Abstract
The possible mechanism of lightning strokes to extra-high-voltage power transmission lines is discussed. It has been theoretically shown in the case of 1150 kV transmission lines that the interaction between the charges of a thunderstorm cloud and the downward leader from one side and the charges induced by them on the transmission line wires from the other side can cause swinging and dancing of the wires which leads to the possibility of disruptive discharges from the phase wire. Using a charged aerosol cloud it has been experimentally found that the appearence of discharges is accompanied with swinging of the wires. Some recommendations for lightning protection improvement are made.
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