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1) Find the magnitude of second voltage step occurring at the receiving end (Vr) using the Bewley lattice diagram if a rectangular wave voltage of 30 kV magnitude from infinite length is initiated in A and travels to the receiving end 2) A lightning stroke which reaches a peak current of 30kA in 1μS strikes a 25 m tower on a 275kV transmission line. The line has a ground wire joining the tops of the towers; its surge impedance is 500 Ω . The tower surge impedance is 120 Ω and the ground footing resistance is 60 Ω . Determine whether the line insulators will flashover as a consequence of the surge, assuming that their impulse flashover strength is 1050 kV. A coupling factor 0.3 with the phase conductor can be assumed; the impedance of the stroke channel can be ignored; a wave velocity on the tower of 2.98 x 10^8 m/s can be assumed. Show the surge progressions in the form of Bewley lattice diagram.
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