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A Physical Model for Inception and Propagation of Upward Lightning Leader from a 1200 kV AC Power Transmission Line

Devadiga, Anurag A and Thomas, Joy M (2014) A Physical Model for Inception and Propagation of Upward Lightning Leader from a 1200 kV AC Power Transmission Line. In: International Conference on Lightning Protection (ICLP), OCT 11-18, 2014, Tsinghua Univ, Shanghai, PEOPLES R CHINA, pp. 215-219.

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UHV power transmission lines have high probability of shielding failure due to their higher height, larger exposure area and high operating voltage. Lightning upward leader inception and propagation is an integral part of lightning shielding failure analysis and need to be studied in detail. In this paper a model for lightning attachment has been proposed based on the present knowledge of lightning physics. Leader inception is modeled based on the corona charge present near the conductor region and the propagation model is based on the correlation between the lightning induced voltage on the conductor and the drop along the upward leader channel. The inception model developed is compared with previous inception models and the results obtained using the present and previous models are comparable. Lightning striking distances (final jump) for various return stroke current were computed for different conductor heights. The computed striking distance values showed good correlation with the values calculated using the equation proposed by the IEEE working group for the applicable conductor heights of up to 8 m. The model is applied to a 1200 kV AC power transmission line and inception of the upward leader is analyzed for this configuration.

Item Type: Conference Proceedings
Publisher: IEEE
Additional Information: Copy right for this article belongs to the IEEE,345 E 47TH ST, NEW YORK, NY 10017 USA
Keywords: Lightning; Lightning striking distance; Upward leader inception; Transmission line
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 03 Sep 2015 06:34
Last Modified: 03 Sep 2015 06:34
URI: http://eprints.iisc.ac.in/id/eprint/52303

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