Estimation of positive polarity switching surge flashover voltage of compact transmission lines
Hill, Kenneth Harvey
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This project evaluates the electric field characteristics of air gaps occurring within the tower and insulation structure of a compact transmission line using ANSYS and estimates the flashover voltage and required clearances using an already established relationship between the flashover voltage and electric field characteristics. The first task in this project is to gather flashover data from publications and choose a procedure to correct all flashover data for weather conditions. The second task is to compile a list of air gaps (rod-plane, rod-rod, and conductor-window) and evaluate the gap factor, the ratio of the configuration flashover voltage to the rod-plane flashover voltage, for each configuration. The third task is to evaluate the electric field characteristics of each air gap configuration and extend the validity of the relationship between the flashover voltage and the electric field characteristics. This relationship between the electric field characteristics and the flashover voltage is then applied to a compact transmission line, which has already been tested and the flashover characteristics are known. Upon completion of this project, a procedure will be established to estimate the required clearances of air gaps in the preliminary design phase of a compact transmission line, by using a computer program such as ANSYS.