| Autor: |
Udaya Kumar, Vernon Cooray, Rosy Balaram Raysaha, Rajeev Thottappillil |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
2010 30th International Conference on Lightning Protection (ICLP). |
| DOI: |
10.1109/iclp.2010.7845870 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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