高压直流输电干扰对安徽地电场观测影响分析  

Analysis of Influence of HVDC Interference on Geo-electric Field Observation in Anhui Province

作　　者：尹天杰 孙亮亮[1] 张明明 YIN Tianjie;SUN Liangliang;ZHANG Mingming(Bengbu Seismic Central Station,Anhui Seismological Bureau,Anhui Bengbu 233000;Mengcheng geophysics national field scientific observation and research station,Anhui Mengcheng 233500,China)

机构地区：[1]安徽省地震局蚌埠地震监测中心站,安徽蚌埠233000 [2]安徽省蒙城地球物理国家野外科学观测研究站,安徽蒙城233500

出　　处：《四川地震》2021年第4期35-39,共5页Earthquake Research in Sichuan

基　　金：安徽省地震局青年基金项目(20210608)。

摘　　要：通过分析安徽地区蒙城、嘉山两个地电场台站观测数据在受到高压直流输电线路干扰时的变化,发现以下特征,畸变形态上出现:共有矩形方波型、锯齿形方波型和尖峰突跳型三种类型;变化方向上出现:同一台站不同测向畸变方向并不统一;变化幅度上出现:同一测向长短极距变化幅度值接近,不同台站变化幅度有差异性。本文通过分析可以得出以下结论:(1)畸变形态主要和干扰持续时间以及入地电流值有关;(2)变化方向取决于附加电位差的正负;(3)干扰下的变化幅度值与台站和换流站的距离平方成反比,与传播介质电导率也成反比。By analyzing the data changes of the geo-electric field stations in Mengcheng County and Jiashan County in Anhui Province that are disturbed by HVDC transmission lines,we found the following three types of distortion forM_(S)that are the rectangular wave form,saw-tooth-shaped square wave and spike-jump form.The variation direc-tions are different at the same station.The range of variation is close to the range of the same direction while the variation range of different stations is different.Through the analysis,the following conclusions can be drawn that①the distortion is mainly related to the duration of interference and the value of ground current,②the direction of change depends on the plus or minus of the additional potential difference,and③the amplitude of the variation is inversely proportional to the square of the distance between the station and the converter station,and also is inverse-ly proportional to the conductivity of the propagation medium.

关 键 词：高压直流输电 地电场 电导率 电位差 

分 类 号：P319.[天文地球—固体地球物理学]