电力系统运行中电缆缺陷对温度变化的影响研究

Influence of Cable Defects on Temperature Variation in Power System Operation

针对电力系统电缆接头缺陷导致电缆温度变化的不同,开展电力电缆缺陷对温度的影响研究。利用ANSYS软件建立仿真模型,划分网格并设置边界条件,开展仿真分析。研究了不同缺陷类型中心温度变化和复合界面温度变化,并对不同缺陷尺寸对温度的影响进行研究。结果表明:不同的缺陷类型导致温度变化不同,在电缆接头中心径向方向,金属颗粒缺陷温度变化最大,水珠缺陷温度变化最小;在电缆复合界面上,金属缺陷使得温度下降,水珠缺陷使得温度升高;不同缺陷尺寸温度变化也不同,缺陷半径5 mm和10 mm金属颗粒缺陷外表面温度最高,气隙缺陷类型的外表面温度最低,半导电、水珠缺陷温度变化与正常电缆温度曲线基本重合,变化微小。

Aiming at the difference of cable temperature caused by cable joint defects in power system,the influence of cable defects on temperature is studied.The simulation model is built by ANSYS software,the grid is divided and the boundary condition is set,and the simulation analysis is carried out.The variation of central temperature and composite interface temperature of different defect types were studied,and the influence of different defect sizes on temperature was also studied.The results show that different types of defects lead to different temperature variations.In the radial direction of cable joint,the temperature variation of metal particle defects is the largest,and that of water droplet defects is the smallest,the surface temperature of the defects with radius of 5mm and 10mm is the highest,and the surface temperature of the defects with radius of 5mm and 10mm is the highest,the air gap defect type has the lowest outer surface temperature,and the temperature variation of semi-conductive and water droplet defect basically coincides with the temperature curve of normal cable,and the variation is small.