Switching surge strength of large air gaps: A physical approach

Carrara, G.; Thione, L.

doi:10.1109/t-pas.1976.32131

Cited by 176 publications

(71 citation statements)

References 8 publications

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“…The lateral extension of this volume was defined by the downward and upward leader velocity ratio (taken as unity by Eriksson) and by the striking -inception -distance. This distance was estimated by using the critical radius concept [64] used to evaluate the condition for initiation of leaders in long sparks.…”

Section: Towards a Better Physical Understanding Of The Attachment Ofmentioning

confidence: 99%

“…It involves the iterative simulation of the propagation of both leaders based on electrostatic calculations. In this case, the leader initiation condition is also evaluated with the critical radius concept [64]. Both leaders are modeled by line charges and are assumed to approach with a relative velocity ratio equal to four immediately after the upward leader initiation and equal to one close to interception.…”

Section: Towards a Better Physical Understanding Of The Attachment Ofmentioning

confidence: 99%

“…Hence, the major improvements suggested by the CIGRE WG 33.01.03 for the further development of the leader propagation models are related to [72]: a. The physical evaluation of the inception of upward leaders: the calculation of the conditions required to initiate upward connecting leaders from grounded structures have been done based on leader inception methods derived for long air sparks [64,70]. However, there are doubts about the validity of these criteria when applied to evaluate the conditions of upward leader inception under natural lightning [73].…”

Section: The Context Of This Thesismentioning

confidence: 99%

“…The critical radius concept introduced by Carrara and Thione [64] and the generalized leader inception model of Rizk [70] are the main leader inception models proposed for laboratory long sparks.…”

Section: Existing Leader Inception Modelsmentioning

confidence: 99%

See 3 more Smart Citations

Attachment of lightning flashes to grounded structures

Becerra¹

2010

Lightning Protection

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Section: Towards a Better Physical Understanding Of The Attachment Ofmentioning

confidence: 99%

Section: Towards a Better Physical Understanding Of The Attachment Ofmentioning

confidence: 99%

Section: The Context Of This Thesismentioning

confidence: 99%

Section: Existing Leader Inception Modelsmentioning

confidence: 99%

See 2 more Smart Citations

Attachment of lightning flashes to grounded structures

Becerra¹

2010

Lightning Protection

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“…The critical radius concept was used as a leader inception criterion in lightning related studies by Eriksson, Dellera and Garbagnati, and D'Alessandro. The critical radius used was 0.36 m obtained by Carrara and Thione [9] and 0.28 m obtained by Bernardi et al [10] for a grounded rod between two parallel plates with a 500/6000 mu s waveform. The results of the experiment show that the critical radius concept as used today for lightning studies is strongly geometry dependent.…”

Section: Introductionmentioning

confidence: 99%

Determination of the striking distance of a lightning rod using finite element analysis

Bakar¹,

Abidin²,

Illias³

et al. 2016

Turk J Elec Eng & Comp Sci

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Abstract:The problems related to electromagnetic waves transmitted by lightning strikes can be studied through physical lightning models based on laboratory results. The main concern of these models is determining the striking distance between the leader tip and the lightning rod during lightning occurrences. The striking distance is a significant factor in designing the lightning protection system. However, models using finite element analysis (FEA) for this purpose are less likely to be found in the literature. Therefore, in this work, a geometry model of a lightning rod and leader was developed using available FEA software. The model was used to determine the striking distance for different lightning rod heights. The results obtained were compared with those of previous research using different methods to validate the models developed using FEA software. From the comparison, the striking distance obtained from the FEA software as a function of lightning rod height was in good agreement compared to other methods from previous research. The use of FEA software also enables the effect of different tip radii of curvature and shapes of the lightning rod on striking distance to be studied, which can further enhance our understanding of the relationship between striking distance and different rod parameters.

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A combined engineering model for the analysis of switching surge flashover characteristics of long air gaps

Nishijima

Kanekiyo

Asu

1992

Electrical Engineering Japan

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The flashover characteristics of long air gaps submitted to switching surge voltages may be predetermined by use of a mathematical model of leader propagation. The present model is developed from each combination of previous engineering models, and is also applied to positive rod‐to‐plane geometries with gap lengths up to 20 m. However, four parameters to determine leader propagation with respect to our model are adjusted in the present calculation so as to fit experimental flashover voltages and calculated flashover voltages which depend on waveforms of the applied voltage and gap length. The calculations show that these parameters are only a function of gap length. Our combined engineering model using parameters that depend on gap length allows the flashover characteristics of long air gaps to be easily determined with a microcomputer.

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Switching surge strength of large air gaps: A physical approach

Cited by 176 publications

References 8 publications

Attachment of lightning flashes to grounded structures

Attachment of lightning flashes to grounded structures

Determination of the striking distance of a lightning rod using finite element analysis

A combined engineering model for the analysis of switching surge flashover characteristics of long air gaps

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