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    小波变换超高压输电线路雷电干扰识别判据研究

    2013-10-23 马 杰

    摘  要:超高压输电线路的继电保护装置不可避免地会受到各种高频信号的干扰,其中雷电干扰是最主要的干扰因素,可能会造成线路保护误动作。针对雷电干扰问题,对不同情况下的暂态电流模分量进行信号能量分布和波形分析,找出差异,提出区分输电线路上雷电干扰、故障性雷击及普通短路故障的判据,最终达到对雷电干扰的识别从而避免误动作。通过大量的Matlab仿真计算验证该方法的正确性、有效性。
    关键词:超高压输电线路;雷电干扰;频谱分析;小波变换
    中图分类号:TN911.7;TM723;P427.32+1;TN973.3      文献标志码:A     文章编号:1674-5124(2013)05-0034-05
    On the wavelet based identification of lightning interference for transmission lines
    MA Jie, LIU Lu-lu, YAO Yong
    (Kaifeng Administration of Electric Power Supply of Electric Power of Henan Kaifeng,
    Kaifeng 475004,China)
    Abstract: Protective relaying equipment play a significant role in transmission lines and suffers from varies of high frequency interference. Lightning interference is one of the major interference factors, which causes false operation during protection process. According to the lightning interference problem, this paper analyzes the energy distribution and wave of current transient components in different cases to find out the differences, and then proposes the criterion to distinguish the lightning interference, transmission induction lightning and short-cut fault for transmission lines. Finally, through the proposed method, lightning interference can be identified to eliminate false operation during protection process. Simulation results in Matlab verify the validity and effectiveness of our proposed method.
    Key words: transmission line; lightning interference; spectrum analysis; wavelet transform
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