高电压技术2013，Vol.39Issue(3)：712-718,7.DOI:10.3969/j.issn.1003-6520.2013.03.030
高压单芯电缆铝护套下热阻的动态特性与实验研究
Dynamic Characteristic and Experimental Study on Thermal Resistance in Aluminum Sheath of High Voltage Single-core Cable
摘要
Abstract
To obtain the law of thermal resistance between aluminum sheath and conductor of cable (Ts-c) varying with temperature, we proposed and experimentally studied a model of Ts-c. Temperature distribution of cable layers in different steady states was obtained in step current temperature experiments on high-voltage single-core cable. Then, the thermal resistance of cable layers at different temperatures and their varying principles with temperature were deduced based on the definition of thermal resistance. The results show that Ts-c decreases with increasing temperature, at a rate that also decreases with increasing temperature, and tends to be steady at last. The thermal resistance of the insulation layer and Ts-c become to 0. 50 K·m/W and 0. 55 K ·m/W, respectively, which are 0.054 7 K·m/W and 0.077 1 K·m/W less than their calculated values according to Standard IEC 60287, respectively. The experimental value of thermal resistivity between aluminum sheath and conductor is 3. 070 K·m/W, 0. 43 K·m/W less than its standard value. The thermal resistance of air-gap layer is sum of air resistance and contact resistance, of which the order of magnitude is less than its standard value.关键词
高压单芯电缆/热阻模型/热阻率/材料热阻/接触热阻/动态特性Key words
high-voltage single-core cable/ thermal resistance model/ thermal resistivity/ material thermal resistance/ thermal contact resistance/ dynamic characteristic引用本文复制引用
刘刚,周凡,刘毅刚..高压单芯电缆铝护套下热阻的动态特性与实验研究[J].高电压技术,2013,39(3):712-718,7.基金项目
国家重点基础研究发展计划(973计划)(2009CB7-24507). （973计划）
