宁东—山东高压直流输电对安丘地磁干扰分析

Analysis of geomagnetic disturbance of Ningdong-Shandong high voltage direct current transmission to Anqiu Seismic Station

以安丘地震台地磁观测数据受宁东—山东高压直流输电干扰为例,运用毕奥—萨伐尔定律,对影响地磁观测的高压直流输电干扰机理进行分析,从干扰时域、各分量影响程度、数据变化方向和幅度等方面总结干扰变化特征。通过单台初步判定法和多台对比分析法,准确识别干扰并进行合理的数据处理,保证数据的连续、完整、可靠,为其他地磁台站干扰识别及数据处理提供参考。

Taking geomagnetic disturbance caused by Ningdong-Shandong HVDC interference on Anqiu station as an example, the HVDC transmission effect of geomagnetic observation interference mechanism is analyzed using the Biot-Savart law. The characteristics of the disturbance variation from the interference in time domain, the influence degree of each component, the direction and magnitude of data changes are summarized. Accurate identification of interference data and reasonable data processing by single stage preliminary determination method and multiple comparison analysis method, we can ensure the continuity, completeness and reliability of data. This study provides a reference for other geomagnetic stations for identifying interference and data processing.