回填低热阻材料对排管敷设电缆载流量的提升研究  

Study on Improving Ampacity of Cables Laid in Pipes by Backfilling Low Thermal Resistance Materials

作　　者：李红发 程绍兵 王金城 董志聪 王荣鹏 刘秉军 曾含 刘刚[3] LI Hongfa;CHENG Shaobing;WANG Jincheng;DONG Zhicong;WANG Rongpeng;LIU Bingjun;ZENG Han;LIU Gang(Zhongshan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Zhongshan 528400,China;Training and Evaluation Center of Guangdong Power Grid Co.,Ltd.,Guangzhou 510000,China;School of Electric Power,South China University of Technology,Guangzhou 510000,China)

机构地区：[1]广东电网有限责任公司中山供电局,广东中山528400 [2]广东电网有限责任公司培训与评价中心,广东广州510000 [3]华南理工大学电力学院,广东广州510000

出　　处：《绝缘材料》2022年第3期84-92,共9页Insulating Materials

基　　金：中国南方电网有限责任公司科技项目(CDKJXM20172813)。

摘　　要：针对排管敷设电缆散热效果差而导致电缆线路载流量瓶颈的问题,以2×3排管敷设2回路110 kV电力电缆为研究对象,通过热路模型和大电流试验分析了管内回填低热阻材料前后电缆载流量的变化情况,并基于有限元仿真模型分析了电缆载流量与回填材料导热系数的关系。结果表明:2×3排管敷设2回路110 kV630 mm^(2)电缆时,相比于管内无回填的情况,管内回填低热阻材料后电缆载流量可提升25.22%。随着回填材料导热系数的增大,电缆的载流量不断增加,但增加的速度越来越缓慢,电缆载流量最终趋于稳定。当回填材料的导热系数由1 W/(m·K)增至7 W/(m·K)时,电缆载流量的提升率为8.99%;当回填材料的导热系数由7 W/(m·K)增至13 W/(m·K)时,电缆载流量的提升率仅为2.00%。Aiming at the problem that the poor heat dissipation effect of the cable laying in piping leads to the cable line appear ampacity bottleneck,we use the 2×3 piping laying of 110 kV power cable with two loops as research object.The changes of cable ampacity before and after backfilling low thermal resistance materials in the pipes was studied through thermal circuit models and large current tests,and the relationship between the ampacity of cable and the thermal conductivity of backfill material was analyzed based on finite element simulation model.The results show that when two circuits of 110 kV 630 mm^(2) cables are laid with 2×3 rows of pipes,compared with the case without backfilling in the pipes,the ampacity of cables after the pipes are backfilled with low thermal resistance materials increases by 25.22%.With the continuous increase of thermal conductivity of the backfill material,the ampacity of cable also continues to increase,but the increase rate is slower and slower,and the ampacity of cable tend to be stable eventually.When the thermal conductivity of backfill material increases from1 W/(m·K)to 7 W/(m·K),the increase rate of cable ampacity is 8.99%.When the thermal conductivity of backfill material increases from 7 W/(m·K)to 13 W/(m·K),the increase rate of cable ampacity is only 2.00%.

关 键 词：排管敷设 低热阻材料 大电流试验 有限元仿真 载流量 

分 类 号：TM726[电气工程—电力系统及自动化]