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An Engineering Model for Transient Analysis of Grounding System Under Lightning Strikes: Nonuniform Transmission-Line Approach
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Division for Electricity and Lightning Research.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Division for Electricity and Lightning Research.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Division for Electricity and Lightning Research.
2005 (English)In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, 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 fails to predict the same. Unlike the circuit theory approach , 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 , . 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]
Electromagnetic Compatibility, EMC, Lightning Protection
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-92144DOI: 10.1109/TPWRD.2004.843437OAI: oai:DiVA.org:uu-92144DiVA: diva2:165116
Available from: 2004-10-12 Created: 2004-10-12 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Transient Response of Grounding Systems Caused by Lightning: Modelling and Experiments
Open this publication in new window or tab >>Transient Response of Grounding Systems Caused by Lightning: Modelling and Experiments
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In order to achieve better lightning protection and electromagnetic compatibility (EMC) requirements, the needs for a proper grounding system and the knowledge of its transient behaviour become crucial.

The present work is focused towards developing engineering models for transient analysis of grounding system with sufficient accuracy and simplicity for lightning studies. Firstly, the conventional uniform transmission line approach for a single grounding conductor is modified and extended to grounding grids. Secondly, in order to overcome the drawbacks of all the existing transmission line approaches, for the first time, a non-uniform transmission line approach is developed for modelling the transient behaviour of different types of grounding systems. The important feature of such an approach is in its capability to include the electromagnetic couplings between different parts of the grounding system using space and time dependent per-unit length parameters.

High voltages and currents induced in the grounding systems due to lightning always produce ionization in the soil. This phenomenon should be included during the transient analysis of grounding systems. In the present work, an improved soil ionization model including residual resistivity in ionization region is developed. The fact that there exists residual resistivity in ionization region (7 % of the original soil resistivity) can be proved by the experiments reported in the literature and the experiments carried out at the high voltage lab of Uppsala University. The advantage of including residual resistivity is that the beneficial influence of soil ionization in reducing the potential rise of grounding system will not be overestimated, especially in high resistivity soil.

Finally, the transmission line approaches are adopted for studying the response of grounding systems due to lightning for different applications. These are, influence of soil parameters on the transient behaviour of grounding systems, transient analysis of grounding structures in stratified soils, investigation of the validity of existing definitions for effective length/area of different grounding structures, current distribution in the shields of under ground cables associated with communication tower, and influence of insulator flashover and soil ionization around the pole footing on surge propagation in Swedish railway system.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 89 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 1015
Keyword
Electrical engineering, Grounding system, Lightning protection, Electromagnetic Compatibility, Transient analysis, Soil ionization, Transmission line approach, Elektroteknik
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-4556 (URN)91-554-6041-0 (ISBN)
Public defence
2004-11-04, Häggsalen, Ångströmlaboratoriet, Lägerhyddsv. 1, Uppsala, 10:15
Opponent
Supervisors
Available from: 2004-10-12 Created: 2004-10-12 Last updated: 2011-01-20Bibliographically approved

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