Analysis of Power Supply Interference of Geomagnetic Second Data Observation-Take Changli Seismic Station as An Example  

作　　者：TONG Xin ZHOU Jianqing LIU Zhe ZHANG Guoling GUO Jianfang 

机构地区：[1] Qinhuangdao Central Station,Hebei Earthquake Agency,Qinhuangdao 066100,China [2] Hebei Earthquake Agency,Shijiazhuang 050021,China

出　　处：《Earthquake Research in China》2020年第2期240-254,共15页中国地震研究（英文版）

基　　金：sponsored by the“Three-in-one Project”of China Earthquake Administration(163101)and the general project of Hebei Earthquake Agency。

摘　　要：This paper analyzes two types of power supply interference encountered in the observation of geomagnetic second data: the HVDC interference and the discharge interference of electrified railway. By taking the FGM fluxgate magnetometer of Changli Seismic Station as the research object,we analyze interference characteristics and conduct intensive observational experiment of electrified railway interference.Finally,several conclusions are obtained:(1) HVDC interference is closely related to the changes in the current system of the interference source,such as current size,distance or orientation of the interference source. Although the characteristics of each change are not the same, the main changes are variable.(2) The discharge phenomenon caused by the contact of the pantograph system or other reasons during the operation of the electrified railway is a factor that may cause random small interference in the geomagnetic second data at Changli Seismic Station. This study explains similar phenomena discovered in previous years and meanwhile correct previous misjudgments including unstable working systems,unstable power supply,and occasional sudden jumps that are considered to be discrete.

关 键 词：GEOMAGNETISM Electrified railway INTERFERENCE 

分 类 号：P318.6[天文地球—固体地球物理学]