太原地震监测中心站地磁数据受高压直流输电干扰的识别处理

Identification and Processing of Geomagnetic Data Disturbed by HVDC Transmission in Taiyuan Earthquake Monitoring Center Station

使用“中国地震前兆数据处理系统—地磁学科版”软件,将太原地震监测中心站的FHDZ-M15秒数据与多台站的地磁秒数据进行对比,量算出上临线等高压直流输电线路对太原站地磁数据的干扰幅度,进行相关性和误差分析。结果表明,高压直流输电对太原站地磁数据干扰幅度与台站至线路垂直距离成线性反比;F、H、D三分量干扰幅度与Z分量干扰幅度呈高度线性相关;以Z分量变化量为因变量,使用参考拟合公式,求取F、H、D的变化量,可用于地磁高压直流输电干扰的日常处理中。

Using the software"China Seismic Precursor Data Processing System-Geomagnetism Subject Edition",the FHDZ-M15second data of Taiyuan Earthquake Monitoring Center Station is compared with those of many stations.The interference amplitude of HVDC transmission lines such as the upper and adjacent lines to the geomagnetic data of Taiyuan Seismic Station is measured,and the correlation and error analysis are also carried out.The results show that the interference amplitude of HVDC transmission to the geomagnetic data of Taiyuan Seismic Station is inversely proportional to the vertical distance between the station and the line.The interference amplitude of F,H,D components is highly linear with that of Z component.Taking the variation of Z component as the dependent variable and using the reference fitting formula,the variation of F,H,D can be obtained,which can be used in the daily processing of geomagnetic HVDC transmission interference.