高压直流输电干扰对江苏省地电场观测的影响

Effects of HVDC Power Transmission Interference on Geoelectric Field Observations in Jiangsu Province

本文主要是对江苏省4个地电场台站2015—2019年地电场观测数据受全国高压直流输电线路干扰情况进行分析总结,重点分析锡泰线、晋南线、锦苏线和昌宣线等几条线路对其影响特点及数据干扰幅度,得到以下结论:(1)高压直流输电线路干扰对地电场观测数据的干扰是一个远场干扰源,表现为受同一高压直流输电线路干扰时,同一台站同一方向的长短极距观测数据变化幅度之比接近1。(2)各台站受高压直流线路干扰产生的数据变化形态、变化方向和变化幅度不尽相同,这与台站位置、高压线路换流站位置、接地极相对位置以及地下传播介质有关。该研究结果可以为地电场观测受高压直流输电线路的干扰判别提供参考,服务于地电场观测数据的应用。

This work mainly analyzes and summarizes the observation data of four geoelectric field stations in Jiangsu Province from 2015 to 2019 subjected to interference by national high-voltage direct current(HVDC)transmission lines.The influence characteristics and data interference magnitude of the Xitai,Jinnan,Jinsu,and Changxuan lines are mainly considered.The conclusions are as follows.(1)The interference of the HVDC transmission lines with the geoelectric field observation data is a far-field interference.Under the interference of the same HVDC transmission lines,the range of the change ratio of the observation data at a long polar distance and short polar distance of the same station in the same direction is close to 1.(2)The forms,directions,and ranges of the data change of different stations caused by HVDC line interference differ in terms of station location,HVDC converter station location,relative position of ground electrode,and underground transmission medium.The results can provide a reference for the discrimination of geoelectric field observations disturbed by HVDC transmission lines.They may also be applied to geoelectric field observation data.