A New Approach To Estimation Of Effective Height Of Towers On Mountain Tops For Lightning Incidence Studies: Sensitivity Analysis
2009 (English)Conference paper (Other academic)
In this paper, we review and evaluate the definitions and methods that could be used to estimate the effective height of a given tower on mountaintop based on the statistical observations . We derive the effective heights based on Rizk’s lightning attachement model, which are less than those predicted by the earlier methods based on statistical observations. Then we perform sensitivity analysis to evaluate the effect of uncertainties in model parameters that influence the effective height. Variations in the effective height as a function of model parameters, including the final quasi-stationary leader gradient, minimum positive streamer gradient, upward connecting positive leader speed, and mountain base radius, are presented, with Gaisberg tower as the example. It’s found that the effective height depends primarily on the structre height, mountain shape and upward positive leader speed. This new approach presented here can be employed to estimate the effective height for towers for which no lightning incidence data needed for the earlier methods are available. And the information could be also used in designing lightning protection of communication/transmission line towers and masts on mountain tops.
Place, publisher, year, edition, pages
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-87605OAI: oai:DiVA.org:kth-87605DiVA: diva2:501793
The X International Symposium on Lightning Protection (SIPDA). Curitiba, Brazil. 9th-13th November, 2009
QC 201204262012-02-142012-02-142012-04-26Bibliographically approved