The Study About AC Flashover Characteristic Of The Acid Wet Sedimentation Defilement Insulators

According to many new problems on polluted flashover fault of power system in recent years, this paper analyzed the acid pollution performance of air environment and then drew several conclusions. At first, this paper pointed that acid wet sedimentation (acid rain, acid fog) was the important reason resulting in the AC polluted flashover on transmission lines to select leakage distance in traditional way. Secondly, conductance ? of polluted layer on the surface of insulator increases as PH value decreases and when PH value is less than 4, the value of ? will increase sharply.Moreover, this article based on that the tested insulators are porcelain insulators and composite insulators to test, mainly and systematically studied the AC polluted flashover characteristics of the clear or polluted porcelain insulators and Composite Insulators in the environment of acid wet sedimentation. And based on the lots of tests and circuit model, the paper analyzed the influence of acid wet sedimentation on the physics process of polluted flashover. The results of researches offer base to select outdoor insulation in the environment of acid wet sedimentation in Lanzhou. And it got the magnitude economy benefit to adopt the results in works to protect from polluted flashover.Studied results of this paper provided the scientific fundament to select the outdoor insulation and to protect power equipment from polluted flashover. By largely testing and theoretical analysis, this paper acquires creationary result. Under acid rain and fog condition, the results put forward the measure of preventing from polluting flashover and enhance the reliability of power system. It is provided with great influence and practical significance to scientific advancement.