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A model to represent negative and positive lightning first strokes with connecting leaders
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.
2004 (English)In: Journal of Electrostatics, ISSN 0304-3886, E-ISSN 1873-5738, Vol. 60, no 2-4, 97-109 p.Article in journal (Refereed) Published
Abstract [en]

A channel base current model of the current generation (CG) type is introduced to describe both negative and positive first return strokes. The key feature of the model is the association of the slow front of the channel base current waveform with the upward connecting leader. This feature is mathematically represented by a discharge propagation speed profile, which is characterized by an initial exponential increase with increasing height. It is shown that the previous models of the CG type may be incapable of reproducing adequately the observed electromagnetic fields when the channel base current contains a slow front.

Place, publisher, year, edition, pages
2004. Vol. 60, no 2-4, 97-109 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-93861DOI: 10.1016/j.elstat.2004.01.016OAI: oai:DiVA.org:uu-93861DiVA: diva2:167484
Available from: 2005-12-16 Created: 2005-12-16 Last updated: 2017-12-14Bibliographically approved
In thesis
1. The Effects of Lightning on Low Voltage Power Networks
Open this publication in new window or tab >>The Effects of Lightning on Low Voltage Power Networks
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The present society is highly dependant on complex electronics systems, which have a low damage threshold level. Therefore, there is a high risk of partial or total loss of the system’s electronics when they are exposed to a thunderstorm environment. This calls for a deep understanding on the mechanism related to the interaction of lightning generated electromagnetic fields with various large distributed/scattered systems. To accurately represent the interaction of lightning electromagnetic fields with electrical networks, it is necessary to have return stroke models capable to reproduce the electromagnetic field signatures generated by a lightning flash. Several models have been developed in the recent past to study the field-to-wire coupling mechanism. The most popular, simple and accurate among the available models is the Agrawal et al. model. On the other hand, ATP-EMTP is a well-known transient simulation package widely used by power engineers. This package has various built-in line models like Semlyen, Marti and Noda setups. There is a difficulty in applying the Agrawal et al. model with the built-in line models of ATP-EMTP, as the voltage source due to the horizontal component of electric field in Agrawal et al. model is in series with the line impedance and not in between two transmission line segments. Furthermore, when the electromagnetic field is propagating over a finite conducting ground plane, the soil will selectively attenuate the high frequency content of the electromagnetic field; causing a change in the field wave shape. A finite conducting ground will also produce a horizontal field component at the ground level. Several approximations are available in the literature to obtain the horizontal electric field; namely the wave-tilt and the Cooray-Rubinstein approximation. Consequently, it is important to investigate the change on the induced voltage signature when the power line is located over a finitely conducting ground. Additionally, to provide protection from lightning induced transients it is necessary to use Surge Protective Devices (SPDs) capable of diverting the incoming transients and provide protection level necessary to avoid damage in the equipment. However, standard test procedures of the SPDs do not take into account sub-microsecond structure of the transients. Therefore, to provide the required protection level to sensitive equipments connected to the low voltage power network, it is essential to understand the response of SPDs subjected to high current derivative impulses. This thesis is aimed to investigate the research problems as addressed above. Special attention will be given to a new proposed return stroke model, a simple circuit approach for efficient implementation of Agrawal et al. model using ATP-EMTP, the effect of the soil conductivity on the lightning induced overvoltage signatures and the response of surge protective devices subjected to high current derivative impulses.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. xviii + 89 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 131
Keyword
Electrical engineering, Lightning induced effects, Lightning Electromagnetic fields, Electromagnetic Compatibility (EMC), Surge Protective Devices (SPDs), Low voltage power networks, Elektroteknik, elektronik och fotonik
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-6236 (URN)91-554-6424-6 (ISBN)
Public defence
2006-01-12, Siegbahnsalen, The Ångstrom Laboratory, Polacksbacken, Lägerhyddsvägen 1, Uppsala, 13:15
Opponent
Supervisors
Available from: 2005-12-16 Created: 2005-12-16Bibliographically approved

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