Evaluation of Lightning Return Stroke Current Using Measured Electromagnetic Fields

Abstract

Abstract-The lightning return stroke current is an important parameter for considering the effect of lightning on power lines. In this study, a numerical method is proposed to evaluate the return stroke current based on measured electromagnetic fields at an observation point in the time domain. The proposed method considers all field components and the full wave shape of the current without the use of a special current model as a basic assumption compared to previous methods. Furthermore, the proposed algorithm is validated using measured fields obtained from a triggered lightning experiment. The results show a good agreement between the simulated field based on the evaluated currents from the proposed method and the corresponding measured field at a remote observation point. The proposed method can determine current wave shapes related to a greater number of lightning occurrences compared to the direct measurement of the current.

Evaluation of Electromagnetic Fields Due to Inclined Lightning Channel in Presence of Ground Reflection

“…The return stroke current along a lightning channel can be considered in two areas, i.e., the channel base and at different heights above the surface of the ground whereby they can be modelled by current functions and current models, respectively [10,11]. In this paper, the sum of two Heidler functions and the general form of the engineering current model are used as expressed by Equations (1) and (2), respectively [10][11][12][13][14][15][16].…”

“…In this paper, the sum of two Heidler functions and the general form of the engineering current model are used as expressed by Equations (1) and (2), respectively [10][11][12][13][14][15][16]. It should be mentioned that the ground reflection is ignored in Equation (2).…”

On the Lightning Induced Voltage Along Overhead Power Distribution Line

“…(5) to (8) can support the different current functions in Table 1 by superposition of the electric fields due to the two fundamental equations, namely Eqs. (1) and (2)[10, [35][36].…”

Considering on the Ground Reflection Effect on the Electromagnetic Fields due to Lightning Channel

“…The electromagnetic fields associated with a lightning channel can be effective on the lightning induced voltage on the power lines [1-3] whereas they are more dependent on the current wave shapes at different heights along the lightning channel and also a number of channel parameters and geometrical factors [4][5][6][7]. Several studies have been undertaken to evaluate the electromagnetic fields due to a lightning channel.…”