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.
邢雅, 李洪杰. 基于一种组合方法的地下电缆载流量的计算及恢复[J]. 电气技术, 2013, 14(10): 1-5.
Xing Ya, Li Hongjie. Calculation and Restoration of Underground Cable Ratings Based on a Combined Technique. Electrical Engineering, 2013, 14(10): 1-5.
2013, Vol. 14 
