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Sunday, May 10, 2020 | History

2 edition of Computation of electromagnetic fields radiated by lightning strikes to the Toronto CN Tower. found in the catalog.

Computation of electromagnetic fields radiated by lightning strikes to the Toronto CN Tower.

Radu Rusan

Computation of electromagnetic fields radiated by lightning strikes to the Toronto CN Tower.

by Radu Rusan

  • 70 Want to read
  • 27 Currently reading

Published by National Library of Canada in Ottawa .
Written in English


Edition Notes

Thesis (M.A.Sc.) -- University of Toronto, 1997.

SeriesCanadian theses = -- Thèses canadiennes
The Physical Object
Pagination2 microfiches : negative. --
ID Numbers
Open LibraryOL21330573M
ISBN 100612516091

Abstract: In order to protect electronic devices against the effects of lightning strikes to tall structures, detailed information about the lightning currents and the radiated electromagnetic fields are necessary. For this purpose, coordinated lightning current and field measurements are performed at the telecommunication tower on the mountain Hoher Peissenberg in the south of by: Electromagnetic field waveforms and current waveforms of lightning strokes to the CN Tower have been simultaneously measured since A new calculation model of electromagnetic field radiation is proposed. The proposed model consists of the lightning current propagation and distribution model and the electromagnetic field radiation model.

Abstract: Two different techniques (monopole and dipole) for calculating the electric and magnetic fields from a distribution of currents and charges are discussed. Both techniques have been used for calculating the fields from lightning. A simple lightning return stroke current model, consisting of a square current pulse traveling up a vertical antenna above a ground plane, is used to compare Cited by: CALCULATION OF LIGHTNING ELECTROMAGNETIC FIELDS: A REVIEW Rajeev Thottappillil (1) and Vladimir A. Rakov (2) (1)Division for Electricity and Lightning Research, Ångström Laboratory, Uppsala University, Uppsala, Sweden email: [email protected] (2)Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL , USA.

the very close electromagnetic fields [22]. -! Simultaneous measurements of return stroke current, the corresponding electric and magnetic fields at three distances associated with lightning strikes to the Toronto CN Tower were performed during the Summer of [23]. The data have been used to test. Rajeev Thottappillil Overview Electromagnetic fields from lightning can couple to electrical systems and produce transient overvoltages, which can cause power and telecommunication outages and destruction of electronics. Learn more about Chapter 5: Computation of Electromagnetic Fields from Lightning Discharge on GlobalSpec.


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Computation of electromagnetic fields radiated by lightning strikes to the Toronto CN Tower by Radu Rusan Download PDF EPUB FB2

Radiated Electric and Magnetic Fields Caused by Lightning Return Strokes to the Toronto CN Tower which is injected at the attachment point between the CN Tower and the Lightning Channel. as another novelty, computation of the electromagnetic field is accomplished in Cartesian Coordinates.

This fact permits to relax the requirement on Cited by: 2. COMPUTATION OF ELECTROMAGNETIC FIELDS RADUTED BY LIGHTNING STRiKES TO THE TORONTO CN TOWER Radu Rusrn A tbub rbmitted in confomity WW mquinieob for Ut dm of. 1*1 National Libraiy.,*na, Radiated electromagnetic fidd.

14 Vide0 sub8ystanr Cited by: 2. Chapter 3 is devoted to the computation of the electromagnetic field produced by lightning return strokes to elevated strike objects, using the extension of the engineering models to include an. Request PDF | 3-D FDTD Computation of Electromagnetic Fields Associated With Lightning Strikes to a Tower Climbed on a Trapezoidal Mountain | In this paper, we are interested in the study of.

Two propagation paths for the electromagnetic field to the first and to the second field measurement stations (located, respectively, km and km away from the CN Tower) were along the soil and through the Toronto city, whereas for the third location ( km away) the propagation path was nearly entirely across the fresh water of Lake by: This paper presents the results of a radiated electromagnetic field due to lightning strike to a tall tower sitting on a mountainous terrain when considering both the first and subsequent return.

