不同频域范围对水平接地体的雷电冲击响应特性的影响分析  

Analysis of the Effects of Different Frequency Domain on Lightning Impulse Response Characteristics of Horizontal Grounding Electrode

作　　者：马御棠 高竹青[2] 周仿荣 马仪 曹晓斌[2] 杜俊乐 田明明[2] MA Yutang GAO Zhuqing ZHOU Fangrong MA Yi CAO Xiaobin DU Junle TIAN Mingming(Yunnan Electrie Power Test Institute Co., Ltd. Electric Power Research Institute, Kunming 650051, China Sehool of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China)

机构地区：[1]云南电网有限责任公司电力科学研究院,昆明650217 [2]西南交通大学电气工程学院,成都610031

出　　处：《电瓷避雷器》2016年第5期141-146,共6页Insulators and Surge Arresters

基　　金：中央高校基本科研业务费专项资金资助(编号:2682014CX022)

摘　　要：雷电流可分解为不同的频率分量,目前对于雷电流各频域范围与冲击响应电压之间的对应关系还缺乏相应的研究。在CDEGS中建立土壤电阻率500Ω·m下的100 m长水平接地体模型,利用MATLAB计算研究2.6/50μs雷电流中各频域范围对100 m长水平接地体的冲击电压幅值及幅值时间的影响,研究了将雷电流通过傅里叶变换分解为一系列的离散频率,计算接地极在各频率下的响应电压,再通过傅里叶反变换合成得到雷电流冲击响应电压波形的方法。并通过与CDEGS仿真的雷电流冲击响应电压波形对比分析,证明该方法可用于计算雷电流作用下接地极的冲击响应电压。研究发现雷电流不同频域范围对接地体冲击响应电压的影响不同：0～33 333 Hz频域对冲击电压幅值起增幅作用并且增幅程度最大;66 666～360 000 Hz的频域主要影响峰值电压出现的时间;586 667～910 000 Hz频域对冲击电压幅值起削弱作用,对冲击电压幅值时间影响较小;1 080 000 Hz之后频域主要产生毛刺谐波,此外还会削弱冲击电压的幅值。Lightning current can be decomposed into different frequency components, at present,the corresponding relation between the lightning current frequency range and the shock response voltage also lacks the corresponding research. Based on CDEGS, the 100 m long horizontal ground model of soil resistivity 500 Ω·m is established, the influence of the frequency domain range of 2.6/50 μs on the amplitude and time of the impulse voltage of the 100 m long horizontal grounding body is studied by using the MATLAB calculation, and by means of Fourier transform, the lightning current is decomposed into a series of discrete frequency,the response voltage of grounding electrode in each frequency is calculated, and then through the Fourier inverse transform, the method of synthesizing lightning current impulse response voltage waveform is obtained. Through comparison analysis with lightning current impulse response voltage waveform by CDEGS simulation, prove that the method can be used for calculation of lightning impulse response voltage of grounding electrode under lightning impulse current. It is found that： the frequency of 0～33 333 Hz mainly affects the amplitude of impulse voltage; the frequency of 63 333 ～360 000 Hz mainly affects the time of peak impulse voltage; the frequency of 586 667～910 000 Hz weakens the amplitude of impulse voltage; frequency of more than1 080 000 Hz mainly produces burr harmonic frequency and weakens the amplitude of impulse voltage.

关 键 词：雷电流 频域 冲击电压 接地体:MATLAB CDEGS 

分 类 号：TM862[电气工程—高电压与绝缘技术]