带并联电抗器的特高压输电线路故障性质识别  

An Approach to Identify Faults in UHVAC Transmission Line Equipped With Shunt Reactor

作　　者：程玲[1] 宋秭霖[2] 

机构地区：[1]四川宜宾电业局,四川省宜宾市644000 [2]国家电网公司宜宾特高压管理处,四川省宜宾市644000

出　　处：《电网技术》2010年第8期216-222,共7页Power System Technology

摘　　要：输电线路发生瞬时故障时,故障点处会产生变化过程复杂的电弧。为了分析电弧非线性特性对故障相母线电压高频暂态信号的影响,利用EMTP-ATP软件中的Models模块,建立了一、二次电弧模型;利用离散小波分析,提取故障相信号的高频成分,并计算固定时间窗内细节部分的谱能量值。瞬时故障与永久故障时,谱能量的变化趋势存在明显的差异,因此可以将连续时间窗内谱能量比值之和作为判断故障性质的判据。大量的电磁暂态仿真程序(electromagnetic transients program,EMTP)仿真及计算结果证明该判据可靠且有效的,适用于带并联电抗器的特高压输电线路。Transient fault occurred in transmission line will lead to electric arc that varies intricately. To analyze the influence of arc＇s nonlinear characteristics on high-fIequeney transient signal in busbar voltage of faulty phase, using Models module of EMTP-ATP software the models of primary and secondary arc are built. By means of discrete wavelet analysis the high-frequency component of fault signal is extracted and the spectrum energy of the details in fixed time window is calculated. Because the variation of spectrum energy of transient fault evidently differs from that of permanent fault, the sum of spectrum energy ratio in continuous time window can be taken as the criterion to judge the nature of fault. A lot of calculation results and simulation results by EMTP show that the proposed criterion is reliable and effective, and is applicable to UHVAC transmission line equipped with shunt reactor.

关 键 词：电弧特性 电磁暂态仿真程序 暂态分析控制系统 小波分析 瞬时性故障识别 

分 类 号：TM762.2[电气工程—电力系统及自动化]