Effects of dynamic deformation of pendant water drops on the electric field between hollow porcelain insulator sheds under extreme rainfall

High voltage

article

Yijie Sun¹  Lin Yang¹  Gaofeng Shang¹  Zhiqiang Kuang¹  Yifan Liao¹  Yanpeng Hao¹  Licheng Li¹ 

[1] School of Electric Power, South China University of Technology;College of Advanced Interdisciplinary Studies, National University of Defense Technology

关键词: dynamic deformation;    electric field;    hollow porcelain insulators;    pendant water drop;    rain flashover;   

DOI  :  10.1049/hve2.12133

学科分类：物理（综合）

来源: Wiley

【 摘 要 】

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.

【 授权许可】

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