摘要
特高压同塔双回输电线路因其相间和回间距离小而存在较大的感应电压、电流,会直接影响线路检修、运行和接地开关设备的选型。为此,以浙北—上海特高压同塔双回输电线路为例,建立了特高压下同塔双回输电线路模型,计算了同向全换位和逆向全换位在不同负荷电流下的感应电压、电流。当负荷电流为3500A时,逆向全换位的最大静电感应电压为25.36kV,静电感应电流为5.73A,电磁感应电压为1.33kV,电磁感应电流为41.79A。计算结果表明:增加回间距离及采用逆向全换位可以在一定程度上减小感应电压、电流幅值。当停运线路两端接地时,线路中部仍有0.77kV的感应电压,运行线路断路器分闸操作也会在停运线路上产生感应65.96kV的暂态过电压,在进行线路检修、运行及设备选型时需引起注意。
The very short distance between phases and high induced voltage and current UHV double circuit transmission lines on the same tower will affect the line maintenance,operation and selection of earthing switch equipment and so on.Taking the UHV double circuit transmission lines on the same tower from the North of Zhejiang to the west of Shanghai as an example,we obtained the induced voltage and current under different load currents respectively by the calculation and analysis in the case of the complete transposing span manners with the same and reverse phase.When the load current reached 3500A in the case of the complete transposing span manners with reverse-phase,the maximum of electrostatic induced voltage would be 25.36 kV,the electrostatic induced current would be 5.73A,the electromagnetic induced voltage would be 1.33 kV,and the electromagnetic induced current would be 41.79 A.The result shows that increasing the distance between lines can reduce the induced current and voltage amplitude to a certain extent in the case of the complete transposing span manners with reverse-phase.While non-energized lines were on two-terminal-grounding,there was still induced voltage at 0.77 kV on the lines,and the circuit breaker opening could get transient overvoltage at 65.96 kV on the non-energized lines.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第9期2193-2198,共6页
High Voltage Engineering
基金
教育部高等学校博士学科点专项科研基金(20092102110001)
教育部高等学校科技创新工程重大项目培育资金项目(707018)
辽宁省教育厅优秀人才项目(2006R40)
辽宁省教育厅科学技术研究项目(2008T134)~~
关键词
特高压
同塔双回输电线
静电感应电压
静电感应电流
电磁感应电压
电磁感应电流
接地开关
仿真分析
ultra-high voltage（UHV）
double circuit transmission lines on the same tower
electrostatically induced voltage
electrostatically induced current
electromagnetically induced voltage
electromagnetically induced current
earthing switch
simulation analysis
