New experimental study on the DC flashover voltage of polymer insulators:combined effect of surface charges and air humidity
作者机构：Department of Electrical and Computer EngineeringUniversity of Manitoba75 Chancellor's CircleWinnipegManitobaCanada R3T 5V6 Manitoba HydroWinnipegManitobaCanada R3M 3T1
出 版 物：《High Voltage》 (高电压（英文）)
年 卷 期：2019年第4卷第4期
页 面：316-323页
核心收录：
学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：Manitoba Hydro Natural Sciences and Engineering Research Council of Canada, NSERC
摘 要：This research provides conclusions that can partially cover the lack of knowledge related to the effects of ambient atmospheric conditions on DC electric power *** polymer insulating materials are used for completing this research *** a climate chamber,the relative humidity is controlled and adjusted from 20%to 80%***,the samples are charged with positive or negative charges by applying±20 kV to the corona-generating ring of *** surface potential is measured using an electrostatic voltmeter and is converted into surface charge density later by applying the probe response matrix *** pre-charged samples are then stressed with high-voltage negative or positive DC values inside the climate chamber over a range of controlled values of the surrounding air humidity until flashover takes *** space charges,which can drift in the air gap to reach the solid surface,are highly affected by the level of the relative humidity of the surrounding ***,increasing humidity results in a reduction of the DC flashover inception voltage and a shorter time to flashover regardless of the voltage ***,the positive or negative flashover inception voltage of both materials increases with pre-deposited negative charges while it decreases with pre-deposited positive charges.
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