Evaluation of Lightning Current and Velocity Profiles Along Lightning Channel Using Measured Magnetic Flux Density

Izadi, Mahdi; Kadir, Mohd Zainal Abidin Ab; Gomes, Chandima; Cooray, Vernon; Shoene, J.

doi:10.2528/pier12060612

Cited by 24 publications

(13 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be mentioned that the difference between the simulated field (based on ρ g = 0.1) and the corresponding measured field of that period can be due to inherent error of applied current model and also velocity profile along lightning channel, that is assumed as a constant value. In reality return stroke velocity is a height dependent variable [10,19].…”

Section: Resultsmentioning

confidence: 99%

“…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].…”

Section: Return Stroke Currentmentioning

confidence: 99%

“…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).…”

Section: Return Stroke Currentmentioning

confidence: 99%

See 2 more Smart Citations

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

Izadi¹,

Kadir²,

Hajikhani³

2013

PIER

Self Cite

View full text Add to dashboard Cite

Abstract-In this paper, analytical field expressions are proposed to determine the electromagnetic fields due to an inclined lightning channel in the presence of a ground reflection at the striking point. The proposed method can support different current functions and models directly in the time domain without the need to apply any extra conversions. A set of measured electromagnetic fields associated with an inclined lightning channel from a triggered lightning experiment is used to evaluate the proposed field expressions. The results indicate that the peak of the electromagnetic fields is dependent on the channel angle, the observation point angle as well as the value of the ground reflection factor due to the difference between channel and ground impedances. Likewise, the effect of the channel parameters and the ground reflection on the values of the electromagnetic fields is considered and the results are discussed accordingly.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Return Stroke Currentmentioning

confidence: 99%

See 1 more Smart Citation

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

Izadi¹,

Kadir²,

Hajikhani³

2013

PIER

Self Cite

View full text Add to dashboard Cite

show abstract

“…It should be mentioned that the widely used current models such as the Transmission Line model (TL), Modified Transmission line with Exponential Decay model (MTLE), Modified Transmission Line with Linear Decay model (MTLL) can all be expressed by substituting different functions instead of the P(z') term in Eq. (3) [33][34].…”

Section: Return Stroke Currentmentioning

confidence: 99%

On the Lightning Induced Voltage Along Overhead Power Distribution Line

Izadi¹,

Kadir²,

Hajikhani³

2014

Journal of Electrical Engineering and Technology

Self Cite

View full text Add to dashboard Cite

-Lightning induced voltage is a major factor that causes interruptions on distribution lines.In this paper, analytical expressions are proposed to evaluate a lightning induced voltage on power lines directly in the time domain without the need to apply any extra conversions. The proposed expressions can consider the widely used current functions and models in contrast to the earlier analytical expressions which had a number of limitations related to the simplification of the channel base current and the current along the lightning channel. The results show that the simulated values based on the proposed method are in good agreement with the previous studies and the proposed expressions can be used for optimizing the insulation and protection level of existing and new lines being designed.

show abstract

“…Grounding systems with various configurations of grounding electrodes is often a part of lightning protection systems [1][2][3][4][5][6][7][8][9][10][11]. Grounding system provides a channel that current passes by, and large current flows through the grounding system before dissipating in the ground when lightning strikes.…”

Section: Introductionmentioning

confidence: 99%

Optimal Programs to Reduce the Resistance of Grounding Systems

Xiong¹,

Chen²,

Gao³

et al. 2013

PIER

View full text Add to dashboard Cite

Abstract-In this paper, some optimal programs have been proposed through the analyses of transient grounding resistance (TGR) to reduce the grounding resistance using the finite-difference time-domain method. First, the TGR of various electrode types, lengths and sectional programs is studied, and it is found that a flat bar is the most financially efficient conductor to be used as grounding electrode. Enlarging grounding electrode length can reduce grounding resistance when it is shorter than the effective length, but the reduction effect declines as the length increases. Additionally, a series of small electrodes would lead to a much lower resistance than a single large one. Second, it is demonstrated that locally improving the soil near the grounding system is an efficient way of reducing the grounding resistance. Improving a limited area soil surrounding the lifting line would reduce the peak resistance significantly, while local enlarging electrodes surrounded soil conductivity can reduce the grounding system steady resistance obviously.

show abstract

Evaluation of Lightning Current and Velocity Profiles Along Lightning Channel Using Measured Magnetic Flux Density

Cited by 24 publications

References 43 publications

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

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

On the Lightning Induced Voltage Along Overhead Power Distribution Line

Optimal Programs to Reduce the Resistance of Grounding Systems

Contact Info

Product

Resources

About