摘要
为了准确计算风电机组接地网的雷电冲击暂态特性,在考虑土壤电离特性的基础上,利用场路结合方法建立了接地网暂态分析模型。采用快速傅立叶变换,将频域和时域分析方法相结合,对考虑土壤电离时接地网的暂态特性进行了分析。研究结果表明,发生雷击事故时,埋设在地下的传输、通信和控制电缆的屏蔽层与其周围土壤将产生较高的电位差,这会对电缆最外层绝缘造成破坏,甚至会造成局部放电。
In order to calculate the lightning impulse transient characteristics of grounding network of wind power units, taking the ionization characteristic of soil into consideration, this paper establishes the transient analysis model for grounding network by circuit -field method. Combining the frequency and time domain analysis, the transient characteristics of grounding network when the soil is ionized is studied by Fast Fourier Transform. Study resuh shows that when lightning accident occurs, it will generates, between the shielding layer of the underground transmission, communication and control cable and the surrounding soil, relatively high potential difference which damages the external insulation layer of the cable, and even causes partial discharge.
出处
《黑龙江电力》
CAS
2011年第6期441-444,449,共5页
Heilongjiang Electric Power
关键词
雷电流
风电
过电压
接地
绝缘层
lightning current
wind power
overvohage
grounding
insulation layer
