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| Calculation and Restoration of Underground Cable Ratings Based on a Combined Technique |
| Xing Ya, Li Hongjie |
| School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049 |
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Abstract Based on the temperature profile of advanced distributed temperature sensing(DTS) system, all hotspots of an underground cable circuit can be readily identified and located. In this paper, a technique is developed to real-time assess underground cable ratings using cable construction and installation data, load current and estimated soil thermal parameters of the most serious hotspot, which is accomplished through the use of the finite-element method(FEM) and a gradient-based optimization method. The technique is applied to a 230kV/500MVA cable circuit to show its effectiveness and accurateness in assessment of continuous and emergency ratings. In order to restore the full cable rating, a method is presented to mitigate the hotspot by means of removing top earth filling of a hotspot. The proposed improvement method is proved very useful through a three-dimension finite-element simulation.
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Published: 10 October 2013
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| Cite this article: |
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Xing Ya,Li Hongjie. Calculation and Restoration of Underground Cable Ratings Based on a Combined Technique[J]. Electrical Engineering, 2013, 14(10): 1-5.
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| URL: |
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http://dqjs.cesmedia.cn/EN/Y2013/V14/I10/1
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2013, Vol. 14 
