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Power Production by Gravitomagnetic Effect on a Rotating Mass
2023 International Conference on Clean Electrical Power (ICCEP)
Year: 2023 | Conference Paper |
The gravito-magnetic effect on rotating masses is well known. In the present work the possibility of extracting electrical energy from an electric motor-generator system is investigated. First of all a theoretical model is outlined which justifies the energy conversion. Subsequently, the experimental equipment used is described. Finally, the results of the experimental tests carried out are report...Show More
Analytically Regularized Evaluation of the Wakefield of a Particle Travelling through a Plane Conducting Ring
Dario Assante;Gaetano Panariello;Fulvio Schettino;Luigi Verolino
In this work the wakefield of a charged particle traveling through a plane conducting ring is evaluated. The problem is formulated in the spectral domain as integral equations of Fredholm type, solved by Galerkin method employing entire domain functions factorizing the correct edge behavior of the unknown induced current. As a result, high accuracy and numerical stability are achieved, allowing th...Show More
A Second-Kind Fredholm Integral-Equation Approach for Simple Low- and High-Frequency Solutions of the Perfectly-Conducting Circular Disk
2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE
Year: 2020 | Conference Paper |
The electromagnetic interaction of a vertical magnetic dipole axially symmetric with an infinitesimally thin perfectly conducting circular disk is studied and solved by transforming the original dual integral-equation system describing the problem into two forms of the single second-kind Fredholm integral equation. In this way, simple low- and high-frequency asymptotic solutions are easily derived...Show More
Utilization of Underbuilt Shield Wires to Improve the Lightning Performance of Overhead Distribution Lines Hit by Direct Strokes
Rodolfo Araneo;Amedeo Andreotti;Jose Brandão Faria;Salvatore Celozzi;Dario Assante;Luigi Verolino
The improvement of the lightning performance of overhead distribution lines, hit by direct strokes, is investigated considering the use of additional shield wires beneath the phase conductors. The frequency-domain theory of multiconductor transmission lines with periodical grounding is adopted permitting a rigorous evaluation of the phase and shield wire currents and of the overvoltages across ins...Show More
Regularization Techniques for the Evaluation of the Induced Currents on a Thin Disk
A. Andreotti;R. Araneo;D. Assante;P. Burghignoli;S. Celozzi;G. Lovat;L. Verolino
2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)
Year: 2019 | Conference Paper |
The paper deals with the problem of finding the currents induced on a perfectly conducting disk of negligible thickness, in presence of a vertical magnetic dipole placed along the disk axis. The problem is of interest for several scattering problems with circular symmetry, from shielding surfaces to printed antennas. In particular, we present a regularization technique which allows for formulating...Show More
Lightning Performance of Overhead Distribution Lines with Underbuilt Ground Wires
R. Araneo;S. Celozzi;J. Brandão Faria;A. Andreotti;L. Verolino
2019 International Applied Computational Electromagnetics Society Symposium (ACES)
Year: 2019 | Conference Paper |
We investigate the improvement of the lightning performance of overhead distribution lines by additional ground wires placed beneath phase conductors. We adopt a time-domain method based on the matrix formalism of multiconductor (MTL) transmission lines that allows for the computation of overvoltages across insulator strings, when direct lightning hits a tower or a ground wire.Show More
Improvement of Lightning Performance of Overhead Power Lines by Addition of Underbuilt Ground Wires
R. Araneo;G. Lovat;S. Celozzi;J. Brandão Faria;A. Andreotti;L. Verolino
We investigate the improvement of the lightning performance of overhead power lines through the use of additional ground wires placed below the phase conductors. The analysis of the electrical system is carried out through a method based on the conventional multiconductor transmission-line formalism. In the presence of a direct lightning, both the currents flowing in phase conductors and ground wi...Show More
Exact and Approximate Analytical Solutions for Lightning-Induced Voltage Calculations
In this paper, we thoroughly review all analytical solutions (both exact and approximate) presented to date in the literature for evaluation of voltages induced on a lossless horizontal conductor, placed over an infinite-conductivity ground, and excited by an external field produced by either a step function or a linearly rising current, moving unattenuated and undistorted along a vertical lightni...Show More
On the Kernel of the Cooray–Rubinstein Formula in the Time Domain
The kernel of the Cooray-Rubinstein formula in the time domain involves a modified Bessel function of order zero. In this letter, approximations of the kernel are proposed, which do not use any special function, and, hence, are able to simplify the numerical evaluation in view of lightning-induced voltages calculations.Show More
Reply to “Comments on a New Channel–Base Current Function for Lightning Studies”
A correspondence has been published to comment on the recently published paper “A new channel-base current function for lightning studies” by the authors. The correspondence contains a number of criticisms to the solutions presented in that paper. In this paper, we provide our replies to the raised criticisms.Show More
A New Channel-Base Current Function for Lightning Studies
In this paper, we propose a new channel-base current function for lightning studies. Main features of the new function are presented, also by comparison with existing expressions; relevant advantages are highlighted. For this new function, closed-form solutions of the time integral (representing the transferred charge), of the Fourier transform, and of the specific energy are given.Show More
Some Developments of the Cooray–Rubinstein Formula in the Time Domain
A rigorous formula representing the counterpart of the Cooray-Rubinstein expression in the time domain has recently been derived by the authors. In this paper, the formula is particularized for the cases of a unit step and a linearly rising channel-base current, waveforms frequently used in lightning performance studies. Furthermore, an approximate kernel of the formula is also presented, allowing...Show More
