摘要
为准确掌握地下金属管道对接地网地表电位的影响,基于场路结合的思路计算了考虑接地网附近金属管道散流分布时的接地网地表电位分布,分析了金属管道长度及孔径等变化对接地网地表电位的影响;同时,对一实际35 kV变电站接地网的地表电位进行了现场测试。结果表明:地下金属管道会降低接地网附近的地表电位,且下降幅度与金属管道长度或孔径的增加程度有关;但该影响范围通常只限于距离管道5 m之内的区域。研究结果可为基于地表电位分布的接地网故障诊断方法提供依据。
In order to accurately understand influence of underground metal pipelines on earth grounding grid, this paper calculates earth surface potential distribution of the grounding grid considering current distribution of metal pipelines close to the grid based on field-circuit combination. It analyzes influentures of metal pipelines and performs site test on earth surface potential of the grounding grid ofsults indicate underground metal pipelines will decrease earth surface potential near the grounding grid and decrease range is related with length or aperture of the metal pipeline. However scope of the influence is limited within 5 m. sults may provid basis for fautt diagnosis of the grounding grid based on earth surface
出处
《广东电力》
2017年第10期99-103,共5页
Guangdong Electric Power
基金
国家自然科学基金项目(51307109)
关键词
变电站
接地网
现场测试
地表电位
金属管道
substation
grounding grid# site test
earth surface potential
metal pipeline