Read "Computation of lightning electromagnetic field in the presence of a tall tower with the HYBRID method, COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Simulation results are performed for an observation point located 50 m from the base of the channel (or tower, when present) and for three cases, namely (i) a lightning strike to ground, and (ii.

A solution is presented for the electromagnetic fields radiated by an arbitrarily oriented current filament over a conducting ground plane in the case where the current propagates along the filament at the speed of light, and this solution is interpreted in terms of radiation from lightning return by: In Antenna-Theory-type models (e.g.

[]) known as AT models, the strike object and the lightning channel are represented using thin wires. The Maxwell’s equations are numerically solved using the method of moments [8] to find the current distribution along the lightning channel, from which the radiated electromagnetic fields can be computed.

Abstract: We calculate vertical electric field and azimuthal magnetic field at different elevation angles and distances associated with lightning strikes a tall object.

Simple and exact expressions for electromagnetic fields are derived when the current reflection coefficient at tall object top is zero and return stroke propagation speed in the lightning channel is equal to the speed of light.

[1] On the basis of a distributed‐source representation of the lightning channel, the mathematical formulations of the so‐called engineering lightning return stroke models are generalized to take into account the presence of a vertically extended strike object.

The strike object is modeled as a lossless uniform transmission line, and the reflection coefficients are all assumed to be by: (2) Electromagnetic fields from lightning strikes to tall towers are largely determined by the tower and only to a lesser extent by the channel.

Consequently, electromagnetic fields associated with strikes to tall objects are less model‐sensitive than those corresponding to a strike to by: Lightning strikes to the Toronto CN Tower have been observed since Sincethe lightning current derivative resulting from strikes to the CN Tower and the corresponding electromagnetic.

The interaction of lightning with the ‐m high CN Tower in Toronto is modeled using the antenna theory model. A simple lossless wire structure is used to represent the tower. The return‐stroke ch Cited by: W. Janischewskyj, A.M. Hussein, V. Shostak, P. Dzurevych, W.A. Chisholm, Analysis of electromagnetic fields from lightning strikes to the Toronto CN tower and from lightning in the surrounding area, in: presented at CIGRE Symposium on Power System Electromagnetic Compatibility, Lausanne, Switzerland, Cited by: The computation of lightning electric and magnetic fields requires the use of a model that specifies current as a function of time at all points along the radiating lightning channel.

The computed fields can be used as an input to electromagnetic coupling models, the latter, in turn, being used for the calculation of lightning induced voltages File Size: KB. THE CALCULATION OF THE RADIATION FIELD Let P in Fig.

2 be the distant point at which one wishes to find the radiated field. If k is a unit vector measured vertically upward from the surface of the earth, the vector potential at P is (MKS units) A(P,t) = ka (P,0, -~ dx + by: On return stroke currents and remote electromagnetic fields associated with lightning strikes to tall structures: 1.

Computational models amplitude of the electromagnetic field radiated by a lightning strike to a tall structure is magnetic fields from currents in the lightning channel and in the CN tower have been previously studied by Cited by: The computation of lightning electric and magnetic fields requires the use of a model that specifies current as a function of time at all points along the radiating lightning channel.

The computed fields electromagnetic fields Radiated by the lightning channel. Peak current is of interest when lightning strikes an object that presents a resistive load to the lightning current. M.A. Uman, in his book "The Art and Science of Lightning Protection," uses the example of a phase conductor on a power line.conductivity on the electromagnetic field radiated by lightning to tall towers.

The results of the investigation show that the attenuation of the initial peak of the radiated field depends strongly on the current risetime, the tower’s height and the ground conductivity. Paper I deals with the effect of travelling waves of.The electromagnetic fields radiated by lightning We must first learn more about the fields radiated by lightning.

Kawasaki,"Simultaneous Measurement of Lightning Parameters for Strokes to the Toronto Canadian National Tower," J. Geophys. Res.,