ONE MATHEMATIC EQUATION FOR ASSESSMENT OF MAXIMUM LIGHTNING OVERVOLTAGE ALONG A CABLE

Lightning is a factor of producing overvoltages in transmission lines especially cable lines. In this paper, we have used forward and backward voltage waves algorithm for assessment of maximum lightning overvoltage along a cable. Maximum overvoltage has been calculated as function of surge impedance of overhead line connected to cable, cable surge impedance and its length. Finally, a mathematic equation for assessment of maximum overvoltage has been evaluated.