摘要
为便于在埋地电缆电磁暂态分析中合理地选择大地阻抗的计算公式,从理论和仿真两方面对埋地电缆大地阻抗的几种常用计算公式进行了比较,分析了大地阻抗和导纳随土壤电导率的变化规律,并研究了大地导纳对埋地电缆电磁暂态响应的影响.结果表明,一些大地阻抗计算公式在低频时能提供足够的精度,但高频情况下误差较大;埋地电缆的大地阻抗对土壤电导率的变化不敏感,但其大地导纳对土壤电导率的变化比较敏感;在埋地电缆电磁暂态分析中,大地导纳具有重要的影响.
In order to be convenient for choosing the calculation expression of buried cable＇s ground impedance, some of common expressions to calculate the buried cable＇s ground impedance were compared by theoretical analysis and numerical simulation. Then, the changing laws of ground impedance and admittance with earth conductance were analyzed. At last, the influence of ground admittance on buried cable＇s electromagnetic transient response was researched. Results show that： some expressions are accurate enough in low frequency, but when the frequency is high, the calculation deviation is large; buried cable＇s ground impedance is not sensitive to the ground conductivity, but the ground admittance varies strongly with the ground conductivity; and ground admittance has important influence on buried cable＇s electromagnetic transient analysis.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2013年第2期185-189,194,共6页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金资助项目(50977091)
关键词
埋地电缆
电磁暂态分析
传输线模型
大地阻抗
大地导纳
buried cable
electromagnetic transient analysis
transmission line model
ground impedance
ground admittance
