Effect of shielding by trees on the frequency of lightning strokes to power lines

Mousa, A.M.; Srivastava, K. D.

doi:10.1109/61.4311

Cited by 49 publications

(22 citation statements)

References 3 publications

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“…It is possible that normally used lightning protection models based on electrogeometric methods (used specifically for the case of trees by [27]) can be problematic when the conditions are non-ideal. The struck trees were often not the highest; in some cases there were high grounded buildings nearby which should in principle have been more likely to get struck.…”

Section: Discussionmentioning

confidence: 99%

Attachment of Natural Lightning Flashes to Trees: Preliminary Statistical Characteristics

Mäkelä¹,

Karvinen²,

Porjo³

et al. 2009

JLR

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Lightning attachment to trees was studied based on 37 trees that were struck in Finland in summer 2007 and 2008. The type and severity of lightning damage was correlated with multiple parameters related to the flash, the meteorological characteristics of the strike time, and the surroundings of the tree. Damage was classified into three categories: bark-loss (minor), wood-loss (extensive), end explosive (complete loss of tree material). Four statistically significant parameters were found. The absolute value of the peak flash current is strongly correlated with damage; also, an indirect argument suggests that positive flashes cause more damage than negative flashes. The amount of damage is inversely correlated with the rainfall in the previous three hours, indicating that a wet ground and tree surface protect trees against damage by providing a conducting path to the ground. The ground type also has a weaker statistically significant effect, with poorly conducting ground leading to more extensive damage. Old and rotten trees are statistically most likely to experience explosive damage. Other parameters are inconclusive. The distribution of tree heights points to the possibility that the electrogeometric method does not necessarily predict the strike probability to a given tree. In many cases, the struck trees were clearly within the protective radius of a higher structure, although this is often difficult to determine from photographs. It is therefore suggested that models of lightning flashes to trees should include both the conductivity and height of the tree. The results may be significant for remote prediction of lightning damage, as well as for understanding lightning protection of structures which include trees.

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Section: Discussionmentioning

confidence: 99%

Attachment of Natural Lightning Flashes to Trees: Preliminary Statistical Characteristics

Mäkelä¹,

Karvinen²,

Porjo³

et al. 2009

JLR

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“…It must be mentioned that adjacent towers and structures affect the shielding failure rates N SF , as quantitatively shown by analytical models [26] and probabilistic estimation methods [10]. Taking into account this effect the shielding failures present a lower value but the estimation method becomes more complex and restrictive to every tower.…”

Section: Flashover Rate Of a Transmission Linementioning

confidence: 98%

An optimal design method for improving the lightning performance of overhead high voltage transmission lines

Ekonomou

Iracleous

Gonos

et al. 2006

Electric Power Systems Research

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“…The electrogeometric model (EGM) is used to study and analyze the lightning strike to the transmission lines by using striking distance formulas [1][2][3][4][5][6]. The EGM defines the striking distance of the downward lightning leader to an object as a function of the lightning leader current, I (in kA), as [4][5][6] r s D al b ;…”

Section: Introductionmentioning

confidence: 99%

Analysis of Lightning-attractive Areas Around High-voltage Direct Current Transmission Line

Nayel

2009

Electric Power Components and Systems

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This article studies attractive areas around high-voltage direct current transmission lines due to downward lightning leader presence. The lightning-attractive areas are drawn for power conductors and shielding wires separately to distinguish the shielding failure area. An electromagnetic model is constructed to draw the attractive areas of the high-voltage direct current transmission lines. The transmission line conductors and the downward lightning leader are modeled by using the charge simulation method. Different cases of surrounding conditions, such as lightning slope, ground slope, and wind, are studied for the same downward lightning current. The attractive areas are affected by considering the high-voltage direct current transmission line voltage. As the downward lightning leader charge is negative, the attractive area around the high-voltage direct current transmission line power conductors increases around positive pole subconductors and decreases around negative pole subconductors. The high-voltage direct current transmission line shielding the failure area of the studied cases is increased or decreased due to the surrounding conditions.

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Effect of shielding by trees on the frequency of lightning strokes to power lines

Cited by 49 publications

References 3 publications

Attachment of Natural Lightning Flashes to Trees: Preliminary Statistical Characteristics

Attachment of Natural Lightning Flashes to Trees: Preliminary Statistical Characteristics

An optimal design method for improving the lightning performance of overhead high voltage transmission lines

Analysis of Lightning-attractive Areas Around High-voltage Direct Current Transmission Line

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