基于导数法的变电站接地网方向检测

Direction Detection of Substation Grounding Grid Based on Derivative Method

为了测量接地网的拓扑结构,必须对接地网方向进行准确的检测。为此提出了一种用于高压变电站接地网方向检测的导数方法。当电流通过垂直导线注入电网时,磁通密度的分布垂直于地球表面。通过对垂直导线定心圆进行三阶求导,增加曲线的切线斜率来减小峰宽,克服了峰宽较大造成的假峰现象,精确地得到了与接地导线方向相吻合的主峰,从而运用接地支路方向相对应的峰值完成方向检测。利用Comsol Multiphysics 5.0进行仿真,结果表明,该方法计算接地网方向精度高,并且峰宽与圆半径成反比关系,增大圆半径可以进一步精确接地网方向的检测。

In order to measure the topological structure of the grounding grid,it is necessary to accurately detect the direction of the grounding grid.This paper presents a derivative method for detecting the direction of grounding grids in high-voltage substations.When current is injected into the grid through vertical wires,the distribution of magnetic flux density is perpendicular to the earth's surface.Through the third-order derivation of the centering circle of the vertical conductor,the tangent slope of the curve is increased to reduce the peak width,which overcomes the false peak phenomenon caused by the large peak width,and accurately obtains the main peak that matches the direction of the grounding conductor.The peak value corresponding to the direction of the grounding branch is used to complete the direction detection.Simulation uses Comsol Multiphysics 5.0,the result shows that the method has high accuracy in calculating the direction of the grounding grid,and the peak width is inversely proportional to the radius of the circle.Increasing the radius of the circle can further accurately detect the direction of the grounding grid.