高电压技术2018，Vol.44Issue(8)：2704-2709,6.DOI:10.13336/j.1003-6520.hve.20180731029
三芯电缆不平衡电流对温度分布的影响
Influence of Unbalanced Current in 3-core Power Cable on Temperature Distribution
摘要
Abstract
When 3-core distribution power cable is in service, unbalanced current in 3-phase usually occurs due to the different demands of consumers load in different phases. As a result, it is necessary to determine the cable temperature rise under unbalanced current. Only balanced conditions of 3-phase current are considered in IEC 60287 and the thermal circuit method is too difficult to calculate temperature rise. Therefore, we applied a finite element method to build a numerical model for cables' thermal field. Using the cable thermal field model, we set different unbalanced degrees in phase-A and calculated the greatest load current of phases-B and phases-C by dichotomy. According to the results, if the further unbalanced degree deviates from 0 value, the total current of cable transmitting under 90 ℃ is less. Besides, the total loss of cable is smallest when the unbalanced degree is 0.6. Distribution administrator can make use of different unbalanced degrees to decrease the line loss rate and increase the cable utilization ratio.关键词
三芯电缆/有限元法/不平衡电流/载流量/温度分布Key words
3-core power cable/finite element method/unbalanced current/ampacity/temperature distribution引用本文复制引用
阮羚,赵艾萱,邓丹,杨波,杨帆,邓军波,张冠军..三芯电缆不平衡电流对温度分布的影响[J].高电压技术,2018,44(8):2704-2709,6.基金项目
国网湖北省电力公司科技项目(52153214001K) （52153214001K）
国家自然科学基金(51577150) （51577150）
国家自然科学基金创新研究群体科学基金(51521065).Project supported by Science and Technology Project of State Grid Hubei Electric Power Company(52153214001K), National Natural Science Foundation of China(51577150), Foundation for Innovative Research Groups of National Natural Science Foundation of China(51521065). （51521065）
