A new model based on electro-geometrical theory for estimating the lightning protection zones

Machidon, Dragoş; Istrate, Marcel

doi:10.1109/atee.2013.6563470

Cited by 4 publications

(4 citation statements)

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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%

“…For extra and ultra high voltage transmission lines, a lightning shielding failure with low current amplitude may not necessarily lead to an insulation flashover. The minimum or critical current Ic (kA) required for flashover occurrence can be evaluated by equation (7).…”

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confidence: 99%

“…where: CFO is the critical impulse flashover voltage meaning the crest value of the impulse wave which causes flashover through the surrounding medium in 50% of the cases this impulse voltage was applied; Zsurge is the surge impedance of phase conductor under presence of corona. The critical current value (7) is required for the calculation of shielding failure flashover rate (SFFOR) characterizing an overhead power line with respect to the annual number of lightning shielding failures which leads to insulation flashover given per 100 km and defined by the following expression [4].…”

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confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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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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“…The rolling sphere method was slightly improved with the development of the elliptic model [4], [5], which considers the variation of the striking distance depending on the object to be strucked by lightning (earth or other earthed objects). Based on these aspects a new methodology for calculating the lightning protection zones was proposed in [6], and a comparative analysis between the results proposed by the rolling sphere method and the elliptic model was conducted in [7], revealing that the elliptic model provides slightly larger protection zones.…”

Section: Introductionmentioning

confidence: 99%

Implementation of the attractive radius method for the estimation of the lightning protection zones for a 110 kV power substation

Dragos-Lucian

Istrate

2014

2014 International Conference and Exposition on Electrical and Power Engineering (EPE)

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Lightning strokes are one of the most disturbing phenomena when it comes of worldwide power systems reliability. Rolling sphere method (RSM) is widely used for dimensioning the lightning rod protective system of power substations. Although very used, this methodology was developed on the base of the late '60 electrogeometrical theory, which neglects some important parameters related to the lightning orientation process. With the development of the leader progression theory a new methodology for calculating the lightning protection zones emerged, known as the attractive radius method. In this paper this new methodology is used in order to estimate the lightning protection zones for a typical 110 kV power substation of Romanian's national power grid. The obtained results are compared with those proposed by the rolling sphere method.

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Experimental and Electromagnetic Field Approach for the Development of Modified Building Protection System

Ullah

Baharom

Ahmad

et al. 2019

J. Electr. Eng. Technol.

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A new model based on electro-geometrical theory for estimating the lightning protection zones

Cited by 4 publications

References 4 publications

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

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

Implementation of the attractive radius method for the estimation of the lightning protection zones for a 110 kV power substation

Experimental and Electromagnetic Field Approach for the Development of Modified Building Protection System

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