750kV同塔同窗同相序双回紧凑型线路的潜供电流和感应电压  

Research on Secondary-Arc Currents and Induced Voltages for 750 kV Compact Double-Circuit Transmission Lines on the Same Tower With the Same Phase Sequence in the Same Tower Window

作　　者：王晓彤[1] 班连庚[1] 朱普轩[2] 郑彬[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]清华大学电机工程与应用电子技术系,北京市海淀区100084

出　　处：《电网技术》2011年第1期84-90,共7页Power System Technology

摘　　要：使用电磁暂态程序(electromagnetic transient program,EMTP),建立了750 kV同塔同窗同相序双回紧凑型线路模型。研究了全线或部分采用同塔同窗双回紧凑型线路时的潜供电流和恢复电压、感应电压和感应电流问题。结果表明,从限制潜供电流和恢复电压、感应电压和感应电流考虑,若线路装设高抗,则不宜在全线采用同塔同窗同相序线路。对此,可以考虑在线路主体采用常规型线路、仅在线路走廊紧张的路段采用同塔同窗同相序布置线路的方案。若同塔同窗同相序线路较短,则潜供电流和感应电压可限制在合理的水平内。对于无须装设高抗的短线路,若能解决开断感应电流问题,也可以考虑在全线采用同塔同窗同相序线路。A model of 750kV compact double-circuit transmission lines on the same tower with the same phase sequence in the same tower window is built by use of electromagnetic transient program （EMTP）. The problems of secondary-arc currents and recovery voltages, induced voltages and induced currents are studied when the structure of double-circuit compact transmission lines on the same tower with the same phase sequence in the same tower window are applied to full or partial length of the project. Research results show that in the viewpoint of suppressing secondary arc current, recovery voltage, induced voltage and induced current, it is not suitable to adopt such a line structure, i.e., double-circuit transmission lines on the same tower with the same phase sequence in the same tower window, to full length of the project while high voltage shunt reactors are configured. For this reason, following scheme that conventional type is used for the main part of this project and the structure of compact double-circuit transmission lines on the same tower with the same phase sequence in the same tower window is only applied in the sections where the land for line corridors is undersupplied. If the length of the section where the compact double-circuit transmission lines on the same tower with the same phase sequence in the same tower window is applied is short enough, the values of secondary arc current and induced voltages can be suppressed into a rational level. For short transmission lines where the high voltage shunt reactors are not to be configured, if the problem of switching-off induced currents can be solved, it is worthy of consideration to adopt the structure of compact double-circuit transmission lines on the same tower with the same phase sequence in the same tower window to the full lengths of transmission lines.

关 键 词：同塔同窗双回紧凑型线路 电磁暂态程序 潜供电流 感应电压 

分 类 号：TM751[电气工程—电力系统及自动化]