电缆穿墙金属套管发热影响因素及抑制方法研究  

Influencing Factors and Suppression Methods Study on Heat Generation from Steel Pipes of Cables through Walls

作　　者：田淑均 王恩德 罗印 熊一蓉 詹花茂[2] TIAN Shu-jun;WANG En-de;LUO Yin;XIONG Yi-rong;ZHAN Hua-mao(Beijing Electric Power Economical and Technology Research Institute Co.,Ltd.,Beijing 100055,China;North China Electric Power University,Beijing 102206,China)

机构地区：[1]北京电力经济技术研究院有限公司,北京100055 [2]华北电力大学电气与电子工程学院,北京102206

出　　处：《变压器》2022年第3期23-30,共8页Transformer

摘　　要：电缆进入变电站夹层穿墙时,多采用外套金属套管。由于交变磁场的作用,套管中将感应出涡流,导致套管发热,由此产生的热量会传导至电缆外护层及绝缘层,加速电缆外护层及绝缘层的老化,甚至引起电缆故障。本文分析了套管中涡流损耗的产生原理,利用COMSOL仿真分析了不同工况下电缆及其套管的温度分布和影响因素。研究结果揭示了套管材料磁导率、载流量、套管材料电导率等因素对涡流损耗的影响规律。在套管上开缝可降低套管的等效磁导率,从而减小涡流损耗及温升。仿真研究了开缝大小与温升的关系,获得了最优的开缝宽度。通过实验测温结果与仿真结果对比,验证了模型的正确性。When the cable enters the substation interlayer through the wall, the outer metal pipe is often used. Due to the action of the alternating magnetic field, eddy current is induced in the steel pipe, which causes the steel pipe to generate heat, and the heat generated thereby is transmitted to the outer sheath and the insulating layer of the cable, thereby accelerating the aging of the outer sheath and the insulating layer of the cable. It even caused a cable failure. In this paper, the principle of eddy current loss in steel pipe is analyzed. The temperature distribution and influencing factors of cable and its steel pipe under different working conditions are analyzed by COMSOL simulation.The research results reveal the influence of the pipe material permeability, current amplitude, pipe material conductivity on the eddy current loss. Slotting on the steel pipe reduces the equivalent permeability of the steel pipe, thereby reducing eddy current losses and temperature rise. The relationship between the size of the slit and the temperature rise was studied by simulation, and the optimal slit width was obtained. And by the comparison of experimental temperature measurement results and simulation results, the correctness of the model is verified.

关 键 词：穿墙套管发热 涡流损耗 开缝 磁导率 

分 类 号：TM401.2[电气工程—电器]