地震地磁观测与研究2025，Vol.46Issue(6)：53-61,9.DOI:10.3969/j.issn.1003-3246.2025.06.006
井下地电阻率电缆绝缘性能分析
Analysis on insulation performance of borehole cables for georesistivity measuremen—A case study of downhole cables at Linze Geoelectric Observation Station in Gaoyou
摘要
Abstract
To reduce the impact of surface electromagnetic interference with the observation environment,borehole georesistivity observation has been developed in China.In borehole georesistivity observation,the underground cable is the crucial pathway connecting the underground electrodes and instrument.Its insulation performance directly affects the reliability of the observation data.By investigating the ratio of grounding resistance to the sum of grounding resistance and insulation resistance,curves of the ratio varying with depth and the absolute values of curve extremes are obtained.A comparison between the measured grounding resistance,insulation resistance and the absolute extreme values allows a rapid judgment on whether the insulation performance of downhole cables affects the observations.Meanwhile,based on the measurement data from the Linze Geoelectric Observation Station in Gaoyou,the performance of its downhole cables is analyzed,and the reliability of the proposed rapid judgment method is verified.This study provides reference and support for the subsequent analysis of cable insulation performance,operation and maintenance of observation devices,as well as anomaly tracking and judgment at downhole georesistivity stations.关键词
井下地电阻率/井下电缆/漏电系数/接地电阻/绝缘电阻Key words
borehole georesistivity/the underground cable/insulation/grounding resistivity/insulation resistivity引用本文复制引用
高熹微,张骞,张秀霞,黄婷,李玉,郭宇鑫,胡超,黄峰,殷翔..井下地电阻率电缆绝缘性能分析[J].地震地磁观测与研究,2025,46(6):53-61,9.基金项目
江苏省地震局青年科学基金项目(项目编号:202407) （项目编号:202407）
