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An engineering model for transient analysis of grounding system under lightning strikes: Nonuniform transmission-line approach
Uppsala University.
Uppsala University.
Uppsala University. (EMC)ORCID iD: 0000-0002-1607-2493
2005 (English)In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 0885-8877, Vol. 20, no 2, 722-730 p.Article in journal (Refereed) Published
Abstract [en]

A nonuniform transmission line approach is adopted in this paper for modeling the transient behavior of different types of grounding systems under lightning strikes in time domain by solving Telegrapher's equations based on finite-difference time-domain (FDTD) technique. Electromagnetic couplings between different parts of the grounding wires are included using effective per-unit length parameters (l, c, and g), which are space and time dependent. The present model can predict both the effective length and the transient voltage of grounding electrodes accurately, while, an uniform transmission line approach with electrode length dependent per-unit length parameters [19]-[22] fails to predict the same. Unlike the circuit theory approach [1]-[4], the present model is capable of predicting accurately the surge propagation delay in the large grounding system. The simulation results for buried horizontal wires and grounding grids based on the present model are in good agreement with that of the circuit and electromagnetic field approaches [3], [9]. From an engineering point of view, the model presented in this paper is sufficiently accurate, time efficient, and easy to apply.

Place, publisher, year, edition, pages
2005. Vol. 20, no 2, 722-730 p.
Keyword [en]
grounding, lightning, transient analysis, transmission line and finite-difference time-domain (FDTD) methods
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-62563DOI: 10.1109/TPWRD.2004.843437ISI: 000228095900025OAI: diva2:480625
QC 20120222Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2012-02-22Bibliographically approved

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Thottappillil, Rajeev
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