高海拔地区500kV紧凑型线路过电压及防雷特性  

Over-voltage and Lightning Protection for 500 kV Compact Transmission Line in High Altitude Area

作　　者：赵建宁[1,2] 谷定燮[3] 霍锋[3] 曹晶[3] 戴敏[3] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]南方电网公司超高压局,广州510600 [3]国网电力科学研究院,武汉430074

出　　处：《高电压技术》2011年第1期57-61,共5页High Voltage Engineering

基　　金：国家电网公司500kV输电技术研究项目(NWG-FZ(2008)48)~~

摘　　要：通过分析比较多种海拔修正方法,结合工程实际,研究了"德宏-博尚"500kV高海拔紧凑型输变电工程空气间隙绝缘水平的海拔修正,并推荐了适合该工程的绝缘水平海拔修正方法。进行了德宏-博尚紧凑型线路绝缘水平选择和可靠性分析,并给出了德博线紧凑型线路的最小空气间隙,包括塔头处的相地最小空气间隙以及档距中央导线之间的最小空气间隙。研究表明,德宏站线路侧断路器在装合闸电阻的条件下,操作过电压下的全线绝缘闪络率可以控制在允许范围内;杆塔冲击接地电阻为10Ω时,德博全线雷击跳闸率为0.102次/(100km.a),低于全国500kV线路平均雷击跳闸率。In accordance with the project of 500 kV AC Dehong-Boshang compact transmission line,the correction method of insulation level was studied.By comparing many mainly used altitude or meteorology correction methods,the proper method was recommended.The least air gaps and phase spacing of the transmission line which was near the tower or in the span centrality of the compact transmission line were given.The results show that the lightning trip-out rate is 0.102time/（100 km · a） when the impulse grounding resistor is 10 Ω,which is lower than the average lightning trip-out rate.The insulation flashover rate under the switching voltage can be controlled in the admitted range by installing circuit breaker closing resistors.

关 键 词：高海拔 紧凑型输电线路 海拔修正 过电压 操作冲击 跳闸率 

分 类 号：TM862[电气工程—高电压与绝缘技术]