摘要
近年来,国内110 kV及以上电压等级电缆发生多起缓冲层烧蚀故障。采用有限元法建立了高压电缆轴向仿真模型并开展了电-热耦合仿真,研究了波纹铝护套在正常状态以及与缓冲层之间存在气隙时的温度场分布,得到以下仿真结果:当波纹铝护套与缓冲层间存在气隙时,不利于电缆本体的散热,将导致载流量下降;气隙放电会加剧阻水缓冲层烧蚀,气隙放电时的热源中心温升可达470 K,但在未造成缓冲层阻水粉析出时,短时气隙放电对电缆本体的宏观温度分布影响较小。
In recent years,multiple buffer layer ablation failures occurred in domestic cables with voltage levels of 110 kV and above.In this paper,the finite element method is used to establish an axial simulation model of HV cable,and the electro-thermal coupling simulation is carried out to study the distribution of temperature field of corrugated aluminum sheath operating in a normal situation and in the case of air gaps between buffer layers.The simulation results show that when there is an air gap between the corrugated aluminum sheath and the buffer layer,it is disadvantageous for heat dissipation,and thus ampacity decrease of cables;air-gap discharge aggravates the erosion of the buffer layer,and the temperature rise in the center of heat source can reach up to 470 K,but the macroscopic effect of short-time air gap discharge on the cable temperature distribution can be ignored before the water-blocking powder is separated out.
作者
刘黎
周路遥
李晋贤
王少华
杨帆
尚瑞琦
LIU Li;Zhou Luyao;LI Jinxian;WANG Shaohua;YANG Fan;SHANG Ruiqi(State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China)
出处
《浙江电力》
2021年第11期54-59,共6页
Zhejiang Electric Power
基金
国网浙江省电力有限公司科技项目(5211DS18002W)。
关键词
波纹铝护套
缓冲层
电-热耦合场
气隙放电
corrugated aluminum sheath
buffer layer
electro-thermal coupling field
air-gap discharge
