating factor in the presence of odd harmonics is considered. The effect of the change of the frequency spectrum of the non‐linear load current by involving different simultaneous harmonic orders for the same total harmonic distortion is extensively investigated for both flat and trefoil configurations. It is concluded that all harmonics contributions should be considered, to accurately calculate the required cable derating.