Affiliations: [a] State Key Laboratory of Power Transmission Equipment and System Security and New Technology (Chongqing University), Chongqing 400044, China | [b] Chongqing Electric Power Design Institute Co. Ltd., Chongqing 401121, China
Correspondence:
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Corresponding author: Yaqin Tao, State Key Laboratory of Power Transmission Equipment and System Security and New Technology (Chongqing University), Shapingba District, Chongqing 400044, China. Tel./Fax: +86 15213562283; E-mail: [email protected].
Abstract: Eddy-current loss will cause waste of electric energy and affect service life of cable. In order to study the method of reducing eddy-current loss of cable trench in metal top pipe, a finite element simulation model was established. Firstly, influence factors of eddy-current loss were determined through a theoretical analysis, including arrangement mode of cable phase, top pipe size and cable distance. Finite element method was then used for optimal calculation of structure of cable trench and effective optimization design method was proposed. Results indicate that: for three-phase multiloop cable trench of metal top pipe, phase arrangement mode has important influence on eddy-current loss. For top pipe size, a comprehensive consideration of eddy-current loss and pipe stability should be taken in the thickness selection, and slotting position could only be at the position with maximum loss density. Both increase of distance between cable loop and top pipe and reduction of spacing between cables on the same loop will contribute to reduction of eddy-current loss of top pipe. Therefore, a cable trench structure commonly used in engineering was optimized and then its eddy-current loss was reduced by 70% effectively.
Keywords: Cable trench, eddy-current loss, finite element method, optimization design
