FAST CALCULATION METHOD FOR LIGHTNING CURRENT ON THE OVERHEAD GROUND WIRE AND ASSESSMENT OF ITS IMPACT ON THE GROUNDING SYSTEM OF HIGH-VOLTAGE SUBSTATIONS
Keywords:
Dòng điện sét; dây chống sét; hệ thống nối đất; trạm biến áp cao thế; đường dây truyền tải.Abstract
When lightning strikes the overhead ground wire of a transmission line, part of the lightning current flows into the grounding system of the substation, affecting the ground potential and operational safety. This study proposes a fast method for calculating the lightning current flowing into the substation grounding system when lightning strikes at a specified location on the overhead ground wire. Based on transmission line theory, the system is represented by an equivalent electrical circuit to derive the corresponding calculation expressions. The proposed method simplifies the calculation process and reduces the time required to determine lightning current under different study conditions.
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