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Analysis of Power Supply Interference of Geomagnetic Second Data Observation-Take Changli Seismic Station as An Example
TONG Xin1, ZHOU Jianqing1, LIU Zhe1, ZHANG Guoling2, GUO Jianfang1
1.Qinhuangdao Central Station, Hebei Earthquake Agency, Qinhuangdao 066100, China;2.Hebei Earthquake Agency, Shijiazhuang 050021, China
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
DOI:10.19743/j.cnki.0891-4176.202002005
分类号:
基金项目:This project is sponsored by the "Three-in-one Project" of China Earthquake Administration(163101) and the general project of Hebei Earthquake Agency.
Analysis of Power Supply Interference of Geomagnetic Second Data Observation-Take Changli Seismic Station as An Example
TONG Xin1, ZHOU Jianqing1, LIU Zhe1, ZHANG Guoling2, GUO Jianfang1
1.Qinhuangdao Central Station, Hebei Earthquake Agency, Qinhuangdao 066100, China;2.Hebei Earthquake Agency, Shijiazhuang 050021, China
Abstract:
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.
Key words:  Geomagnetism  Electrified railway  Interference