期刊论文

New Detection Methods for Fault Traveling Wave Signals of Power Grid Based on Space Magnetic Field

中文

电力系统及其自动化学报

1003-8930

2018

30

5

43-49

10.3969/j.issn.1003-8930.2018.05.008

国家自然科学基金资助项目（51577013） 湖南省自然科学***基金资助项目（2015JJ1001）

本校为第一机构

为避免变电站强电磁干扰对行波检测精度的影响,提出了一种空间磁场检测故障的新方法。根据输电线路附近的磁场能实时反映线路上电流变化的特征,利用自然边界元法分析三相输电线路的磁场情况,选择合适的位置设置检测点,并在检测点安装空间电磁传感器提取线路电流在空间产生的磁场信号,再采用固有时间尺度分解方法分析磁场信号提取故障行波。空间电磁传感器安装在变电站外,检测时能有效避免变电站内的强电磁干扰,可有效提高故障行波信号检测的可靠性与准确性,为故障行波定位与保护提供更有效的基础数据。

To avoid the influence of strong electromagnetic disturbance on the accuracy of traveling wave detection,a new method for space magnetic field detection is proposed.Based on the feature that the magnetic field signals near-transmission lines reflect current variations,natural boundary element method is firstly used to analyze the magnetic field profiles of three-phase transmission lines to choose a suitable position of check point,on which magnetic sensors will be installed.Then,the magnetic signals produced by the line current in the space are extracted.Finally,the magnet?ic signals are analy...