科研之友
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摘要
The introduction of additional leakage distance is one of the key factors to improve the flashover voltage of contaminated insulators. Many researchers have been addressed the improved methods by optimizing insulator parameters, such as leakage distance and profile, diameter, form factor. Accurately predicting the flashover voltage for polluted insulators is a persistent research problem. Based on Obenaus-Rizk model, a generic mathematical model of flashover voltage for polluted insulators is established. The influence of contamination degree, arc constants and geometrical parameters for insulator with a simple shape (leakage distance, form factor and diameter) on the critical flashover voltage and flashover voltage gradient along leakage distance is analysed. Combined the differentia of the arc development and the effectiveness of leakage distance, a modified mathematical model for polluted insulator with complex shapes is developed. The agreement of the proposed model results with the actual measurements is verified based on the experimental data. The model can satisfy the engineering demand, and the error of all results is within 10%. It provides academic reference for the design, running and maintenance of insulator anti-polluting flashover.
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单位重庆大学
