摘要
高压电缆接头加载电流达到稳态时,电缆接头及附近本体导体沿轴向存在温度分布梯度,载荷能力和玻璃钢保护壳的引入对此温度分布存在影响。为研究载荷能力和玻璃钢保护壳的引入对电缆接头轴向传热过程的影响,建立了电缆接头的简化热路模型,分析了接头内部的热传递特点,并搭建了高压电缆接头温升实验平台,分别完成了引入玻璃钢保护壳前后电缆接头不同载荷水平下的稳态温升试验。实验结果表明,玻璃钢保护壳的引入降低了电缆接头主体内导体温度沿轴向的下降速度;当电缆接头运行在更高的负荷下时,电缆接头整体温度和轴向温差均增大,接头主体部分的导体温度变化率也随之增大,且附近本体导体温度沿轴向波动更加明显。玻璃钢保护壳的引入和载荷水平的提高均增大了接头轴向传热对电缆本体导体沿轴向的温度分布的影响程度和影响范围。
When the high voltage cable joint loads current to reach steady state, there is a temperature gradient distri-bution in the axial direction between cable joint conductor and cable body conductor. Load capacity and the introduc-tion of FRP protective shell both affect the temperature distribution. To study how load capacity and FRP protective shell affect the axial heat transfer process of the cable joint, this paper builds the simplified thermal circuit model of cable joint and analyzes the heat transfer characteristics of cable joint. Then the steady state temperature rise experi-ment platform is built and respectively complete the steady state temperature rise experiment before and after the intro-duction of FRP protective shell under different load levels. Experimental results show that the introduction of the FRP protective shell reduces the axial conductor temperature lowering speed of cable joint. When the cable joint runs at a higher load, overall temperature and axial temperature difference of cable joint are both increased. The conductor temperature change rate of the joint,s main body portion is also increased, and conductor temperature of cable body nearby fluctuates more obviously in the axial direction. The introduction of FRP protective shell and raise of load level both increase the impact extent and scope of cable joint axial heat transfer effect on cable body conductor temperature distribution in the axial direction.
出处
《电线电缆》
2017年第1期5-10,共6页
Wire & Cable
基金
国家高技术研究发展计划(863计划)项目:基于大数据的城市电网状态评估系统开发与应用(2015AA050201)
关键词
高压电缆接头
轴向传热
稳态温升实验
玻璃钢保护壳
载荷能力
HV cable joint
axial heat transfer
the steady state temperature rise experiment
FRP protective shell
load capacity
