Hollow porcelain insulators in substations are frequently confronted with rain flashovers under extreme rainfall. This study aims to investigate the spatial and temporal variation of electric fields between hollow porcelain insulator sheds affected by dynamic deformation of pendant water drops and effects of the dimensionless number of fluids, the Weber number (We) and the electric Bond number (Bo_E), on it for influencing factors' analysis. Flow-electric field coupling simulations were carried out to compute the magnitude and the position of AC electric fields between the sheds. The results show that the maximum electric field at a point in time (E_tmax) increases significantly after the breakup of the pendant water drop, and its position alters accordingly. For low We and Bo_E, the global maximum electric field (E_gmax) increases with increasing We and Bo_E, respectively. It is much closer to the adjacent sheds and occurs later than E_tmax at the breakup of the pendant water drop (E_bmax). By contrast, E_gmax decreases in different degrees at high We and Bo_E, respectively. There is little difference between E_gmax and E_bmax in the position and the occurring time. The influence mechanism on the maximum electric field and discharges and the relationship between discharges induced by the pendant water drop and rain flashover are discussed.

中文翻译：

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极端降雨下悬垂水滴动态变形对空心瓷绝缘子棚间电场的影响

变电站中的空心瓷绝缘子在极端降雨下经常面临雨闪。本研究旨在研究悬垂水滴动态变形对空心瓷绝缘子伞裙间电场时空变化的影响，以及流体无量纲数、韦伯数（We）和电键数（Bo _E）的影响。 ，对其进行影响因素分析。进行流电场耦合模拟以计算棚屋之间交流电场的大小和位置。结果表明，在某个时间点的最大电场（E _tmax) 悬垂水滴破裂后显着增加，其位置也相应改变。对于低We和Bo _E，全局最大电场 ( E _gmax ) 分别随着We和Bo _E的增加而增加。它更靠近相邻的棚屋，发生时间晚于悬垂水滴破裂时的E _tmax ( E _bmax )。相比之下，E _gmax在高We和Bo _E分别有不同程度的下降。E _gmax差别不大和E _bmax的位置和发生时间。讨论了悬垂水滴引起的最大电场和放电的影响机理以及与雨闪的关系。