Abstract
Abstract To address the issue of induced voltage that may occur during the maintenance and repair of intersecting lines below ultra-high voltage ±800 kV DC transmission lines, which poses a threat to the safety of maintenance personnel, this paper analyzes the formation mechanism of induced voltage based on the principles of electrostatic fields. By modeling an actual ±800 kV transmission line and using EMTP simulation software, the variations in induced voltage were simulated under various factors such as voltage level, parallel line length, and soil resistivity. The simulation analysis results indicate that the electrostatic-induced voltage of DC lines increases with the voltage level, parallel running length, sag, soil resistivity, and the number of split conductors; it decreases with the increase of the distance from the center and the crossing angle; and it is essentially unaffected by the operating current. Therefore, the findings of this paper have significant practical value for the protection against induced voltage in future DC high-voltage transmission lines.
Published Version
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