Abstract
In this paper by creating a three dimensional model for clouds, towers, wires and a perfectly-conducting ground a dynamic environment is prepared for simulating lightning attachment to high voltage transmission line structures. The downward lightning leader approaches the earth in each simulation step, and a stable upward leader inception from ground structures test points are tracked until finding ultimate stroke target. Main computational volume is occupied by field calculation which is done using charge simulation method. The inception of stable upward leader is scrutinized through one simplified physical model taking into account the leader-streamer system of connecting leader. The percent of strokes which attaches the phase wires, ground wires and towers as well as shielding angle effect on line performance is simulated and shown. The procedure for using graphs for selecting proper shielding angle is also presented.
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