【摘要】 为减小直流输电线路对地磁场观测的干扰,采用数学计算的方法精确求解了线路对地磁Z分量的干扰水平。以观测点为原点建立了地磁仪器观测点坐标系,推导了观测点坐标系各坐标轴在地心坐标系中的单位矢量表达式。根据空间矢量点积的定义,得到了空间电流磁场矢量投影到地磁Z分量方向的求解公式。利用推导的公式和直流线路电流磁场三维计算模型,最终求得直流线路对地磁Z分量观测的干扰水平。由此,开发了"直流线路对地磁观测干扰校正系统",并开展了地磁台站和野外联合地磁观测干扰实验。结果表明,直流线路和地磁观测台站距离不超过10km时,提出的数学模型和计算方法误差不超过5%。更多还原

【Abstract】 In order to reduce the interference on geomagnetic field observation from DC power lines,the observation interference on Z component of geomagnetic field was solved accurately using mathematical calculation method.The geomagnetic observation point coordinate system with observation point as coordinate origin was constructed,and then the unit vector expression equations,which represented each axis of observation point coordinate system in geocentric coordinate system,were deduced.Based on the definition of space vector dot product and the three-dimensional current magnetic field calculation model of power lines,the calculation equation of space current magnetic field vector projected on the direction of Z component vector was acquired.Therefore,the "Interference on geomagnetic observation from DC power lines correction system" was developed.The geomagnetic field observation interference experiment was accomplished by station observation combined with field observation.The results showed that the error of proposed mathematical model and solution methods was less than 5%,while the distance between DC power line and geomagnetic observation station was no more than 10?km.更多还原