直流电压下冰棱尖端放电实验研究(英文)

Experimental Study on Discharge From an Icicle Tip Under DC Voltage

由于冰凌尖端和覆冰绝缘子表面之间的放电情况与覆冰绝缘子闪络电压紧密相关而引起了高度的关注,在冰凌和冰板模型基础上,通过实验研究了直流情况下冰凌尖端电晕放电现象。研究结果发现:冰凌到覆冰绝缘子表面间距、环境温度、冰水电导率对起晕电压有一定的影响,其影响原因也被逐一分析;揭示了电晕放电发展过程,在不同电压极性下,电晕放电对冰凌尖端的影响不同;当环境温度为?5℃,不同电压极性下冰凌尖端起晕电压与普通电极情况不一致,这种情况希望得到更多的证实。研究结果将会提升对覆冰绝缘子放电的理解,并有助于防止闪络情况的发生。

Electric discharge between the tip of an icicle and a plane electrode has been studied because of its relevance to the flashover voltage of ice-covered insulators. Using an icicle/iced-plate system, the corona discharge at the icicle tip was investigated under DC voltage. The influence of different parameters such as gap distance, temperature and water conductivity on the corona inception voltage （Ui~） was examined and analyzed. The corona discharge process was depicted and the influence of the corona discharge on the icicle tip was illustrated. A novel discharge characteristics under the icicle tip was found that Uinc under DC＋ voltage is lower than that under DC- voltage while the environmental temperature is -5 ~C, which differs to that under the metal electrode, and needs to be verified further. All results will improve the understanding on discharge activities under atmospheric icing and prevent the further flashover occurrence.