Calculation of interception efficiencies for air-terminations using a dynamic electro-geometrical model

Kern, Alexander; Schelthoff, Christof; Mathieu, Moritz

doi:10.1109/sipda.2011.6088439

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…Both SE and IE must have near 1.0 efficiency if damage probability is to be near zero. Tables 3,4 and 5 of Reference [1] gives the CIGRE data for the derivation of damage probability for LPL 1 to LPL 4. The derivation is reproduced in Table 1 below.…”

Section: Sizing and Interception Efficiencies Of The Lpsmentioning

confidence: 99%

“…The accuracy of the LPS interception efficiency estimate can be improved by carrying out probabilistic RSM evaluation of a typical LPS design. Reference [4] examined this by using a dynamic electro-geometric model (DEGM) in a probabilistic analysis to derive representative estimates of IE. The results for a finial-based LPS system is summarised in Table 2.…”

Section: Interception Efficiency Of Finialsmentioning

confidence: 99%

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The Impact of Direct Lightning Strike Damages on PV Modules in a Large Malaysian PV Farm

Lee¹,

Thum²

2022

TJIEM

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Many lightning risk analyses avoided considering the role of the PV Module’s aluminium frame as a natural lightning air termination system or if such a role is considered, assumed that the ‘thin’ aluminium frame, would not be damaged from metal melting and evaporation at the point of lightning stroke attachment. Although the IEC 62305 is not lacking in guidance on the use of thin metal sheets as air terminations, this aspect is not considered in PV farm design. To ensure correct inputs into the risk assessment calculation, the evaluation of interception and sizing efficiencies and the damage probabilities of the natural components have to be addressed. A comparative analysis is done between two types of air terminations; the PV-frame LPS and the finial-added LPS. The result indicates that for solar PV farms exceeding a certain size and operating in high ground flash density regions like Malaysia, the finial air termination may out-perform the PV-frame LPS.

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Section: Sizing and Interception Efficiencies Of The Lpsmentioning

confidence: 99%

Section: Interception Efficiency Of Finialsmentioning

confidence: 99%

The Impact of Direct Lightning Strike Damages on PV Modules in a Large Malaysian PV Farm

Lee¹,

Thum²

2022

TJIEM

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“…To estimate lightning shielding failure and possible shielding failure outage, the electro-geometric theory is the most widely used [4,5]. Various modifications to electro-geometric model such as dynamic electro-geometrical model [6] or elliptic model [7] are also used nowadays. One of a key component in the electro-geometric model concept and rolling sphere method is a striking distance or attractive radius of a lightning flash.…”

Section: Introductionmentioning

confidence: 99%

Overview of Factors Affecting the Estimation of Lightning Shielding Performance of Overhead Transmission Lines

Trotsenko,

Peretyatko,

Dixit

et al. 2023

ENERHETYKA: ekonomika, tekhnolohiyi, ekolohiya

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This paper examines the risk of lightning stroke to overhead transmission line. The estimation procedure for the lightning performance of overhead power lines is based on the selected lightning attachment model, available lightning parameter statistics, the transmission tower design and voltage levels, type of overvoltage and other characteristics. In this paper the overview of factors affecting the estimation of lightning shielding performance of overhead transmission lines was performed. Among the factors that can affect the estimation accuracy, one can list insufficiently accurate data on the ground flash density in the area of interest and lack of complete data on statistical distribution of lightning current magnitudes. The paper shows that the influence of wind on the increase in the horizontal exposed distance of the phase conductor is not also taken into account. In this research traditional electro-geometric model was used for estimation of lightning performance of 220 kV overhead power line. Results obtained suggest that swing of suspension insulator strings caused by strong winds may lead to increased risk of lightning shielding failure during thunderstorm. Calculation performed for 3 kA lightning current magnitude shows that at swing angle equal to –1 degree, the horizontal unprotected distance of phase conductor increases by 3.1%, that corresponds to 5.240 m uncovered width. When the swing angle is increased to –5 degree, the uncovered width is increased by 15.8% that corresponds to 5.885 m uncovered width. It is proposed that an increase in the risk of lightning shielding failure as a result of wind load can be accounted by applying an appropriate correction factor in expressions for calculation of shielding failure rate, shielding failure flashover rate, etc. Proposed correction factor should account frequency and strength of wind in the area of transmission line route and depend on transmission line voltage level and tower design. Further efforts should be focused on obtaining and justifying the numerical values of this correction factor.

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“…In windy conditions, phase conductors can swing violently and gallop, and as a result, can go beyond the protected volume. Nowadays, for estimation of lightning shielding failure and possible lightning outages of overhead power lines, electro-geometric model and its various modifications are widely used [7][8][9]. According to [8,10] observed number of lightning strokes to upper phase conductors of large-sized overhead transmission lines was larger than those obtained from computations based to conventional electro-geometric model.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, for estimation of lightning shielding failure and possible lightning outages of overhead power lines, electro-geometric model and its various modifications are widely used [7][8][9]. According to [8,10] observed number of lightning strokes to upper phase conductors of large-sized overhead transmission lines was larger than those obtained from computations based to conventional electro-geometric model. One of the explanations for this may be that some factors are not taken into account in the model.…”

Section: Introductionmentioning

confidence: 99%

Electricity Transmission and Environment: Effect of Wind Loads on Lightning Shielding Performance of Overhead Power Lines

Trotsenko¹,

Katsadze²,

Dixit³

et al. 2023

ENERHETYKA: ekonomika, tekhnolohiyi, ekolohiya

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In this paper the estimation of wind load effect on the lightning shielding performance of overhead power lines was performed. According to electro-geometrical model any phase conductor has horizontal exposure width where this conductor is not protected against lightning by the overhead ground wire. A typical double circuit 220 kV lattice power transmission line tower was considered. Obtained results demonstrate that in the presence of thundercloud in windy conditions unprotected distance of phase conductor may increase due to deflections of phase conductors. Geometric locations of the conductor attachment points on the suspension insulator string and the lower point of the conductor sagging were calculated in the range of wind pressure from 0 to 800 Pa. This allowed to determine the exposure width values of a 220 kV overhead power line upper phase conductor in the same range of wind pressure values. The results show that for a minimum lightning current of 3 kA, the unprotected distance increases by 4.323 times from 4.167 m to 18.013 m when the wind pressure increases from 0 to 800 Pa (from 0 to 36.140 m/s). For a minimum lightning current of 5 kA, the unprotected distance increases by 7.735 times from 2.825 m to 21.851 m when wind pressure and wind speed vary in the same range. Although the transmission line is reliably protected against lightning strikes with currents greater than 16 kA at wind pressure of up to 200 Pa (18.070 m/s), when the wind pressure increases from 300 Pa to 800 Pa (from 22.131 m/s to 36.140 m/s), the unprotected area increases from 4.752 m to 26.204 m. In Summary, the results show that the influence of wind load must be taken into account in the tasks of calculating lightning protection of overhead power lines. Further efforts should be focused on studying the lightning shielding performance of overhead power lines of higher voltage classes.

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Calculation of interception efficiencies for air-terminations using a dynamic electro-geometrical model

Cited by 11 publications

References 2 publications

The Impact of Direct Lightning Strike Damages on PV Modules in a Large Malaysian PV Farm

The Impact of Direct Lightning Strike Damages on PV Modules in a Large Malaysian PV Farm

Overview of Factors Affecting the Estimation of Lightning Shielding Performance of Overhead Transmission Lines

Electricity Transmission and Environment: Effect of Wind Loads on Lightning Shielding Performance of Overhead Power Lines

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