特高压直流输电线路对不同布极方式的地电场观测干扰
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摘要
目前,特高压直流输电线路对地震台地电场观测的干扰影响亟需解决。根据地电场观测仪器的工作原理,分析了直流输电线路干扰地电场观测的原因,认为线路接地极入地电流使土壤的电位分布发生了变化,从而改变了埋设在土壤中的地电场观测仪器电极处的电位。通过改变仪器电极布置的方法,建立了距直流线路接地极不同位置处的电场计算模型,计算得到了不同电极布置方式下地电场观测受干扰的变化规律。结果表明观测仪器电极取不同极间距离和不同布置方向均会影响干扰水平,当极距取100 m或电极连线与接地极径向线成45°时有干扰最小值。
The interference from UHVDC power lines is a key issue puzzling the geoelectric field observation in seismic station. According to the working principle of geoelectric field observation instrument,the interference reason on geoelectric field observation is analyzed,which potential distribution of the electrodes in soil of geoelectric field observation instrument is changed by the ground current from ground electrode of power line. Based on the different electrode arrangements,the electric field calculation model at different positions away from ground electrode is established,and thus the variation could be acquired. The results show that interference values are affected due to the electrode spans and the electrode arrangement directions,and there has the minimum interference when the electrode span is 100 m or the angle between line of two electrodes and radial line of ground electrode is 45°.
The interference from UHVDC power lines is a key issue puzzling the geoelectric field observation in seismic station. According to the working principle of geoelectric field observation instrument,the interference reason on geoelectric field observation is analyzed,which potential distribution of the electrodes in soil of geoelectric field observation instrument is changed by the ground current from ground electrode of power line. Based on the different electrode arrangements,the electric field calculation model at different positions away from ground electrode is established,and thus the variation could be acquired. The results show that interference values are affected due to the electrode spans and the electrode arrangement directions,and there has the minimum interference when the electrode span is 100 m or the angle between line of two electrodes and radial line of ground electrode is 45°.
引文
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[15]赵畹君.高压直流输电工程技术[M].北京:中国电力出版社,2004.
[2]CORNEY R C,BURNS G B,MICHAEL K.The influence of polar-cap convection on the geoelectric field at Vostok,Antarctica[J].Journal of Atmospheric and Solar-Terrestrial Physics,2003,65(3):345-354.
[3]Mohamed Metwaly,Gad El-Qady,Usama Massoud.Integrated geoelectrical survey for groundwater and shallow subsurface evaluation:case study at Siliyin spring,El-Fayoum,Egypt[J].Arabian Journal of Geosciences,2011,4(3):543-550.
[4]林向东,徐平,鲁跃,等.地电场观测中几种常见干扰[J].华北地震科学,2007,25(1):17-21.LIN Xiang-dong,XU Ping,LU Yue,et al.Several typical interferences in geoelectric observation[J].North China Earthquake Sciences,2007.25(1):17-21.
[5]席继楼,邱颖,刘超,等.电极极化电位对地电场观测影响研究[J].地震地磁观测与研究,2008,29(6):22-26.XI Ji-lou,QIU Ying,LIU Chao,et al.Analysis and study on the influence of polarization potential in measuring geoelectric field[J].Seismological and Geomagnetic Observation and Research,2008.29(6):22-26.
[6]董晓娜,曲利,胡旭辉,等.邹城地震台地电场观测数据分析及干扰排查[J].高原地震,2010,22(4):38-42.DONG Xiao-na,QU Li,HU Xu-hui,et al.Analysis on observation data of geo-electric field and interferences in Zoucheng seismic station[J].Plateau Earthquake Research,2010,22(4):38-42.
[7]QIAN Fu-ye,ZHAO Yu-lin,XU Tong-chun.An analysis of the seasonal variation of disturbance in georesistivity[J].Acta Seismologica Sinica,1988,1(3):69-83.
[8]齐磊,崔翔,吴燕.交流输电线路对地震观测台站的最小距离研究[J].高电压技术,2010,36(3):649-656.QI Lei,CUI Xiang,WU Yan.Minimum distance between AC transmission line and seismic observation station[J].High Voltage Engineering,2010,36(3):649-656.
[9]唐波,文远芳,刘红志,等.直流输电线路对地磁场观测的影响[J].高电压技术,2011,37(4):952-960.TANG Bo,WEN Yuan-fang,LIU Hong-zhi,et al.Influence of DC transmission line on geomagnetic observation[J].High Voltage Engineering,2011,37(4):952-960.
[10]唐波,张建功,孟遂民,等.直流输电线路对地磁场Z分量观测干扰的校正[J].中国电机工程学报,2012,32(30):147-155.TANG Bo,ZHANG Jian-gong,MENG Sui-min,et al.Correction of observation interference on Z component of geomagnetic field from DC power lines[J].Proceedings of the CSEE,2012,32(30):147-155.
[11]李晓东,袁顺,王宝柱.地电场架设中需要注意的问题以及干扰的排除[J].内陆地震,2008,22(4):349-354.LI Xiao-dong,YUAN Shun,WANG Bao-zhu.Some problems and interference elimination of earth electric field instrument erection[J].Inland Earthquake,2008,22(4):349-354.
[12]方炜,张国强,邵辉成.高压直流输电对地电场观测的影响[J].地震地质,2010,32(3):434-441.FANG Wei,ZHANG Guo-qiang,SHAO Hui-cheng.STUDY ON THE IMPACT OF HVDC to geoelectric field observation[J].Seismology and Geology,2010,32(3):434-441.
[13]中国地震局监测预报司.地震电磁数字观测技术[M].北京:地震出版社,2002.
[14]中国国家标准化管理委员会.GB/T 19531.2-2004地震台站观测环境技术要求第2部分:电磁观测[S].北京:中国标准出版社,2004.
[15]赵畹君.高压直流输电工程技术[M].北京:中国电力出版社,2004.
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