水滴或污秽对导线电晕放电起始特性的影响

Corona Inception Discharge Characteristics of Conductor Adhered with Water Drops or Pollution

导线电晕放电会引起能量损失、无线电干扰、可听噪声等危害。为了研究输电线路导线在淋雨或积污情况下的电晕放电特性,借助紫外线成像仪等设备,在电晕笼内进行了导线表面有水滴或污秽时的电晕放电起始特性的研究,主要包括水滴的数量及不同的污秽度对导线电晕放电起始特性的影响。结果表明:导线表面有一滴水或两滴水时,电晕起始放电要依次经历由"水滴的不稳定性"所引起的不稳定电晕、水滴周围气体的电离所致的稳定电晕放电、导线全面电晕放电3个阶段;导线表面水滴的稳定起晕电压随导线表面水滴的增多而减小;导线表面布满水滴或均匀涂刷污秽时起晕过程较为平缓,难以判断起晕的各个阶段;导线的电晕放电起始特性与导线表面污秽的盐密和灰密没有明显的关系。

Corona on conductor will cause some harms such as energy loss, radio disturbance, audio noise and so on. Corona discharge will be more serious when the transmission line is in rainy or polluted environment. Studies in home and abroad have not involved this aspect so far. With the aid of an ultraviolet imaging instrument, corona in ception characteristics of conductor adhered with water drops or pollution are studied in the corona cage. The effect of the number of water drops and pollution density on corona inception characteristics is emphatically researched. The result shows that corona inception Will experience three processes when the conductor is adhered with one or two water drops on the surface. Steady corona inception voltage of water drops will obviously reduce as the quantity of the water drops increases. The start of corona is obscure when water drops or pollution cover all over the conductor surface, so corona inception process is difficult to determine. The relation between corona inception characteristics and pollution density is not obvious.