输电线路近地电场对接地极腐蚀的影响及防腐蚀措施
Influence of Near-Earth Electric Field of Transmission Line on Grounding Electrode Corrosion and Corrosion Protection Measures
胡全 1胡泰山 2李波 1易永亮 3陈俊卫 1胡上茂 2汪金刚2
作者信息
- 1. 贵州电网有限责任公司电力科学研究院,贵阳 550002
- 2. 南方电网科学研究院有限责任公司,广州 200240
- 3. 中国南方电网有限责任公司超高压输电公司贵阳局,贵阳 550081
- 折叠
摘要
介绍了输电线路近地电场的计算理论,通过Maxwell平台建立同塔四回输电线路仿真模型,得到输电线路空间电场与近地电场分布特征.利用多电极耦合测量技术测量了多种电压等级输电线路变电站不同位置接地材料的腐蚀速率,以及有无近地电场情况下接地极的腐蚀速率,探讨了电场对接地极腐蚀的影响.最后,结合电场效应与电化学分析提出减缓接地极腐蚀的具体措施.结果表明:近地电场稳定,电场强度约为几十V/m,对近地场域的影响不可忽略;由于强电场的存在,接地材料的大气腐蚀速率增加了近80倍,且随着电压等级的提高,材料的腐蚀速率增大.
Abstract
The calculation theory of near-earth electric field of transmission line was introduced,and the simulation model of four-loop transmission line with the same tower was established through Maxwell platform to obtain the distribution characteristics of space electric field and near-earth electric field of transmission line.The corrosion rates of grounding material at different locations of transmission line substation in different voltage levels were measured by using multi-electrode coupling measurement technology,and the corrosion rates of grounding electrode in the presence or absence of near-earth electric field were also measured to study the influence of electric field on grounding electrode corrosion.Finally,the specific measures to mitigate the corrosion of grounding electrode were proposed by combining electric field effect and electrochemical analysis.The results show that the near-earth electric field was stable with intensity about tens of V/m,which could not be ignored.Due to the presence of strong electric field,the atmospheric corrosion rates of grounding material increased by nearly 80 times,and the corrosion rates of the material increased with the increase of voltage level.
关键词
接地极/电磁监测/腐蚀评估/瞬态电场仿真Key words
grounding electrode/electromagnetic monitoring/corrosion assessment/transient electric field simulation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据