| Abstract [eng] |
This master's thesis investigates overvoltage processes caused by lightning discharges and switching operations in 110 kV overhead power transmission lines. Different types of overvoltages, their impact on the power grid, and potential protection devices are reviewed. Surge arresters are analyzed – their characteristics, selection of installation locations, and impact on the insulation of power transmission line equipment. The object of the study is a high-voltage 110 kV overhead line and its equipment, subjected to lightning overvoltages. Modeling of the overhead line and transformer substation is performed in the Electromagnetic Transients Program (EMTP) environment. Using the EMTP software package, lightning strikes to the overhead line and substation are simulated, determining overvoltage amplitudes and duration under different conditions. The most optimal parameters and installation location of surge arresters in the substation are determined. |
