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为了研究工业输电线对瞬变电磁探测效果产生的影响,建立了工业输电线模型并结合均匀半空间模型,研究了瞬变电磁二次磁场的变化率和输电线在竖直方向上磁场变化率之间的定量关系,确定了发射框半径、信噪比与距工业输电线水平距离的关系.研究表明:工业输电线的干扰在地面上是呈正弦变化的,其幅值的大小与电流强度、输电线高度和距工业输电线的水平距离有关.并据此提出了消除工业输电线干扰的方法,研究结果对在工业输电线附近进行瞬变电磁工作具有指导意义.
In order to study the effect of industrial transmission lines on transient electromagnetic detection, an industrial transmission line model and a uniform half-space model are established to study the rate of change of transient electromagnetic secondary magnetic field and the rate of change of magnetic field in the vertical direction The relationship between the emission radius and the signal-to-noise ratio and the horizontal distance from the industrial power transmission line is determined.The results show that the interference of the industrial power transmission line changes sinusoidally on the ground, and the magnitude of the amplitude and the current intensity , The height of power transmission line is related to the horizontal distance from industrial power transmission line, and the method of eliminating the interference of industrial power transmission line is put forward accordingly. The research results are of guiding significance for the transient electromagnetic work near the industrial power transmission line.