A New Formulation of the Cooray–Rubinstein Expression in Time Domain
In this paper, a new formulation in the time domain of the Cooray-Rubinstein expression is presented. This new formulation overcomes the problems related to the previous formulation: The Dirac pulse contained in the kernel of the previous formulation is extracted, making the numerical treatment easier and more accurate.Show More
Characteristic Impedance of Periodically Grounded Lossless Multiconductor Transmission Lines and Time-Domain Equivalent Representation
We present an efficient procedure for the calculation of the characteristic impedance matrix of a lossless multiconductor transmission line with one or more conductors periodically grounded. This matrix can be used to properly simulate power transmission or distribution lines with shield wires periodically grounded and, also, distribution lines with grounded neutral. The presented procedure can be...Show More
Analytical Formulations for Lightning-Induced Voltage Calculations
Amedeo Andreotti;Antonio Pierno;Vladimir A. Rakov;Luigi Verolino
Recently, Andreotti (2009) have presented an analytical solution for the evaluation of voltages induced on an infinitely long, lossless, single-conductor located at a given height above an infinite-conductivity ground plane, and excited by an external field due to a step current wave moving without attenuation and at a constant speed along a vertical lightning channel. The solution presented, in c...Show More
Considerations on the characteristic impedance of periodically grounded multiconductor transmission lines
International Symposium on Electromagnetic Compatibility - EMC EUROPE
Year: 2012 | Conference Paper |
Cited by: Papers (1)
The paper deals with the evaluation of the characteristic impedance of a multiconductor transmission line with one conductor periodically grounded. The topic, even if not adequately discussed in literature, has a relevant application in the analysis of the role of the shield wire in power lines, in order to quantify the mitigation of induced overvoltages. The problem is here modelled, leading to a...Show More
Calculation of Voltages Induced on Overhead Conductors by Nonvertical Lightning Channels
Amedeo Andreotti;Carlo Petrarca;Vladimir A. Rakov;Luigi Verolino
Effects of lightning channel tortuosity and tilt on lightning electric fields and voltages induced on overhead conductors are examined. Overall inclination of the bottom few hundred meters of the lightning channel can appreciably change both the ground-level vertical electric held at distances less than 1 km or so and induced voltage peak relative to the vertical-channel assumption. Smaller-scale ...Show More
Lightning electromagnetic fields and induced voltages: Influence of channel tortuosity
Amedeo Andreotti;Umberto De Martinis;Carlo Petrarca;Vladimir A. Rakov;Luigi Verolino
2011 XXXth URSI General Assembly and Scientific Symposium
Year: 2011 | Conference Paper |
Cited by: Papers (15)
Models for calculation of lightning induced overvoltages usually assume a straight and vertical lightning channel. However, it is well known that the lightning path is tortuous on scales ranging from 1 m to 1 km. In this paper the tortuosity effect is analyzed for both lightning-generated electromagnetic fields and induced voltages. For a schematic representation of tortuous lightning channel, it ...Show More
Electromagnetic Coupling of Lightning to Power Lines: Transmission-Line Approximation versus Full-Wave Solution
Amedeo Andreotti;Dario Assante;Vladimir A. Rakov;Luigi Verolino
The problem of accurate prediction of lightning-induced overvoltages on power lines still attracts considerable attention. A variety of approaches of different levels of sophistication have been proposed. In particular, transmission-line (TL) approximation is widely used for describing electromagnetic coupling of lightning with power lines. In this paper, validity of this approach for lossless lin...Show More
An Exact Closed-Form Solution for Lightning-Induced Overvoltages Calculations
We present the evaluation of the induced voltages in a lossless single transmission line, located at a given height over an infinite conductivity ground plane, and exited by an external field due to a step current moving along a vertical channel. This is a classic topic of the theory of lightning-induced voltages on power lines. The technical literature related to this topic has performed a signif...Show More
Fast and accurate evaluation of the underground lightning electromagnetic field
2008 International Symposium on Electromagnetic Compatibility - EMC Europe
Year: 2008 | Conference Paper |
Cited by: Papers (2)
Underground cables and devices may be very sensible to underground lightning electromagnetic field, especially if connected to power electronic systems. The underground lightning electromagnetic field can be analytically expressed in terms of Sommerfeld integrals, whose rigorous calculation requires a valuable computational effort. Approximate expressions and numerical approaches have been propose...Show More
Lightning induced voltages on power lines: a new statistical approach
2008 International Symposium on Power Electronics, Electrical Drives, Automation and Motion
Year: 2008 | Conference Paper |
Cited by: Papers (9)
The indirect lightning performances of distribution lines are related to two main aspects: the induced overvoltages calculation and the statistical treatment of the obtained results. In the paper, both the aspects are treated. In particular, an exact closed form solution will be used to calculate the induced overvoltage, and the consequent statistical treatment will be carried out taking into acco...Show More
Transverse line parameters of coupled microstrips on a lossy substrate
2007 18th International Zurich Symposium on Electromagnetic Compatibility
Year: 2007 | Conference Paper |
This paper deals with the evaluation of the frequencydependent transverse line parameters C and G of coupled microstrips on a lossy substrate. The proposed full wave approach, combined with the use of the Neumann series, allows a simple and fast computing solution of the problem and accurately takes into account the proximity effect between the microstrips. The method can also be useful for the va...Show More
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