Due to their outstanding anti-flashover characteristics,composite insulators have been extensively applied in power systems.A lot of research has investigated flashover characteristics of hydrophobic specimens with ar...Due to their outstanding anti-flashover characteristics,composite insulators have been extensively applied in power systems.A lot of research has investigated flashover characteristics of hydrophobic specimens with artificial water droplets.However,the phenomenon is not consistent with that of the contaminated composite insulators.On the test specimens covered with water droplets,there is no obvious leakage current before the flashover and no obvious relationship between flashover voltage and the conductivity of water droplets.On the contaminated composite insulator surface,there are short continuous arcs on the insulators before critical flashover,making insulators look like a luminous lantern.Considering that under these two conditions,the proportion of water along the insulation distance is different,the flashover characteristic of“dry band-water band”on a hydrophobicity surface is analyzed in the present study.The influence of the water band parameter(including length,width,and conductivity)as well as the length of dry band is studied.On this basis,the arc generation and development process of the surface covered with“dry band-water band”is analyzed.The research results improve the understanding of the flashover process on contaminated composite insulators.展开更多
Nowadays,end fitting corrosion reduces the mechanical strength and flashover voltage of insulators,forming a huge threat to high‐voltage direct current transmission lines.At present,the parameters of electrolytic cor...Nowadays,end fitting corrosion reduces the mechanical strength and flashover voltage of insulators,forming a huge threat to high‐voltage direct current transmission lines.At present,the parameters of electrolytic corrosion inhibition measures are selected based on the premise of the constant annual corrosion rate.However,with the development of corrosion,corrosion products accumulate on the insulator surface,which may impact the corrosion rate.In order to clarify the influence of corrosion products,this work studied how corrosion products influence the corrosion rate from the corrosion phenomenon,corrosion current,feature and formation of corrosion products.The results showed that corrosion products of iron and zinc were excellent in adhesion on the insulator surface and could not be cleaned by rain,which was able to increase the corrosion rate.In future,in the selection of the quality of the zinc ring bonded on insulator fittings,there will be a demand to consider the influence of corrosion products on the corrosion rate.展开更多
基金supported by the National Natural Science Foundation of China(NO.51977118)。
文摘Due to their outstanding anti-flashover characteristics,composite insulators have been extensively applied in power systems.A lot of research has investigated flashover characteristics of hydrophobic specimens with artificial water droplets.However,the phenomenon is not consistent with that of the contaminated composite insulators.On the test specimens covered with water droplets,there is no obvious leakage current before the flashover and no obvious relationship between flashover voltage and the conductivity of water droplets.On the contaminated composite insulator surface,there are short continuous arcs on the insulators before critical flashover,making insulators look like a luminous lantern.Considering that under these two conditions,the proportion of water along the insulation distance is different,the flashover characteristic of“dry band-water band”on a hydrophobicity surface is analyzed in the present study.The influence of the water band parameter(including length,width,and conductivity)as well as the length of dry band is studied.On this basis,the arc generation and development process of the surface covered with“dry band-water band”is analyzed.The research results improve the understanding of the flashover process on contaminated composite insulators.
基金supported by the Young Innovative Talents in Higher Education of Guangdong(NO.6020210025K).
文摘Nowadays,end fitting corrosion reduces the mechanical strength and flashover voltage of insulators,forming a huge threat to high‐voltage direct current transmission lines.At present,the parameters of electrolytic corrosion inhibition measures are selected based on the premise of the constant annual corrosion rate.However,with the development of corrosion,corrosion products accumulate on the insulator surface,which may impact the corrosion rate.In order to clarify the influence of corrosion products,this work studied how corrosion products influence the corrosion rate from the corrosion phenomenon,corrosion current,feature and formation of corrosion products.The results showed that corrosion products of iron and zinc were excellent in adhesion on the insulator surface and could not be cleaned by rain,which was able to increase the corrosion rate.In future,in the selection of the quality of the zinc ring bonded on insulator fittings,there will be a demand to consider the influence of corrosion products on the corrosion rate.
