Research On Ice Shedding From 220kV-Double-Circle Transmission Line In Heavy Icing Area

The harsh natural environment in the western region,especially the thick ice and high altitude makes corridor resource become more prominent.Nowadays the lower voltage level transmission lines are designed to be single-circle,which consumes large amounts of corridor resource and brings great technical difficulty and high cost of construction to the later stages of construction,so there is an urgent need to adopt double-circle design in western region.In summary,it will explore new ideas for our future design of transmission line in heavy region to carry out the ice shedding research of 200 kV double-circle AC transmission line in heavy icing and high altitude region.Besides,it provides technical support and greatly reduces the construction cost,which has significant economic benefits.In this paper,the finite element method is used to study the transmission line ice shedding.The form-finding on cables is completed by means of using a method without iterative process,ice shedding form conductors is simulated by changing density,and then conductor-insulator model and tower-line system model are established respectively.Considering the ice removal rate and wind,six kinds of conditions are calculated and the comparative analysis is carried out.Combined with the actual situation of the transmission line,the tower-line system model is determined to use in this paper,.After taking the tower-line system model as the research model,the dynamic responses of ice shedding from transmission line with different parameters are simulated by means of the control variable method.The various parameters include ice removal rate,the number of spans,ice thick,type and length of the insulator,altitude difference and span length.The results show that with the increase of the ice removal rate or icing thickness or the length of the insulator,the jump height of the conductor increases.Except for the independent span,the number of spans has no influence on the jump height of the conductor.So is the altitude difference.Compared to the I-string,V-string can limit the jump height of the conductor to some extent,and it is more obvious that V-string can limit the horizontal displacement.Finally with the increase of span length,the jump height of the conductor increases first and then decreases.