Abstract
This article proposes using a metallic plate to be installed above the underground power cable route to mitigate the maximum cable conductor temperature and the ground surface magnetic flux density surrounding the cable route and underground cable derating factor. The article presents a case study containing a single-circuit 145 kV, three-phase individual cables in flat formation. The impacts of the mitigation plate dimensions such as plate width, thickness, the distance between the underground cables and the plate used in the mitigation, and the plate material are investigated. Three kinds of materials are examined in this article, namely aluminum, steel 100, and steel 500. Moreover, the optimal design dimensions of the metallic plate for the case under study were estimated. It is concluded that the shielding factors of the magnetic flux density and cable core temperature with aluminum are greater than steel 100 and steel 500. In addition, the derating factor, which is the ratio of the current capacity of the underground cable with shielding plate and that without shielding plate at the same cable core temperature, is increased to be 1.28 with the use of shielding Aluminum plate, rather than 1.18 and 1.17 in case of using Steel 500 and Steel 100 shielding plates, respectively. Finally, the proposed algorithm was validated by comparing its results with the experimental measurements obtained by the others, indicating good agreements.
Highlights
Due to the increase in electrical energy demand within urban centers, high voltage underground power cable systems are becoming more used
The simulation using the suggested electromagneticthermal technique of underground power cables provides an effective tool to recognize the impact of mitigation plates on the power cables' magnetic flux density and their cores temperatures
The comparison between of the magnetic flux density in experimental measurements done by [10] and simulated results carried out by the use of the article algorithm are given in Fig.13 when the cable is loaded by 840 A and 630 A, respectively
Summary
Due to the increase in electrical energy demand within urban centers, high voltage underground power cable systems are becoming more used. Results for the magnetic field reduction factor at the soil surface were obtained for different shielding materials, different shielding thickness values, and different frequency values The installation of such shielding metallic plates near the underground cables affects the thermal performance of the cables. 4) The electrical conductivity of the cable surrounding soil is ignored In this situation, the finite element method is used to simulate the case under study and investigate the impacts of mitigation plate dimensions on the magnetic flux density, temperature shielding factors, and underground cable derating factors. For improving the computation competence of the proposed model, the conductivity of the cable core conductor and its metallic sheath variations with temperature change are considered using the following IEC equation [24]:.
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