Overvoltages Caused by Direct Lightning Strokes
Tennessee Technological University
7.1 Direct Strokes to Unshielded Lines
7.2 Direct Strokes to Shielded Lines
7.4 Outage Rates by Direct Strokes
Unshielded Lines • Shielded Lines
7.5 Effects of Induction for Direct Strokes
7.6 Ground Impedance and Corona under Lightning
A lightning stroke is defined as a direct stroke if it hits either the tower or the shield wire or the phase conductor. This is illustrated in Figure 7.1. When the insulator string at a tower flashes over by direct hit either to the tower or to the shield wire along the span, it is called a backflash; if the insulator string flashes over ...
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