Lightning Channel-Base-Current Estimation Using Engineering Return-Stroke Models From Measured Magnetic Field Based on Deconvolution Method

2020 ◽  
Vol 62 (3) ◽  
pp. 798-806
Author(s):  
Gandi Ramarao ◽  
Kandasamy Chandrasekaran
Keyword(s):  
Magnetic Field ◽  
Deconvolution Method ◽  
Return Stroke ◽  
Base Current ◽  
Current Estimation ◽  
Lightning Channel ◽  
Stroke Models ◽  
Measured Magnetic Field

Corona current concept in lightning return-stroke models of engineering type

2010 ◽  
Vol 59 (3-4) ◽  
pp. 177-188
Author(s):  
Grzegorz Masłowski
Keyword(s):  
Lightning Discharge ◽  
Current Source ◽  
Current Concept ◽  
Relaxation Model ◽  
Charge Motion ◽  
Return Stroke ◽  
Corona Current ◽  
Lightning Channel ◽  
Stroke Models

Corona current concept in lightning return-stroke models of engineering typeA role of radial corona current in a lightning discharge is discussed in the paper. It is shown that the corona current concept previously introduced by Cooray for lightning return stroke models of distributed-current-source (DCS) type, and later, by Maslowski and Rakov for lumped-current-source (LCS) type models enables to show duality between these two types of models. Further, it is demonstrated that the corona current is useful during consideration of dynamics of the lightning-channel corona sheath. As an example of application of presented approach a relaxation model of charge motion in the corona sheath is analysed together with plots which show the rate of expansion and shrinkage of the lightning corona sheath on both microsecond and millisecond time scales.

scholarly journals Modified Transmission Line Model with a Current Attenuation Function Derived from the Lightning Radiation Field—MTLD Model

Atmosphere ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 249
Author(s):  
Vernon Cooray ◽  
Marcos Rubinstein ◽  
Farhad Rachidi
Keyword(s):  
Radiation Field ◽  
Electromagnetic Fields ◽  
Input Parameter ◽  
Inverse Transformation ◽  
Attenuation Curve ◽  
Return Stroke ◽  
Zero Crossing ◽  
Base Current ◽  
Stroke Models ◽  
A Current

In return strokes, the parameters that can be measured are the channel base current and the return stroke speed. For this reason, many return stroke models have been developed with these two parameters, among others, as inputs. Here, we concentrate on the current propagation type engineering return stroke models where the return stroke is represented by a current pulse propagating upwards along the leader channel. In the current propagation type return stroke models, in addition to the channel base current and the return stroke speed, the way in which the return stroke current attenuates along the return stroke channel is specified as an input parameter. The goal of this paper is to show that, within the confines of current propagation type models, once the channel base current and the return stroke speed are known, the measured radiation field can be used to evaluate how the return stroke current attenuates along the channel. After giving the mathematics necessary for this inverse transformation, the procedure is illustrated by extracting the current attenuation curve from the typical wave shape of the return stroke current and from the distant radiation field of subsequent return strokes. The derived attenuation curve is used to evaluate both the subsequent and first return stroke electromagnetic fields at different distances. It is shown that all the experimentally observed features can be reproduced by the derived attenuation curve, except for the subsidiary peak and long zero-crossing times. In order to obtain electromagnetic fields of subsequent return strokes that are in agreement with measurements, one has to incorporate the current dispersion into the model. In the case of first return strokes, both current dispersion and reduction in return stroke speed with height are needed to obtain the desired features.

scholarly journals Modeling of the Lightning Return Stroke Current at a Tall Structure Using the Derivative of the Heidler Function

2021 ◽  
Author(s):  
Kristofer Bitner
Keyword(s):  
Magnetic Field ◽  
Reflection Coefficient ◽  
Transmission Lines ◽  
Return Stroke ◽  
Frequency Dependent ◽  
Tall Structures ◽  
Alternative Approach ◽  
Tall Structure ◽  
Current Derivative ◽  
Measured Magnetic Field

