220kV城市电缆及混合线路过电压及绝缘配合研究  

Overvoltage and Insulation Coordination of 220kV Urban Cable and Hybrid Lines

作　　者：赵丹丹[1] 张嘉旻[1] 黄华[1] 马仁明[1] 

机构地区：[1]上海市电力公司电力科学研究院,上海200437

出　　处：《华东电力》2012年第2期270-274,共5页East China Electric Power

摘　　要：城市电网的发展要求对城市高压电缆线路的过电压进行深入研究。详细叙述了220 kV多种电缆排列方式以及混合线路的过电压的计算分析。研究结果表明:当电缆长度大于20 km时,开关重燃后的开关断口电压过大,需要加装高压电抗器予以限制,而50 km以内的线路合闸过电压均在规程规定范围内;架空线和电缆混合线路面临的最突出问题是工频过电压,当电缆长度占总长度约20%或者40%～60%时,需采取措施限制线路切空线重燃过电压。The development of urban power grid requires the in-depth research of the overvoltage of high-voltage cable lines in cities.This paper elaborates the various arrangement modes of cables,as well as the overvoltage calculation analysis methods for hybrid lines.And the research results indicate as follows： when the cable length is over 20km,the high-voltage reactor is needed to restrict the overvoltage in switch fractures after switch restriking;when the cable length is less than 50km,the line-closing overvoltage is within the prescribed limits;when cable length is about 20% or 40%~60% of the whole line,for power frequency overvoltage,the biggest problem of overhead line and hybrid line,it is necessary to restrict the overvoltage in the case of interrupted empty line restriking.

关 键 词：220KV电缆 排列方式 电缆长度 混合比例 绝缘配合 

分 类 号：TM864[电气工程—高电压与绝缘技术]