Expression for Calculation of Lightning Ground Flash Density for Conditions of India

Trotsenko, Yevgeniy; Dixit, Mandar; Mykhailenko, V.V.

doi:10.1109/mees52427.2021.9598780

2021 IEEE International Conference on Modern Electrical and Energy Systems (MEES) 2021

DOI: 10.1109/mees52427.2021.9598780

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Expression for Calculation of Lightning Ground Flash Density for Conditions of India

Yevgeniy Trotsenko

Mandar Dixit

V.V. Mykhailenko

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2023

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“…Since Ng is a fundamental parameter that underlies the procedures for calculating the expected number of lightning strikes to any structure, in order to improve the accuracy of the estimate, it is preferable to use not common expression (3), but regional ground flash density values. For example, in [13] it was derived that the ground flash density Ng for conditions of India can be calculated from the formula (5).…”

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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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mentioning

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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Expression for Calculation of Lightning Ground Flash Density for Conditions of India

Cited by 1 publication

References 3 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

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