Lightning strike direct effects

Murphy, Adrian

doi:10.1016/b978-0-08-102679-3.00018-6

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…A high factor of a power outage due to lightning has also been reported in some countries [1]. Despite recent progress in the area of overvoltage protection, current statistical data that has been used around the world show that lightning activity remains the dominant factor affecting the overhead failure rate [2][3][4][5][6]. Analyzing the basic causes of failures in power networks based on the data presented in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The failure rate of the other elements is about the same. The analyses can be divided into several categories: theoretical studies based on simplified analytical formulas [3,5,9,10], computer simulations based on the finite element method [11][12][13][14]. The results of the analysis of some models indicate that the impact on the level of overvoltages has wire location and grounding parameters [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Bulletin of the Polish Academy of Sciences: Technical Sciences

Borecki,

Ciuba,

Kharchenko

et al. 2020

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The effectiveness of lightning protection on the power and distribution grid is a significant factor, which influences the power distribution reliability and the failure rate of system elements. As part of this article, a mathematical model will be presented, taking into account selected parameters that affect the assessment of the lightning hazard of an overhead line. The proposed model will consider the location of the object near the line and the adjustment of line conductor overhangs. Moreover, the mentioned mathematical model allows for analyzing the impact of considered parameters on the protection level of the power system, and transient overvoltages that occur in this system. The article contains also a detailed description of an effective and fast method to assess the lightning discharge impact on the power system with insufficient data. The introduced model was tested to verify the correctness of its operation by comparison of calculation results and functional data. High convergence of calculated and functional data and uncomplicated model structure ensure a wide range of applications for the proposed solution to easily prevent emergency situations in the power system. Furthermore, the described model gives the opportunity to assess the reduction of the range of selectivity zone associated with the power line, in conjunction with the impact of constructional peculiarities and a near object.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Borecki,

Ciuba,

Kharchenko

et al. 2020

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“…Simulation literature has therefore interpreted the real physical test conditions appropriate for the simulation type. In a realistic strike scenario, lightning current will have a point of entry and a remote point of exit [31]. This creates specific local conditions in which current will flow predominantly in the direction of the exit via the path of least resistance [31].…”

mentioning

confidence: 99%

“…In a realistic strike scenario, lightning current will have a point of entry and a remote point of exit [31]. This creates specific local conditions in which current will flow predominantly in the direction of the exit via the path of least resistance [31]. Thus, specimen experimental boundary conditions in a laboratory (where specimens are typically <1 m in length) do not necessarily represent those in a real aircraft (where panels can be >1 m in length).…”

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confidence: 99%

The Influence of Carbon Fiber Composite Specimen Design Parameters on Artificial Lightning Strike Current Dissipation and Material Thermal Damage

Millen¹,

Kumar²,

Murphy³

2023

SAE Int. J. Aerosp.

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<div>Previous artificial lightning strike direct effect research has examined a broad range of specimen design parameters. No works have studied how such specimen design parameters and electrical boundary conditions impact the dissipation of electric current flow through individual plies. This article assesses the influence of carbon fiber composite specimen design parameters (design parameters = specimen size, shape, and stacking sequence) and electrical boundary conditions on the dissipation of current and the spread of damage resulting from Joule heating. Thermal-electric finite element (FE) modelling is used and laboratory scale (<1 m long) and aircraft scale (>1 m long) models are generated in which laminated ply current dissipation is predicted, considering a fixed artificial lightning current waveform. The simulation results establish a positive correlation between the current exiting the specimen from a given ply and the amount of thermal damage in that ply. The results also establish that the distance to ground, from the strike location to the zero potential boundary conditions (ground), is the controlling factor which dictates the electric current dissipation in each ply. Significantly, this distance to ground is dependent on each of the specimen shape, dimensions, stacking sequence, and location of ground boundary conditions. Therefore, it is not possible to decouple current dissipation and damage from specimen design and boundary condition setup. However, it is possible to define a specimen size for a given specimen shape, stacking sequence, and waveform which limit the influence of specimen dimensions on the resulting current distribution and damage. For a rectangular specimen design which appears in literature multiple times, as 100 × 150 mm and with a stacking sequence of [45/0/−45/90]<sub>4s</sub>, a specimen design of greater than 300 × 200 mm is required to limit the influence of specimen dimensions on current distribution and damage.</div>

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