输电线路故障辨识电磁暂态仿真研究

Electro-magnetic Transient Simulation on Fault Identification of Overhead Transmission Lines

目前国内利用直接监测技术实现输电线路不同故障原因辨识的研究尚处于起步阶段。为研究输电线路故障辨识方法,突破输电线路跳闸故障智能诊断关键技术,并为相关产品开发奠定基础,笔者建立典型输电线路仿真模型,采用ATP-EMTP电磁暂态仿真软件,对输电线路雷电绕击、反击和非雷击故障的暂态行波电流进行仿真。通过仿真结果对比和理论分析,提出输电线路雷击与非雷击、绕击与反击故障的判据,即利用波尾时间长短、有无反极性脉冲等暂态行波电流特征差异进行故障辨识的方法。笔者提出的辨识方法可作为输电线路跳闸故障智能诊断的理论基础,在此基础上可实现智能诊断监测终端开发,建立输电线路跳闸故障智能诊断专家系统。

To get a fault identification method for overhead transmission basis for development of corresponding fault identification systems, lines and to provide a theoretical a simulation model of overhead transmission line is built. And the transient travelling wave currents due to lightning shielding failure, back strike and non-lightning strike are simulated by using the electromagnetic transient simulation software ATP-EMTP. By comparison of simulation results and theoretical analysis, identification criteria of the failures due to lightning strike, non-lightning strike, shielding failure and back strike are obtained for fault identification in terms of the differences in transient travelling wave current characters such as length of wave tail, with or without inverted pulse, etc. The proposed fault identification method can be taken as a theoretical foundation for intelligent diagnosis of transmission line tripping fault, on which monitoring terminal of intelligent diagnosis can be developed, and expert system of intelligent diagnosis for transmission line tripping fault can be further established.