应用于变电站接地网的空间磁场检测装置

Space magnetic field detecting device applied to substation grounding grid

变电站接地网发生短路故障时,导体上的电流以及土壤中的泄漏电流会产生较强的空间磁场,可能影响站内设备的正常工作进而危害变电站的安全运行,现有的方法无法检测土壤中的泄漏电流对空间磁场的影响。对此本文设计了一款以超薄的液晶聚合物LCP为介质基板的柔性宽带天线,用于准确检测变电站接地网的空间磁场,该天线的基本辐射单元为宽带单极子天线,采用了微带馈电的馈电方式。经软件仿真结果表明,该天线覆盖在0.5KHz-22KHz工作频段,已经满足了宽带天线的要求。

When a short circuit fault occurs in the substation grounding grid,the current on the conductor and the leakage current in the soil will generate a strong spatial magnetic field,which may affect the normal operation of the equipment in the station and endanger the safe operation of the substation.The existing method cannot detect the leakage in the soil.The effect of current on the magnetic field.In this paper,a flexible broadband antenna with ultra-thin liquid crystal polymer LCP as the dielectric substrate is designed to accurately detect the spatial magnetic field of the substation grounding grid.The basic radiating element of the antenna is a broadband monopole antenna,which adopts micro Feeding mode with feed.The software simulation results show that the antenna covers the working frequency range of 0.5 KHz-22 KHz,which has met the requirements of broadband antenna.