摘要
为解决特高压直流输电线路对地震台地电场观测的干扰影响问题,根据地电场观测仪器的工作原理,分析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.针对直流线路接地极不同形状,考虑大地为水平分两层的土壤模型,根据等值复数镜像法推导出单一垂直接地体、水平双环接地体和多个垂直接地体的入地电流在土壤中的电位计算公式,计算并分析了多种情况下直流线路对地电场观测的干扰水平.结果表明,采用水平双环形接地极可减小50%左右的干扰值,采用8个垂直接地极可减小87%左右的干扰值.
The interference from UHVDC power lines is a key issue puzzling the geoelectric fieldobservation in seismic station. According to the working principle of geoelectric field observationinstrument, the interference reason on geoelectric field observation is analyzed, which potential distri-bution of the electrodes in soil of geoeleetric field observation instrument is changed by the ground cur-rent from ground electrode of power line. According to the ground electrodes with various shapes of DCpower line, the calculation formulas of potential in soil from the ground current on one vertical groundelectrode, horizontal double - ring ground electrode and eight vertical ground electrodes are derived byequivalent complex image method, which the soil is represented as horizontal two -layer mathematicmodel. Therefore, the interference level on geoelectric field observation from DC power lines undervarious situations is calculated and researched. The results show that interference level could bereduced 50% for horizontal double -ring ground electrode, and be reduced 87% for eight verticalground electrodes.
出处
《福州大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第3期405-410,417,共7页
Journal of Fuzhou University(Natural Science Edition)
基金
国家电网公司科学技术项目(SG11008)
湖北省教育厅科学技术研究项目(Q20131302)
关键词
特高压
直流输电线路
地电场观测
接地极形状
等值复数镜像法
入地电流
UHVDC
power lines
geoelectric field observation
shapes of ground electrode
equiva- lent complex image method
ground current
