大截面电力电缆固定金具三维涡流场有限元分析

文中建立了大截面电缆固定金具的三维涡流场数学模型,考虑初始条件和边界条件,利用有限元法分别研究了缆芯电流、金具材料电导率以及金具厚度对金具涡流损耗的影响。计算结果表明,金具涡流损耗均随电流、电导率以及厚度的增加而增大。当电流较大时,金具涡流损耗变化较快;当电导率较大时,反而金具涡流损耗变化趋于平缓;金具涡流损耗随厚度的变化呈线性关系。文中提出选用不锈钢作为金具材料可以有效地降低金具中所产生的涡流损耗。

Analysis of 3D Eddy Current Field of Fixed Cleat forLarge Cross-Section Power Cable Based on FEM

A 3D eddy current mathematical model of fixed clamp for large cross-section power cable is proposed in this paper. The effect of the current of cable core, the conductivity of fixed clamp material and the thickness of fixed clamp on the eddy current losses of fixed clamp is studied adopting FEM under the consideration of initial and boundary conditions. The calculation results show that the eddy current losses of cable cleat are increased with the increase of current, conductivity and thickness. When the current is large, the eddy current loss of fixed clamp changes rapidly. When the conductivity is large, however the eddy current losses of fixed clamp change to flatten. And, the change of the eddy current losses of fixed clamp with the thickness is approximately linear relationship. This paper also put forward to choose stainless steel as the power cable cleat material can effectively reduce the eddy current losses produced by cable cleat.