摘要
提出了一种基于EMTP的接地体冲击电流作用下时-频特性分析方法,建立了考虑土壤火花放电的水平接地体时域传输线模型,利用该模型对水平接地体冲击特性进行了时域分析。通过对接地体注入电流、电压波形进行傅里叶变换,于频域内计算接地体不同频率响应下频域阻抗,详细分析了接地体冲击电流作用下的频域特性,并以此计算了接地体等效长度,分析了雷电流不同波头时间,幅值对接地体阻抗的影响。
In this paper,an analytical method of the Time–Frequency characteristics of horizontal electrode under lightning strike is presented based on EMTP,a transmission line model of horizontal electrode with the consideration of soil ionization is designed.It is easy to analysis the time-domain characteristic of horizontal electrode by using this model.Moreover,the impulse current and voltage are transformed by FFT analysis,then,the frequency impedance and effective length of horizontal electrode can be calculated,furthermore,the relationship of the magnitude and rise time of lightning with the frequency impedance can be gained.
出处
《电工技术学报》
EI
CSCD
北大核心
2011年第6期194-198,共5页
Transactions of China Electrotechnical Society
关键词
火花放电
水平接地体
频率阻抗
传输线
Soil ionization
horizontal electrode
frequency domain impedance
transmission line
