荷电沙尘对棒-板短空气间隙工频击穿电压影响的试验研究

Experiment on Influence of Charged Dust on Power Frequency Breakdown Voltage of Rod-plate Short Air Gap

为研究真实风沙环境下带电沙尘对输电线路外绝缘特性的影响,基于固体颗粒荷电理论设计了一套沙尘荷电模拟试验系统,该系统包括风沙模拟装置、沙尘荷电装置以及棒-板间隙放电装置,可模拟真实的风沙环境。应用该系统研究了棒-板短空气间隙在风沙环境下荷电沙尘对间隙工频击穿电压的影响,对风速、风沙荷电、荷电极性等因素对棒-板空气间隙工频击穿电压的影响规律开展了试验研究,研究表明:风的作用会使棒-板间隙的击穿电压增大;沙尘以及沙尘荷电对棒-板间隙击穿电压的影响与间隙距离有关。

To study the influence of charged dust on the external insulation of transmission lines under the real windy and sandy environment, this paper applied charged solid particles in designing a simulation system of the real sandstorm, which consisted of sandstorm simulator, sand dust charger and rod-plate gap discharging device. This paper studied the influence of charged dust on the power frequency breakdown voltage of the rod-plate short air gap under the simulated sandstorm environment. Besides, the system also took into consideration wind speed, charge quantity, and polarity of charge as the factors that might affect the breakdown voltage. The results show that the breakdown voltage of rod-plate air gap increases under windy environment. However, whether it is affected by sand dust and charged dust depends on the gap distance.