Title :
Effect of electrical test methods on dc flashover performance of ice-covered ceramic insulators
Author :
Xingliang Jiang ; Bingbing Dong ; Zhijin Zhang ; Jianlin Hu ; Qin Hu ; Lichun Shu ; Yin, F.H.
Author_Institution :
State Key Lab. of Power Transm. Equip. & Syst. Security & New Technol., Chongqing Univ., Chongqing, China
Abstract :
In artificial icing tests, three test methods are frequently used for evaluating the electrical characteristic of ice-covered insulator strings, they are: average flashover voltage method (AM), 50% withstand voltage method (WM) and minimum flashover voltage method (MM). Based on measurements of DC flashover characteristics of ice-covered porcelain and glass suspension insulators in an artificial climate chamber, this paper studied the influences of various test methods on DC flashover voltage of insulators. Test results revealed that the average flashover voltage (Uave obtained using AM) is the highest, followed by the 50% withstand voltage (U50% obtained using WM). The minimum flashover voltage (Ufmin obtained using MM) is the lowest. The fitting formulas between DC flashover voltage (Uf) and conductivity of the icing water (γ20) are consistent for the three test methods. Moreover, the differences on exponent b characterizing the influence of conductivity of the icing water (γ20) on the flashover voltages are not remarkably different for the three electrical evaluation methods.
Keywords :
ceramic insulation; flashover; porcelain insulators; artificial climate chamber; artificial icing tests; average flashover voltage method; dc flashover performance; electrical test; glass suspension insulators; ice-covered ceramic insulators; ice-covered insulator strings; ice-covered porcelain; icing water; minimum flashover voltage method; withstand voltage method; Conductivity; Flashover; Ice; Insulators; Meteorology; Porcelain; Voltage measurement; DC; Ice-covered insulators; electrical test method; flashover characteristics; flashover voltage; icing water conductivity;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2013.6518944