高压直流输电对地电场观测的影响
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摘要
高压直流输电是解决长距离输送电的一种重要手段,近年来,随着中国高压直流输电骨架网的建设,在地震地电场观测中出现了一种新的干扰异常。以关中地区宝鸡、乾陵和周至地电场观测受宝鸡-德阳±500kV直流输电工程影响为例,分析了此类干扰异常的变化形态和特征,并结合高压直流输电的基本原理,对异常的形成机理进行了探讨,定量的计算了不同距离、影响区电导率和高压直流输电入地电流等对地电场观测的可能影响。结果表明,在理想状态下,电导率γ取0.01时理论值与实际观测值基本相符。
HVDC is an important way to solve the electricity transmission over long distances.With the construction of the skeleton of HVDC network in recent years,a new interference anomaly in seismic geoelectric field observation is emerging in China.In this paper,we take Baoji,Qianling and Zhouzhi geoelctric field observations in Central Shaanxi as an example to analyze the changes in shape and characteristics of such anomalies interfered by the Baoji-Deyang ± 500kV DC transmission project,discuss their forming mechanism combined with the basic principles of HVDC,and calculate their possible effects to electric field observations with different distances,conductivities and current into the earth.The results show that,the theoretical and observed geoelectric field values match well when conductivity is 0.01.
HVDC is an important way to solve the electricity transmission over long distances.With the construction of the skeleton of HVDC network in recent years,a new interference anomaly in seismic geoelectric field observation is emerging in China.In this paper,we take Baoji,Qianling and Zhouzhi geoelctric field observations in Central Shaanxi as an example to analyze the changes in shape and characteristics of such anomalies interfered by the Baoji-Deyang ± 500kV DC transmission project,discuss their forming mechanism combined with the basic principles of HVDC,and calculate their possible effects to electric field observations with different distances,conductivities and current into the earth.The results show that,the theoretical and observed geoelectric field values match well when conductivity is 0.01.
引文
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张学民,卢军.2007a.腾冲台强震前地电场线性极化特征[J].地震,27(2):89—98.ZHANG Xue-min,LU Jun.2007a.Linear polarization feature of geoelectric field before strong earthquakes at Tengchong station[J].Earthquake,27(2):89—98(in Chinese).
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中国地震局监测预报司.2002.地震电磁数字化观测技术[M].北京:地震出版社.49—60.Monitoring and Prediction Division of China Earthquake Administration.2002.Digital Seismic Observation of Electro-magnetic Technology[M].Seismological Press,Beijing.49—60(in Chinese).
马钦忠,钱家栋.2003.地下电性非均匀结构对地电场信号的影响[J].地震,23(1):1—7.MA Qin-zhong,QIAN Jia-dong.2003.The influence of inhomogeneous geoelectric structure on the signals of geoelectric field[J].Earthquake,23(1):1—7(in Chinese).
马钦忠,赵卫国,张文平.2008.文县地电场震前异常变化及其在2001年昆仑山口西MS8.1地震预测研究中的应用[J].地震学报,31(6):660—670.MA Qin-zhong,ZHAO Wei-guo,ZHANG Wen-ping.2008.Abnormal variations of geoelectric field recorded at Wenxian station preceding earthquakes and their application to the prediction of the2001MS8.1Kunlun earthquake[J].Acta Seismologica Sinica,31(6):660—670(in Chinese).
毛桐恩,席继楼,王燕琼,等.1999.地震过程中的大地电场变化特征[J].地球物理学报,42(4):520—528.MAO Tong-en,XI Ji-lou,WANG Yan-qiong,et al.1999.The variation characteristics of the telluric field in the process of earthquake[J].Chinese Journal of Geophysics,42(4):520—528(in Chinese).
邱颖.2008.地电场观测中已知干扰源抑制研究[D]:[学位论文].兰州:中国地震局兰州地震研究所.5—7.QIU Yin.2008.Research on restraining the known source interference in geoelectric field observation[D].Master The-sis.Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou.5—7(in Chinese).
阮爱国,赵和云.2000.提取地震地电场异常的垂直极化方向投影法[J].地震学报,22(2):171—175.RUAN Ai-guo,ZHAO He-yun.2000.Recognize seismic anomaly of telluric field by data projection vertical to the polari-zation[J].Acta Seismological Sinica,22(2):171—175(in Chinese).
桑绮.2006.输变电设备电场、磁场分布和距离防护研究[D]:[学位论文].杭州:浙江大学.4—8.SAN Qi.2006.Study on distance protection of power frequency electric and magnetic field from transmission and power transfer[D].Master Thesis.Zhejiang University,Hangzhou.4—8(in Chinese).
田山,王建国,徐学恭,等.2009.大地电场观测地震前兆异常提取技术研究[J].地震学报,31(4):424—431.TIAN Shan,WANG Jian-guo,XU Xue-gong,et al.2009.Research on the technique of extracting seismic precursory a-nomaly from telluric electric field observation[J].Acta Seismological Sinica,31(4):424—431(in Chinese).
王官洁,任震.1997.高压直流输电技术[M].重庆:重庆大学出版社.2—23.WANG Guan-jie,REN Zhen.1997.HVDC Transmission Technique[M].Chongqing University Press,Chongqing.2—23(in Chinese).
魏文博,谭捍东,金胜,等.2002.华北中部岩石圈电性结构:应县—商河剖面大地电磁测深研究[J].地球科学,27(5):645—650.WEI Wen-bo,TAN Han-dong,JIN Sheng,et al.2002.Conductivity structure of lithosphere in Central North China:Magnetotelluric study of Yingxian-Shanghe profile[J].Earth Science,27(5):645—650(in Chinese).
张学民,卢军.2007a.腾冲台强震前地电场线性极化特征[J].地震,27(2):89—98.ZHANG Xue-min,LU Jun.2007a.Linear polarization feature of geoelectric field before strong earthquakes at Tengchong station[J].Earthquake,27(2):89—98(in Chinese).
张学民,翟彦忠.2007b.远震前的地电场潮汐波异常[J].地震学报,29(1):48—58.ZHANG Xue-min,ZHAI Yan-zhong.2007b.Tidal wave anomalies of geoelectrical field before remote earthquakes[J].Acta Seismologica Sinica,29(1):48—58(in Chinese).
中国地震局监测预报司.2002.地震电磁数字化观测技术[M].北京:地震出版社.49—60.Monitoring and Prediction Division of China Earthquake Administration.2002.Digital Seismic Observation of Electro-magnetic Technology[M].Seismological Press,Beijing.49—60(in Chinese).
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