摘要
根据2006年夏季在山东滨州地区的一次火箭引雷试验观测中雷电流和地电位升高的资料,对雷电作用于伸长接地体上引起的地电位升高和接地电阻特性进行分析。从波形可以看出,雷电过程中有两次回击,一次峰值为41.59kA,时间参数为6.02/20.24μs,另一次峰值为29.59kA,时间参数为4.8/11μs。以往对接地体的冲击特性研究都是限于试验室中的标准波形,此次试验反映出真实雷电过程中接地体的接地电阻变化特性。同时采用ATP仿真法计算出水平接地体在雷电流下的冲击接地电阻,与实际情况进行比较。结果显示,仿真计算结果不随雷电流波形参数发生变化。雷电流和地电位升高波形峰值存在时间差,仿真中不能体现这一特点。
In this paper one experiment ofartificiaUy trigged lightning in binzhou, shandong province in the summer in 2006 is described. The data of the experiment, including the lightning current and the ground potential rise, and the variation of the ground potential rise and the grounding resistance on the grounding electrode is analysed. From the waveform of the lightning current, it can be found that the process of the flash has two return-strokes. The parameter of one return-stroke with the amplitude of41.59kA is 6.02/20.24μ s, the parameter of the other with the amplitude of 29.59kA is 4.8/11μs. The former studise on impulse ground resistance which are based on taboratory experiment always limited, for only the standard impulse current instead of the factual circumstance can be prouided. Transient grounding resistance （TGR） in the return-strokes including two small return-strokes is obtained. Besides, ATP Simulation is used to calculate the impulse grounding resistance, which is compared with the factual circumstance. Between the impulse peak value and voltage peak value there is time difference, however, the difference can not be founded in the simulation, which means the front time Tfand time to half value Tt is identical.
出处
《华中电力》
2008年第3期5-8,共4页
Central China Electric Power
关键词
人工引雷
地电位升高
接地电阻
接地体
雷电流
artificially trigged lightning
ground potential rise
grounding resistance
grounding electrode
lightning current
