Study On Icing Degree Characterization Method Of Porcelain And Glass Insulators Based On Equivalent Model

Scientists have done a lot of research on icing insulator, yet there is no unified understanding about icing degree characterization of insulators. Different researches used different icing degree characterization parameter. Due to complex structure of insulator and different shape and distribution of ice on insulator, it cannot reflect the true state of ice by using conductor icing thickness, icicels number and average ice thickness. A unified standard was needed to characterize icing degree.In this paper, porcelain and glass insulator were chosen as study object. Natural icing tests conducted in Chongqing University Xuefeng Mount Natural Icing test Base to study natural icing growth characteristics of insulator. On the basis of collision efficiency, insulator's equivalent diameter was put forward. Equivalent model of insulator and the formula of ice mass of equivalent model were established. And natural icing tests and artificial icing tests were conducted to study equivalent model. Then icing tests on insulator under different environment parameters were conducted in Chongqing University small artificial climate chamber to study characterization method of using equivalent model's ice mass and equivalence between ice mass of insulator and ice mass of equivalent model. The main conclusions are as follows:(1) Under natural environment, icing morphology of porcelain and glass insulator is similar. There is obvious windward and leeward side. Icing at windward side is more serious. Icing at leeward side is less and ice distributes equably. There is also a small amount of ice on the surface of groove. Relationship between insulator ice mass and icing time is nonlinear. Insulators natural icing can be divided into first stage, medium stage and late stages. Icing of insulator is related to icing time, meteorological parameters and insulator structure. The higher wind speed and the lower the temperature is, the faster the ice growth on insulators is. For the same type of insulator, the greater insulators disc diameter is, the greater ice mass is.(2) Based on droplet collision efficiency, insulator has cylinder equivalent model. The diameter of cylinder is the equivalent diameter of insulator. The equivalent diameter of insulator is related to environment parameters. During natural icing test and artificial test, ice mass of insulator XP-70 and LXY-160 is linear to ice mass of equivalent model.(3) For insulator XP-70 and LXY-160, wind velocity and temperature have infulence on the equivalence of insulator's equivalent model. When wind velocity increases and temperature decreases, the average relative deviation of estimating insulator's ice mass with ice mass of equivalent model deciline. Infulence of wind velocity and temperature on the equivalence of insulator's equivalent model is related to the type of insulator.(4) Ice mass of insulator's equivalent model and ice mass of insulator can both characterize ice degree and there is equivalence between these two parameters.