摘要
接地装置与土壤间的接触电阻的正确估算,对于提高接地网设计施工水平、合理选择接地导体规格都有重要意义。但其准确值尚无科学的计算方法,所以在实际工程设计中一般无法准确考虑。为此,通过建立一种接触电阻的仿真分析模型,利用有限元工具ANSYS,就不同工况对接触电阻的影响进行了分析;仿真计算结果表明,接地导体规格、土壤特性是影响接触电阻大小的主要因素;为了便于计算复杂接地网的接触电阻,在原模型的基础上建立了一种简化模型;依据简化模型、利用接地分析软件CDEGS对不同接地网的接触电阻进行了计算;最后提出了实际工程中减小接触电阻的方法,为接地设计及施工提供了参考。
Proper calculation of contact resistance between grounding device and soil is important for raising the level of ground grids design and construction,as well as selecting suitable conductor sizes.Generally,it is not accurately considered in actual ground project for the sake of no accurate method for calculating.Consequently,we established a simulation model,by which calculations were made on the contact resistance under different conditions with ANSYS（finite element software）.By theoretical calculation,conductor sizes and soil nature were figured out to be main factors affecting the magnitude of the contact resistance.To easily calculate the contact resistance of complex grounding grids,a simplified model was built based on original model,with which contact resistances of different grounding grids were calculated in CDEGS（software for grounding analysis）.In order to give advices for design and construction of grounding,methods are proposed to reduce contact resistance in actual project.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第10期2393-2397,共5页
High Voltage Engineering
基金
国家自然科学基金重点项目(50737001)~~
关键词
接地
接触电阻
仿真模型
土壤特性
导体规格
实际工程
grounding
contact resistance
simulation model
soil nature
conductor size
actual project
