Channel charge density behind commonly used return stroke engineering model

Zhang, Qi; Shi, Lihua; Chen, Hailin; Qiu, Shi

doi:10.1016/j.epsr.2022.108109

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…The channel base current (CBC) plays an important role in understanding lightning physical mechanisms. CBC is also of significant importance in lightning protection due to the fact that the characteristics, such as the temporal and spatial variations associated with current development in the lightning channel, can be used to derive and test return‐stroke (RS) models (Rakov & Uman, 1998; Q. Zhang et al., 2022). However, little CBC of natural lightning is documented due to its randomness and instantaneity.…”

Section: Introductionmentioning

confidence: 99%

Applying High‐Speed Video Images to Inverse Channel Base Current Based on NARX Neural Network

Zhang,

Luo,

Shi

et al. 2024

Earth and Space Science

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The high‐speed video (HSV) images were taken as the input data of the nonlinear autoregressive network (NARX) to reconstruct the return‐stroke channel base current (CBC). The integrated luminosity (IL) of discharge channel is firstly obtained by summing the pixel values in HSV images, and the correlation between the IL and CBC is analyzed as well. Then, a NARX model is trained by taking the IL and CBC as the input and output data, respectively. With the input of the IL of another discharge channel, the trained NARX model is applied to inverse the corresponding CBC. The inversed result suggests that the proposed method can be used to infer the CBC that was not yet measured.

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Section: Introductionmentioning

confidence: 99%

Applying High‐Speed Video Images to Inverse Channel Base Current Based on NARX Neural Network

Zhang,

Luo,

Shi

et al. 2024

Earth and Space Science

Self Cite

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“…There are many return stroke model types in the literature. These models can be classified into gas dynamic models (or physics based models), Electromagnetic models, waveguide models, transmission line models, and engineering models [14][15][16][17]. Due to their simplicity and their ability to successfully reproduce the salient features of the lightning electromagnetic pulse (LEMP), return stroke models belonging to the engineering model type are frequently used in practical studies.…”

Section: Introductionmentioning

confidence: 99%

Exact Expressions for Lightning Electromagnetic Fields: Application to the Rusck Field-to-Transmission Line Coupling Model

Cooray

Cooray²,

Rubinstein

et al. 2023

Atmosphere

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An exact analytical expression for the electric field of the return stroke as excited by a propagating step current source is derived in this paper. This expression could be advantageously used to evaluate the disturbances caused by lightning on overhead lines. There are three equivalent procedures to evaluate the voltages induced by lightning on power lines, namely, the Agrawal–Price–Gurbaxani model, the Taylor–Satterwhite–Harrison model, and the Rachidi model. In the case of a vertical return stroke channel, the coupling model developed by Rusck becomes identical to these three coupling models. Due to its simplicity, the Rusck model is frequently used by engineers to study the effects of lightning on power distribution and transmission lines. In order to reduce the time involved in the electromagnetic field calculation, the Rusck model is incorporated with an analytical expression for the electromagnetic fields of the return stroke excited by a propagating step current pulse. Our research work shows that the Rusck expression can be used to calculate the peak values of lightning induced voltages to an accuracy of about 10%. However, the use of this analytical expression to calculate the time derivatives of lightning induced voltages may result in errors as large as 50%. The derived expression in this paper can be used to correct for this inaccuracy. We also provide an exact expression for the electric field at any given point in space when the propagating current is an impulse function. This expression can be combined with the convolution integral to obtain the electric field corresponding to waveforms similar to measured return stroke currents.

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Measurement of Currents Induced on Overhead Line From Very Close Natural and Triggered Lightning

Luo

Zhang

Shi

2023

IEEE Trans. Electromagn. Compat.

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Channel charge density behind commonly used return stroke engineering model

Cited by 3 publications

References 22 publications

Applying High‐Speed Video Images to Inverse Channel Base Current Based on NARX Neural Network

Applying High‐Speed Video Images to Inverse Channel Base Current Based on NARX Neural Network

Exact Expressions for Lightning Electromagnetic Fields: Application to the Rusck Field-to-Transmission Line Coupling Model

Measurement of Currents Induced on Overhead Line From Very Close Natural and Triggered Lightning

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