EHV输电线路上潜供电弧的分布参数计算模型探讨  

Discussion on the Distributed Parameter Model of the Potential Arc in EHV Transmission Lines

作　　者：陈球武[1] 慕娇娇[1] 肖遥[1] 陈凯[1] 张进龙[1] 

机构地区：[1]广西大学电气工程学院,广西南宁530004

出　　处：《电气开关》2014年第6期33-38,共6页Electric Switchgear

摘　　要：330k V及以上电压等级的EHV输电线路发生单相接地故障时,故障相断路器跳开后,故障点处的弧光不能自灭,数十安的自由电弧电流让断路器重合闸无法顺利完成,严重影响了供电的可靠性和安全性。EHV输电线路的输送距离较远,潜供电弧的两个重要参数:潜供电流和恢复电压[1],在故障相线路上都具有一定的分布特性,所以应用分布参数计算模型对自由电弧进行探讨。先从较为简便的线路单元的等值电路出发,推导出潜供电流和恢复电压的数学模型。然后,探讨并建立了带有并联电抗器和串联补偿站的超高压输电线路的潜供电流和恢复电压的数学模型。最后分析所建立的分布式数学模型的物理意义。When the single phase ground fauhoccurred on EHV transmission lines of 330 kV and above the voltage lev- el, the breaker of fault phase switch off, arc of fault point cantcrush out by itself. Dozens of free arc current circuit break- er reclosing cant complete,which seriously affected the reliability and security of the power supply. Distance transporta- tion of EHV transmission lines is long enough. The potential arc of two important parameters：the secondary arc current and recovery voltage, which have distribution characteristics on the transmission lines of fault phase. Therefore, the paper applies distribution parameter calculation modelfor free arc discussed. This articleanalyzestheequivalent circuit ofthe sim- ple circuit uniffirstly, to deduce the mathematical model of the secondary arc current and recovery voltage. Then, dis- cussed and established the mathematical model of the secondary arc current and recovery voltage onEHV transmission lines, which with shunt reactor and series compensation station. Finally, analyzed the physical meaning of the distributed mathematical model to be estabished.

关 键 词：超高压输电 潜供电流 恢复电压 分布参数 

分 类 号：TM72[电气工程—电力系统及自动化]