基于反演的电力电缆缆芯温度间接测量研究

Research on Indirect Measurement Method of Cable Conductor Temperature Through Temperature Retrieval

针对电力电缆导体温度的测量,提出了一种基于有限元法的电缆导体温度间接测量方法.利用有限元法对电缆温度场进行分析计算,获取不同载荷、边界条件下的表面温度和导体温度的对应关系,再结合测量到的表面温度即可间接得到导体温度.另外,针对电缆中某些材料热参数难以标定从而影响温度场计算模型准确性的问题,本文通过对电缆内部材料的热参数值进行辨识以对模型进行校正.

To realize monitoring for the conductor temperature of power cables, an indirect measurement method based on finite element method is introduced. By calculating the cable temperature field based on finite elements, the corresponding relationship between surface temperature and conductor temperature under dif- ferent load and boundary conditions is got. Besides, aiming at the problem that the thermal parameters of some materials are difficult to be calibrated so as to influence the accuracy of the temperature field calculation model, the unknown thermal parameters are identified in this paper.