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Effect of Icing on Insulator’s Surface on Flashover

Author: LiDi
Tutor: YangJiaXiang
School: Harbin University of Science and Technology
Course: High Voltage and Insulation Technology
Keywords: Iced Insulators Finite Element Method Electric field Dynamic model Flashover
CLC: TM216
Type: Master's thesis
Year: 2011
Downloads: 37
Quote: 0
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Abstract


The surface of the insulator in high voltage transmission lines Icing is one of the reasons causing the surface flashover , to greatly affect the operational reliability of the power grid . Therefore , it is necessary to study Iced Insulator Flashover characteristics . At present , the domestic research on Insulator Icing mostly concentrated in the field trials , Iced Insulator Flashover mechanism studied in this paper will provide a theoretical basis for engineering test . The use of the finite element method, set artificial boundary conditions , solving the 220kV electric field control equation Iced Insulators , high voltage insulator surface electric field and potential distribution and related physical parameters , as icicles length , continuous gap length , as well as iced status the surface flashover information . The results show that the Icing caused insulator surface electric field and the potential distribution of distortion , especially when the insulator sheds completely covered ice bridging , the electric field and the potential distortion ; same length Bingleng , void gap position is not the same , the electric field and the potential distortion degree different. The presence of the high conductivity of the water film in the surface of the ice cover , the ice approximate become equipotential further increase in the voltage drop across the gap gap . The emergence of the arc along the surface field Iced Insulators strong maximum arc of the first part , but the maximum value of the high-pressure end of the arc and the low-pressure end of the arc , and 41.5 kV cm and 17.5 kV cm , respectively . Iced Insulator AC and DC flashover discharge model based Obenaus concept , MATLAB as a computing platform to simulate the process of cross - DC voltage arc change over time . The numerical simulation results and the overlying ice flashover test results have a good consistency , and to verify the correctness of the model .

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CLC: > Industrial Technology > Electrotechnical > Electrical materials > Insulating materials,dielectric,and its products > Insulator and casing
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