Special case of lightning strike to Tall Objects on Ground

Raysaha, Rosy Balaram and Kumar, Udaya and Cooray, Vernon and Thottappillil, Rajeev (2017) Special case of lightning strike to Tall Objects on Ground. In: 30th International Conference on Lightning Protection, ICLP 2010, 13-17 September 2010, Cagliari, pp. 1-10.

PDF ICLP_2010 .pdf - Published Version Restricted to Registered users only Download (1MB) | Request a copy

Abstract

Analysis of lightning strike to Tall Grounded Objects (TGOs) is of practical importance. Actual measurements on TGOs have shown the presence of reflected current waves originating from either ends of TGO. With regard to the channel dynamics for these waves, there seems to be some uncertainties like: (i) will there be any reflection when these waves approach the wavefront, (ii) what would be their final status on the channel etc. The present work makes an attempt to address these issues using a macroscopic physical model for the lightning return stroke. Results show that waves transmitted from TGO on to the channel approaches the wavefront with higher velocity except near the wavefront. In fact, it gets attenuated and merges with the wavefront without any sign of reflection whatsoever. Both, the non-linear channel dynamics at the wavefront and corona sheath are responsible for this phenomenon. Incidentally, the simulation results also indicate a double initial peaking in the far field, significant reflection at the ground end of TGO and some noticeable induction to TGO well before the arrival of wavefront.

Item Type:	Conference Paper
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the Institute of Electrical and Electronics Engineers Inc.
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	06 Jun 2022 06:48
Last Modified:	06 Jun 2022 06:48
URI:	https://eprints.iisc.ac.in/id/eprint/73241

Actions (login required)

View Item