自动气象观测场站地网性能分析与研究

Analysis and Research on Ground Performance of Automatic Weather Station

自动气象观测场站包含集成度较高且耐压能力较弱的电子设备,易因雷电过电压、故障电压等造成损坏。采用CDEGS软件对自动气象观测站两种不同布置形式地网的接地性能进行仿真分析,将地电位升、跨步电压以及接触电压仿真结果与理论计算值进行对比,得出两种地网仿真对比后接地性能的一般规律:地电位升由地网中心地带向地网边缘地带呈现逐渐降低的趋势且中心下降幅度较边缘大;跨步电压大小与接地体距离成反比,与接地系统网格间距成正比;接触电压由接地网边缘向中心地带逐渐降低;在地网面积相同的前提下,网格状地网地电位升、接触电压以及跨步电压值较标准地网小,接地性能更优。

Automatic weather station （AWS） consist of electronic equipments with high level of integration and low voltage withstand capability, this make them very vulnerable to be damaged by lightning overvoltage and fault voltage. The ground performance of two different forms of AWS grounding layout are simulated and analyzed with CDEGS , simulation results of ground potential rise, step voltage and touch voltage are compared with theoretical calculation results, the general rule of ground performance is obtained： Ground potential rise shows a decreasing trend from the center of the network to the edge ,the rate of decrease in the center is higher than that in the edge;The step voltage is inversely proportional to the distance to grounding, and it is proportional to the grid spacing of the grounding system; The touch voltage decreases from the edge of the network to the center, and the minimum voltage appears in the center of the ground network.; in case of the same area of ground network, the ground potential rise value, the step voltage value and the touch voltage value of the grid- like ground network is lower than that of the standard AWS field, and has better grounding performance.