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Analytical-numerical solution of electromagnetic equations for calculation lightning-induced voltage on overhead transmission line

Power transmission lines of low voltage are rarely damaged by direct lightning strikes, because they are short in length and are protected by high objects which surround them. However, the induced voltage generated by lightning indirect strikes, can cause significant damage to the power equipment and for the control or protection circuits. The paper presents the results of computer simulation the induced voltage on a single and lossless line located at a height from the ground with perfect conductivity. The induced voltage is generated by return stroke current that moves up through the lightning channel from the ground to the cloud. In this article, we solved electromagnetic equations for the line-field coupling model using of numerical method. Induced voltage calculation was performed for the various parameters of the lightning current and the overhead line. The amplitude and the shape of the induced voltage strongly depend on the return stroke current parameters (velocity, current of channel base discharge) and the distance to the overhead line.