摘要
随着特高压直流输电工程的建设,直流输电系统对邻近地震台站的地震观测干扰日显突出。基于直流输电系统对地电阻率观测的干扰机理,引入等值复镜像法,建立了大尺度范围下3维复杂土壤电性模型,推导了接地极入地电流在土壤任一点的电位计算公式。在±800 kV锦屏—苏南特高压直流输电工程带电调试期间,进行了地电阻率观测台与野外观测点的联合地电阻率观测干扰实验。结果表明,在线路与观测点的距离不超过10 km时,提出的数学模型及其计算方法具有较高的精度,其计算误差不超过10.28%。
The interference on geoelectric resistivity observation of seismic station from UHVDC power lines becomes increasingly prominent with growth of UHVDC transmission projects. According to the interference mechanism of DC transmission lines on geoelectric resistivity observation, the authors have established a 3-D combined-layer soil model to calculate the potential distribution of grounding current in soil. An equation for the potential distribution at any position is deduced by using the model and equivalent complex image method. Geoelectric resistivity observation experiments are conducted at both observatories and field observation points during the live debugging of ±800 kV Jin- ping-Sunan UHVDC power line. Further analysis indicates that the obtained results by using the proposed model and equations are in good accordance with the experimental results, and the error is less than 10.28%, while the distance between DC power line and geoelectric resistivity observation of seismic station is no more than 10 km.
出处
《高压电器》
CAS
CSCD
北大核心
2016年第10期32-37,共6页
High Voltage Apparatus
基金
国家电网公司科技项目(SG11008)
湖北省教育厅科学技术项目(Q20131302)~~
关键词
特高压直流接地极
入地电流
地电阻率观测
3维复杂土壤模型
等值复数镜像法
干扰验证实验
UHVDC power line
grounding current
geoelectric resistivity observation
3-D complex soil model
equivalent complex image method
interference experiment of geoelectric resistivity observation
