高压直流输电对大柏舍台地电场观测干扰的分析  

Interference Analysis of HVDC Transmission to Electric Field Observation of Dabaishe Station

作　　者：张波 谭大诚[2,3] 罗娜 尹小兵 吴鹤帅 ZHANG Bo;TAN Da-cheng;LUO Na;YIN Xiao-bing;WU He-shuai(Hongshan base station.Hebei Seismological Bureau,Hebei Xingtai 054000,China;Lanzhou Earthquake Research Institute,China Earthquake Administration,Gansu Lanzhou 730000,China;Gansu Seismological Bureau,Gansu Lanzhou 730000,China)

机构地区：[1]河北省地葙局红山基准台,河北邢台054000 [2]中国地震局兰州地震研究所,甘肃兰州730000 [3]甘肃省地藤局,甘肃兰州730000

出　　处：《地震》2020年第1期140-150,共11页Earthquake

基　　金：河北省地震局地震科技星火计划青年项目(DZ20180320016)

摘　　要：在分析高压直流输电对地电场观测产生干扰原因的基础上,应用大柏舍台近年来受高压直流输电干扰的地电场数据分析受高压直流干扰时的地电场变化、入地电流、换流站接地极与台址关系,计算了高压直流输电干扰时台址岩体裂隙优势方位。结果表明:地电场变化形态仅在高压输电入地电流开始注入和停止注入时产生大幅度的跃变;高压直流输电干扰时电场强度与入地电流大小成正比,与台址到换流站接地极的距离的平方成反比;应用地电场潮汐变化前10阶谐波振幅计算台址岩体裂隙优势方位的方法有甄别高压直流输电干扰的效果。Based on the analysis of the cause of interference caused by HVDC transmission to geoelectric field observation,the changes of geoelectric field,earth-fault current and the relationship between the ground electrode of the converter station and station location were analyzed by geoelectric field data of Dabaishe station disturbed by HVDC transmission in recent years.Meanwhile,the dominant orientation of rock fracture of site of geoelectric field interfered by HVDC was calculated.The results showed that the morphology of geoelectric field only changes dramatically when high voltage transmission earth-fault current begins to inject and stops injecting.The electric field intensity was proportional to the earth-fault current and inversely proportional to the square of the distance from the station location to the ground electrode of the converter station when HVDC transmission was interfered.The method calculating the dominant orientation of rock fracture of station location can discriminators effect HVDC interference by first 10 order harmonic amplitudes of tidal changes in geoelectric field.

关 键 词：高压直流输电 地电场观测 岩体裂隙优势方位α角 

分 类 号：P315.7[天文地球—地震学]