500kV同杆线路强耦合破坏性分析及改进方案  

Strong Coupling Destructive Analysis and Improvement Scheme for 500kV Parallel Transmission Lines

作　　者：季亮[1] 王灵贵[1] 李琪[1] 张海涛[1] 晁红军[1] 

机构地区：[1]国网河南省电力公司检修公司,洛阳471000

出　　处：《电力与能源》2015年第2期200-203,共4页Power & Energy

摘　　要：全线同杆双回线一侧并联电抗器运行方式在超高压线路中颇为常见。并联电抗器吸收电网容性无功的同时,也有可能与线路的感应电容配合形成谐振,在未并联电抗器线路带电运行,带有并联电抗器线路停运检修的状态下,线路相间耦合电容作用使得停运线路产生感应电压,此时如果线路高抗和线路参数匹配,符合谐振条件,那么就会在停运线路上产生很高的谐振过电压损坏电力设备。本文通过对初步感应电压电流、工频谐振以及潜供电流恢复电压的计算分析同杆双回线路强耦合所产生的高压极其破坏性,旨在避免500kV同杆双回高压线路强耦合谐振导致的事故发生。It＇s common that UHV parallel lines on the same tower have one shunt reactor,which can not only absorb the capacitive reactive power of the power grid, but also form resonance through coordinating with the induction capacitance of the transmission line. During the live running of the lines without shunt reactor, or the maintenance outage of the lines with shunt reactor, the inter-line coupling capacitance makes the outage line generate induced voltage. If the shunt reactor and the line parameter are matching, the high resonance over-voltage may damage electrical devices. This paper analyzes the destructiveness by strong coupling between two lines on the same tower by means of calculating initial induced voltage and current, power frequency resonance, and secondary arc current and recovery voltage of the double-circuit lines on the same tower, aiming to protect electrical devices from damage of strong coupling.

关 键 词：并联电抗器 强耦合 感应电压 

分 类 号：TM773[电气工程—电力系统及自动化]