摘要
近年来,随着城市改造建设的加速、随着电网网架结构的改善,城区110 kV电缆线路大量投入运行。110 kV电缆线路以其设计寿命长、受外界自然条件影响小、日常维护工作量相对较小、不影响城市景观等优点得到了肯定。但是,110 kV电缆线路为单芯电缆,必需考虑限制其护层感应电压,其接地方式若在设计、生产、安装、运行维护的任何一个环节出现问题,过电压均会导致电缆外护层击穿,从而形成环流、发生腐蚀,最终影响电缆线路的载流量及运行寿命。常见的110 kV电缆护层接地方式及护层保护的一些措施进行分析。
In recent years, along with accelerating of city construction and improvement of electric grid structure, 110 kV electric cable have been more and more used into urban electric grid system. 110KV electric cable has so many advantages ：long -term lifetime.minimal influence from natural environment、little daily work about examine and repair、no influence to city scenery. But,110 kV cable normally has single core cable type,if any mistake about cable earth system occurs during the course of cable design、producing、installation.examine and repairing, induced overvoltage will lead outer sheath breakdown、occur of the circuit current、corrosion,even at last reduce load capacity and shorten the cable lifetime. So the induced overvoltage must be controlled. This text analyses the normal way of inner metal sheath earthing and some measure of sheath damage preventing.
出处
《四川电力技术》
2008年第B08期91-94,共4页
Sichuan Electric Power Technology
关键词
110
kV电缆线路
护层保护
接地方式
110 kV electric cable
metal sheath protecting
era-thing method
