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,电流波形为6.02/20.24μs,另一次峰值为29.59kA,电流波形为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。同时针对ATP仿真法中常用的接地体仿真模型提出质疑,冲击接地电阻仿真计算结果不随雷电流波形参数发生变化,而且雷电流和地电位升高波形峰值不能体现出时间差,这是因为火花放电使冲击接地电阻非定值。
One experiment of artificially trigged lightning is described in Binzhou, Shandong Province during the summer in 2006. The experimental data are analyzed, including the lightning current and the grounding potential rise, and the variation of the grounding potential rise, and the grounding resistance on the ground electrode. 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 returnstroke with the amplitude of 41.59kA is 6.02/20.24μs, the parameter of the other with the amplitude of 29.59kA is 4.8/11μs. The previous study done by others on impulse grounding resistance is always limited in the laboratory, which can only provide the standard impulse current instead of the factual circumstance. Transient grounding resistance （TGR） in the return-strokes including two small returnstrokes is obtained. Some issues about the simulation model in ATP simulation are proposed.
出处
《现代电力》
2008年第5期25-29,共5页
Modern 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
grounding potential rise
grounding resistance
ground electrode
lightning current
