冰凌针-板间隙直流正极性下起始电晕特性的研究

覆冰是电力系统的严重自然灾害之一。覆冰绝缘子伞裙间隙未桥接时,冰凌尖端的放电是影响绝缘子闪络电压的主要因素之一。选择冰柱-冰板间隙模型,借助于紫外线成像仪等设备,在人工气候室内研究了冰凌-冰板模型的电晕特性,提出了用紫外线成像仪确定冰凌-冰板起晕电压的方法, 分析了影响冰凌起晕电压的因素。结果表明:冰凌-冰板间隙起晕电压与冰凌状态有关,湿冰的起晕电压较低,干冰的起晕电压较高;间隙较长,起晕电压较高;气压较低,起晕电压较低;冰凌起晕电压与覆冰水电导率没有明显关系。

Research on Initial Corona Characteristics of Icicle to Ice-Covered Plane Model under Positive Polarity

Icing is one of the serious natural disasters in power system. The discharge at the top of icicle is one of the main factors influencing flashover voltage when the air gap amid the sheds of ice-covered insulators is not bridged. Using icicle to ice-covered plane model and by means of ultraviolet imaging instrument, the corona characteristics of icicle to ice-covered plane model is researched in artificial climate chamber. A method to determine corona inception voltage of icicle to ice-covered plane model by ultraviolet imaging instrument is proposed and the factors influencing the corona inception voltage of icicle are analyzed. Research result shows that the corona inception voltage of air gap amid the icicle to ice-covered plane model depends on the state of icicle, the corona inception voltage is lower under wet icicle and that is higher under dry icicle; the corona inception voltage is higher under longer air gap; the corona inception voltage is lower under lower atmospheric pressure; the corona inception voltage does not depend on the water conductivity of icicle.