Analysis of the Effect of Surface Configuration on the Collision Characteristics of Transmission Conductor Icing
Conductor icing seriously affects the safety of power grid operation,the local collision coefficient is a key indicator to characterize the growth rate of transmission conductor ice cover,the traditional steel core aluminum stranded wire or its simplified cylindrical model of the growth of the ice cover characteristics of the previous analysis,the aluminum conductor composite core(ACCC),as a new type of conductor that is developing rapidly,the local collision coefficient and the growth process of the ice cover has rarely been studied.First realized the numerical simulation of ice cover growth based on the commercial finite element software Fluent,and verified the validity of the simulation method by comparing with the simulated test results.Subsequently,using the validated numerical simulation method,a comparative study of the ice cover growth characteristics of the ACCC refined model and the simplified circular conductor model was carried out to simulate the distribution of droplet collision coefficients on the surfaces of the two,and the effects of different median diameters of the raindrops and the change of the wind speed on the collision coefficients were discussed,and the icing ice shapes of the ACCC model were obtained.The results show that:the local collision coefficient of ACCC model is significantly smaller than that of round model when the wind speed is low,at the early stage of ice-covering,the ice shape is very significantly affected by the surface configuration of conductor,when the surface of conductor is completely wrapped by the ice-covering,the resistance coefficient of the round model is 15.3%lower than that of the ice shape of ACCC model as a whole,and it shows galloping instability under each wind attack angles.The results of the study are valuable for obtaining the growth characteristics of ACCC ice cover and understanding the disaster mechanism of ice cover on conductors with different surface configurations.
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