涂覆导线表面的淋雨电晕特性

Corona Performance of Coated Conductors Under Raining Condition

国内外虽然对输电线路的电晕特性进行了大量研究,但缺少对导线在结构固定情况下改善表面淋雨电晕特性的研究。为此,基于憎水性涂料可减少水滴在其涂层表面聚集从而减少导线覆冰的特性,在小型电晕笼里对涂敷不同憎水性涂料的导线进行了人工模拟淋雨电晕试验,并通过紫外成像仪进行了检测。试验结果表明:电力设备外绝缘用持久性就地成型防污闪复合(PRTV)涂料和超疏水涂料能够减少水滴在导线表面的附着;PRTV涂料可以降低水滴的首次破裂电压并提高水滴的首次喷射微滴电压;通过对比淋雨条件下无涂料导线和涂敷憎水性涂料导线的起晕电压可知,PRTV涂料和超疏水涂料均能够改善导线的电晕放电特性。因此,涂覆憎水性涂料的导线不仅具有常规的减少覆冰的效果,而且具有很好的降低电晕损耗的作用。

In recent years, scholars at home and abroad had mission lines, but seldomly studied how to improve the wire extensively researched the corona characteristics on trans- corona characteristics under the condition that conductor＇s structure remains unchanged, we considered the function of hydrophobic coating in antifouling flashover and ice preven- tion. In a small corona cage, artificially simulated rain corona experiments were carried out with different hydrophobic coating coated wires and an ultraviolet camera was used to detect the experiments. The experimental results show that the PRTV coating and super hydrophobic coating can reduce water drop＇s adhesion on the surface of the wire; PRTV coating can reduce the drop＇s breakdown voltage for the first time and raise the lowest injection voltage of it; By comparing in- ception voltages of clean wire and coated hydrophobic coating wire in the rain, the PRTV coating and super hydrophobic coating can improve the voltage discharge characteristic of the wire.