Traditionally tall structures have been modeled as simple lossless transmission lines. This model is inadequate for the CN Tower, which may be modeled as a series of transmission lines with different characteristic impedances resulting in a reflection coefficient at each discontinuity. Analysis shows that these vary significantly and are related to the ratio of the current derivative peak to the current derivative 10%-90% risetime, suggesting that they are frequency dependent. The magnitude of the reflection from the return stroke front, if it does exist, is much smaller that was previously proposed. An alternative approach to modeling, based on modeling the current derivative, is proposed and it is found to provide a better match with the measured waveforms. The CN Tower is modeled as a series of uniform lossless transmission lines and the channel is represented by the MTLL model. The features of the measured magnetic field waveform are well reproduced.

scholarly journals Modeling of the Lightning Return Stroke Current at a Tall Structure Using the Derivative of the Heidler Function

2021 ◽  
Author(s):  
Kristofer Bitner
Keyword(s):  
Magnetic Field ◽  
Reflection Coefficient ◽  
Transmission Lines ◽  
Return Stroke ◽  
Frequency Dependent ◽  
Tall Structures ◽  
Alternative Approach ◽  
Tall Structure ◽  
Current Derivative ◽  
Measured Magnetic Field

Traditionally tall structures have been modeled as simple lossless transmission lines. This model is inadequate for the CN Tower, which may be modeled as a series of transmission lines with different characteristic impedances resulting in a reflection coefficient at each discontinuity. Analysis shows that these vary significantly and are related to the ratio of the current derivative peak to the current derivative 10%-90% risetime, suggesting that they are frequency dependent. The magnitude of the reflection from the return stroke front, if it does exist, is much smaller that was previously proposed. An alternative approach to modeling, based on modeling the current derivative, is proposed and it is found to provide a better match with the measured waveforms. The CN Tower is modeled as a series of uniform lossless transmission lines and the channel is represented by the MTLL model. The features of the measured magnetic field waveform are well reproduced.

scholarly journals Comparison of lightning return stroke channel-base current models with measured lightning current

2019 ◽  
Vol 8 (4) ◽  
Author(s):  
Chin-Leong Wooi ◽  
Zulkurnain Abul-Malek ◽  
Mohamad Nur Khairul Hafizi Rohani ◽  
Ahmad Muhyiddin Bin Yusof ◽  
Syahrun Nizam Md Arshad ◽  
...  
Keyword(s):  
Full Width Half Maximum ◽  
Electronic Systems ◽  
Stroke Model ◽  
Lightning Stroke ◽  
Return Stroke ◽  
Current Function ◽  
Base Current ◽  
Lightning Current ◽  
Lightning Channel ◽  
Good Agreement

Electromagnetic pulse radiation produced around the lightning stroke channel has caused the disturbance to the microelectronic industry, especially to disturbance of high frequency to electronic systems. Lightning channel-base current function (CBC) characteristics and parameters determine lightning electromagnetic field (LEMF) results obtained on the basis of the used models. This paper evaluated and compared the measured lightning current and six lightning current-based channels models namely Bruce and Golde, Heidler, Diendorfer and Uman, Nucci, Pierce and Cianos and new current-based current (NCBC) models. In terms of the waveshape, among all the six lightning channel-based current models discussed, the models developed by Javor, Nucci and Diendorfer and Uman have showed a good agreement compared to the measured lightning current. In terms of 10-90% risetime and full width half maximum time (FWHM) comparison, NCBC and Nucci models have showed compatible comparison. However, Nucci model is not easily adjustable to different desired pulse-current waveshapes. On the other hand, NCBC model can be simplified, the values of lightning peak current and risetime can be chosen arbitrarily and independently from other parameters, and there is no need for the peak-correction factor, so that reduces the number of parameters. Therefore, the NCBC model was suggested to be used in the future in order to simulate much accurate return stroke model. This knowledge will contribute to the development of a new accurate and efficient return stroke model.

Sign in / Sign up

Export Citation Format

Share Document