大地地磁感应电流与大地电导率关系的分析

磁暴产生的地磁感应电流(Geo-magnetically Induced Current,简称GIC)不仅在电网、输油气管道等导体中流动，还在大地中流动，研究大地GIC与大地电导率关系，对认识大地电导率对大地GIC和管网GIC的影响，以及准确计算管网系统的GIC具有重要意义。本文利用均匀大地电导率模型和分层大地电导率模型分别计算了不同深度大地GIC大小以及GIC分布规律，分析了均匀大地电导率模型和分层大地电导率模型与大地深层GIC的关系以及对GIC计算结果的影响。研究结果表明，大地电导率越小，大地GIC分布的深度越深，以及大地电性构造对大地和管网GIC大小和分布深度的影响很大。在此基础上，提出了下一步的研究建议。

Analysis of relationship between geo-magnetically induced current in earth and earth conductivity

Geo-magnetically Induced Current (GIC) caused by magnetic storm is not only flowing in power grid and oil/gas pipeline, but also flowing in earth. Studying the relationship between GIC in earth and earth conductivity is significant for understanding the impacts of conductivity on GIC in earth and conductors. This paper uses uniform earth conductivity model and layered earth conductivity model to calculate GIC density magnitude and distribution characteristics in different earth depth, analyzes the relationship between uniform/layered earth conductivity and GIC in deep earth and impacts of the two models on GIC calculated results. The results indicate that, the smaller the earth conductivity, the deeper the earth GIC distributes, and layered earth structure has great impact on magnitude and distributing depth of GIC in earth and conductors. On this basis, this paper proposes suggestions on f research.