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深井接地极结构参数对其暂态温升的影响

Influence of Structure Parameters of Deep-Well Grounding Electrode on Its Transient Temperature Rise
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摘要 接地极是直流输电工程的重要组成部分,传统接地极占地面积大、选址和征地极其困难。南方电网提出了建设深井接地极解决该问题的技术路线,并开展了深井接地极示范工程建设。本文结合该示范工程实际建设情况,研究了接地极单个馈电棒的长度、所并联馈电棒的总数量、接地极埋深、馈电棒极间距和填充焦炭直径对深井接地极暂态温升的影响。研究结果表明:上述5种因素的变化能够导致接地极溢流密度变化,影响接地极的整体温升和最高温升。温升随着单个馈电棒的长度、所并联馈电棒的总数量、焦炭截面积的增加呈下降趋势,但降低幅度逐渐减小。接地极埋深需要基于极址的土壤的分层情况进行选择,选择合适的埋深使接地极处于低电阻率且电阻率比较均匀的土壤层中有利于降低接地极的温升。馈电棒极间距关系到极址的占地面积,受限于钻探深井的施工技术,极间距不能太小。 Grounding electrode is an important part of the DC transmission project. Traditional grounding electrode occupies a large area, causing us extremely difficult to select the site and perform requisition of lands. China Southern Power Grid proposes a technical route to solve the problem by constructing a deep-well grounding electrode, and carries out a demonstration project construction of deep-well grounding electrode. Based on the practice of the demonstration project, this paper studies the influence on the grounding temperature rise of the deep well by the length of the single electrode of the grounding electrode, the total number of parallel electrodes, the buried depth of the grounding electrode, the spacing of the electrodes, and the diameter of the filled coke. The results show that the above-mentioned five factors can cause changes in the grounding overflow density, which affects the overall temperature rise of the grounding electrode and the maximum temperature rise. The temperature rise shows a trend of decreases with the increase of the length of a single electrode, or the total number of parallel electrodes, or the cross-sectional area of coke, but the trend of decrease tends to be gradual. The buried depth of the grounding electrode needs to be selected according to the stratification of the soil at the electrode site. Choosing a suitable buried depth where the soil layer has low and relatively even resistivity, is beneficial to reduce the temperature rise of the grounding electrode. the spacing of the electrodes is related to the land occupied by the electrode site, but due to the limitation of the construction technique of deep well drilling, the electrode spacing cannot be too small.
作者 张延辉 陈家峰 胡上茂 蔡汉生 贾磊 鲁海亮 ZHANG Yanhui;CHEN Jiafeng;HU Shangmao;CAI Hansheng;JIA Lei;LU Hailiang(School of Electrical Engineering, Wuhan University, Wuhan 430072, China;Electric Power Research Institute, CSG, Guangzhou 510663, China)
出处 《南方电网技术》 CSCD 北大核心 2019年第5期22-29,共8页 Southern Power System Technology
基金 南方电网重大专项项目(WY-KJXM-20150901)~~
关键词 深井接地极 影响因素 整体温升 最高温升 deep-well grounding electrode influencing factors overall temperature rise maximum temperature rise
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