交流污闪电弧动态特征探究

Dynamic Characters Exploring of Flashover Arc for AC Contaminated Insulators

通过将污闪电弧模型化,并结合有关污闪试验结论和物理学说,详细讨论了在交流冲击下,污闪电弧的动态特征。绘制了起弧、电弧延伸、临界态、电弧收缩、熄弧各状态之间的电弧状态发展轨迹,将径向延伸和“电容效应”引入了电弧动态方程。从而揭示了电弧发展过程中有关状态量的变化趋势和特征,并针对有关结论做了必要的解释和验证。结果表明:电弧的延伸和收缩状态轨迹不是重合的,考虑弧径延伸和“电容效应”能够弥补现有模型的不足。这对于进一步研究污闪机理,建立更加科学合理的污闪模型具有参考价值。

Dynamic characters of flashover arc from contaminated insulators under AC impulse was studied through arc modeling and correlative theory based on artificial test and physics doctrine. Transitional trace of arc states during flashover development such as arc appearing, extending, getting critical state, shrinking, and distinguishing was built and radial prolongation and capacitance effect was introduced into existing dynamic model of flashover. On the base of works above, some dynamic rules of arc with flashover developing were discovered, interpreted and validated. The result shows that state-developing traces are not overlapped in arc extending and shrinking course; Radial prolongation and capacitance effect developed in this paper can enrich the existing model, which are helpful for advanced studying and modeling of flashover in the future.