Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/24332
Title: A 3-d self-organized leader propagation model and its engineering approximation for lightning protection analysis
Authors: Xu, Y
Chen, M 
Keywords: Electrostatic processes
Lightning protection
Stepped leader modeling
Striking distance
Issue Date: 2013
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on power delivery, 2013, v. 28, no. 4, 6595145, p. 2342-2355 How to cite?
Journal: IEEE transactions on power delivery 
Abstract: This paper presents a 3-D self-organized model of a downward stepped leader in negative cloud-to-ground lightning. In the model, the characteristic features of stepped leaders are generalized, so that parameters, such as the charge density along with the leader channel, leader corona sheath radius, leader step length, step time interval, and step advance speed, are calculated. Stepwise growth of the 3-D leader channel is developed stochastically. Parameters predicted by the model are qualitatively compatible with observation results, while the engineering approximation of the model for convenient lightning protection analysis is derived thereafter. The model is operated under various conditions at different leader initiation heights and electric potentials. Based on statistics of the simulation results, analytical relationships between the height and potential of leader initiation in the cloud and the charge distribution along the leader channel are approximated. Moreover, the lightning striking distance to flat ground is defined and calculated. Depending on the present model, the striking distance is found to be well associated with the charge density (or electrical potential) of the leader tip near to ground rather than the total charge in the leader channel. Based on appropriate physical understanding, the striking distance is connected to the return stroke peak current.
URI: http://hdl.handle.net/10397/24332
ISSN: 0885-8977
EISSN: 1937-4208
DOI: 10.1109/TPWRD.2013.2263846
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