导线污秽对高压直流输电线路电晕特性的影响

高压直流架空线路导线表面附着的污秽物质会影响线路的电晕特性,而目前我国采用的线路电晕对环境影响的经验公式只考虑了导线表面场强和线路结构,为此利用1.6 m×1.6 m小电晕笼进行直流线路导线涂污实验,导线外径2.4 cm,使用3种成分的状态的干燥涂污。实验结果表明,在±500 kV高压直流线路表面场强附近,污秽物质使得离子电流和正极性导线可听噪声显著增加。导线电晕特性与污秽物质的成分密切相关,且有明显的极性效应。结合电晕图像和电晕脉冲测量数据,解释了涂污导线电晕特性变化的原因,并对下一阶段的研究工作予以展望。

Influence of Contaminations of the Conductor on HVDC Transmission Line Corona Characteristics

The contaminations adhering to the surface of HVDC overhead transmission line affect the conductor corona characteristics.The artificial pollution experiments of DC transmission line were carried out in a small corona cage,and experimental parameters were selected in the second section.The experimental results reveal that the contaminations on the conductor surface can increase the ion current and the audible noise of positive polarity conductor obviously under the electric field of HVDC 500 kV transmission line.Corona characteristics change with different contaminations' components,and the polarity effect is obvious.Factors that affect the corona characteristics of contaminated conductor are illustrated combined with corona photographs and measurement datum of the corona pulse.The next-phase research is introduced in the last section.