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本文聚焦于锦州义县和阜新哈达户稍两个地电场观测台站，分析其在2018—2022年期间受高压直流输电（HVDC）干扰的情况。通过详细分析干扰幅度、形态和变化方向等关键指标，并结合高压直流输电的干扰机理，分别探讨了不同换流站接地极对同一观测台站的影响，以及同一换流站接地极对不同观测台站的影响。研究结果表明：（1）不同的高压直流输电线路对地电场的干扰形态和幅度存在显著差异。在辽宁西部区域，干扰变化形态呈现出方波或“凹”形方波的特征；（2）当高压直流输电对地电场观测产生干扰时，不同方向上的长、短极距变化并非始终同步，附加电场信号的变化特征也存在差异。然而，在同一方向上，这些变化通常表现出一致性；（3）针对同一高压直流输电线路的干扰，两个不同地电场观测点的数据比值主要取决于它们与干扰源的距离以及所在区域的电导率，而与高压直流输电线路产生的入地电流大小无直接关联。本研究结果对于辽宁地区地电场观测数据的分析具有重要意义，有助于快速判断观测数据中的异常是否由高压直流输电引起，从而为辽宁地区地电场观测数据的准确解读和应用提供有力支持。
Abstract：This study mainly focuses on the interference situation of the two geoelectric field observation stations in Yixian County,Jinzhou and Hadahushao,Fuxin City from 2018 to 2022 caused by high-voltage direct current(HVDC) transmission. Through detailed analysis of key parameters such as interference amplitude, morphology, and change direction, combined with the interference mechanism of HVDC transmission,the study analyzes the impact of different converter station grounding electrodes on the same observation station and the impact of the same converter station grounding electrode on different observation stations. The research results show that:(1) Different HVDC transmission lines have different interference patterns and amplitudes to the geoelectric field,and the interference change patterns in the western region of Liaoning present the characteristics of square waves or “concave” square waves.(2) When HVDC transmission produces interference to geoelectric field observations, the changes in long and short polar distances in different directions are not always synchronized,and there are also differences in the variation characteristics of additional electric field signals. However,in the same direction,these changes tend to be consistent.(3) For the interference of the same HVDC transmission line, the data ratio of two different geoelectric field observation points mainly depends on their distance from the interference source and the conductivity of the area, and is not directly related to the size of the grounding current generated by the HVDC transmission line. The research results are of great significance for the analysis of geoelectric field observation data in the Liaoning region, which can quickly determine whether the abnormalities in the observation data are caused by HVDC transmission, thus providing strong support for the accurate interpretation and application of geoelectric field observation data in the Liaoning region.
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基本信息:
DOI：10.13693/j.cnki.cn21-1573.2025.03.009
中图分类号:TM721.1;P319
引用信息:
[1]赵倩,张琪,安祥宇,等.高压直流输电对辽宁西部地电场观测的影响分析[J].防灾减灾学报,2025,41(03):66-73+94.DOI:10.13693/j.cnki.cn21-1573.2025.03.009.
基金信息:
辽宁省地震局青年科研基金项目(LN202303Q)