摘要
简述了冲击接地电阻的基本理论,提出考虑火花效应时接地体等效模型,采用电磁暂态模拟软件PSCAD建立水平接地电极Π型等值电路计算模型,仿真分析了接地电极土壤电阻率及接地电极长度对冲击接地电阻的影响。仿真结果表明,在接地电极长度一定时,冲击接地电阻随土壤电阻率的增大而增大;在土壤电阻率不变时,接地电极冲击接地电阻随接地电极长度的增大而减小,慢慢趋于平稳直到稳定。
This paper states basic theory of impact grounding resistor and proposes equivalent model when considering spark effect. It establishes calculation model for II typed equivalent circuit of level grounding electrode and processes simulated a- nalysis on affect of soil resistivity and length of grounding electrode on impact grounding resistor. The simulation result shows that when length of grounding electrode is certain, impact grounding resistivity increases with increase of soil resistivi- ty while when soil resistivity is invariant, the impact grounding resistivity of grounding electrode may decrease with increase of length of grounding electrode until it goes slowly to stability.
出处
《广东电力》
2013年第1期46-49,共4页
Guangdong Electric Power
关键词
火花效应等效模型
接地电阻
接地体冲击特性
PSCAD
Π型等值电路
土壤电阻率
spark effect equivalent model
grounding resistor
impact performance of grounding body
PSCAD
U typed e- quivalent circuit
soil resistivity
