【摘要】 目前,特高压直流输电线路对地震台地电场观测的干扰影响亟需解决。根据地电场观测仪器的工作原理,分析了直流输电线路干扰地电场观测的原因,认为线路接地极入地电流使土壤的电位分布发生了变化,从而改变了埋设在土壤中的地电场观测仪器电极处的电位。通过改变仪器电极布置的方法,建立了距直流线路接地极不同位置处的电场计算模型,计算得到了不同电极布置方式下地电场观测受干扰的变化规律。结果表明观测仪器电极取不同极间距离和不同布置方向均会影响干扰水平,当极距取100 m或电极连线与接地极径向线成45°时有干扰最小值。更多还原

【Abstract】 The interference from UHVDC power lines is a key issue puzzling the geoelectric field observation in seismic station. According to the working principle of geoelectric field observation instrument,the interference reason on geoelectric field observation is analyzed,which potential distribution of the electrodes in soil of geoelectric field observation instrument is changed by the ground current from ground electrode of power line. Based on the different electrode arrangements,the electric field calculation model at different positions away from ground electrode is established,and thus the variation could be acquired. The results show that interference values are affected due to the electrode spans and the electrode arrangement directions,and there has the minimum interference when the electrode span is 100 m or the angle between line of two electrodes and radial line of ground electrode is 45°.更多还原