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Montano, Raul
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Publications (10 of 23) Show all publications
Rahman, M., Cooray, V., Montano, R., Liyanage, P. & Becerra, M. (2011). NO(X) production by impulse sparks in air. Journal of Electrostatics, 69(6), 494-500
Open this publication in new window or tab >>NO(X) production by impulse sparks in air
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2011 (English)In: Journal of Electrostatics, ISSN 0304-3886, E-ISSN 1873-5738, Vol. 69, no 6, p. 494-500Article in journal (Refereed) Published
Abstract [en]

An experimental study on the production of NO(X) by impulse sparks in air is presented. The emphasis is placed on the dependence of the NO(X) yield on the signature of the discharge current waveforms. A voltage and two current impulses were used in the experiments to create a spark and the NO(X) production was measured by the method of chemiluminescence. The results show that, for a given current waveform, the NO(X) production varies linearly with the peak current and the gap length. In addition, it was found that the NO(X) yield increases with the duration of the current for a given peak current.

Keywords
Nitrogen oxides, Spark, Current waveform, Lightning
National Category
Meteorology and Atmospheric Sciences Engineering and Technology
Research subject
Engineering Science with specialization in Atmospheric Discharges
Identifiers
urn:nbn:se:uu:diva-162674 (URN)10.1016/j.elstat.2011.06.008 (DOI)000296936700004 ()
Available from: 2011-12-09 Created: 2011-12-05 Last updated: 2017-12-08
Arevalo, L., Cooray, V. & Montano, R. (2009). Numerical simulation of long laboratory sparks generated by positive switching impulses. Journal of Electrostatics, 67(2-3), 228-234
Open this publication in new window or tab >>Numerical simulation of long laboratory sparks generated by positive switching impulses
2009 (English)In: Journal of Electrostatics, ISSN 0304-3886, E-ISSN 1873-5738, Vol. 67, no 2-3, p. 228-234Article in journal (Refereed) Published
Abstract [en]

A numerical methodology using two different leader channel criteria has been implemented. The methodology is based on Bondiou and Gallimberti's proposition [A. Bondiou, I. Gallimberti, Theoretical modelling of the development of the positive spark in long spark, J. Phys. D: Appl. Phys. 27 (1994) 1252-1266]. The leader channel criteria used are Rizk engineering criterion [Rizk, A model for switching impulse leader inception and breakdown of long air gaps, IEEE Trans. Power Deliv., 4(1) (1989)] and Local thermodynamic - L.T.E. - physical concept [I. Gallimberti, The mechanism of the long spark formation, Colloque C7, J. Phys. (supplement au nro 7, Tome 40) (July 1979) C7-193]. The methodology was tested in three different cases; a deterministic case, a statistical variation and a typical constant level test. Deterministic calculation considered corona inception using stabilization corona electric field criterion of Gallimberti [I. Gallimberti, The mechanism of the long spark formation, Colloque C7, J. Phys. (supplement au nro 7, Tome 40) (July 1979) C7-193] and the leader moving as segments. The statistical simulation has two different statistical delays, one at inception and the other due to the tortuous characteristics of the leader channel. The constant level test consists of 200 positive switching impulses with the same characteristics such as maximum applied voltage, time to crest and time to fall. Time to breakdown and breakdown voltage were found based on the results obtained from the constant level test characteristics. All the numerical results presented are based on experimental conditions reported in [Les Renardières Group, Research on long gap discharges at Les Renardières, Electra N 35 (1973)] from the world class research group namely Les Renardieres Group.

Keywords
Discharge, Leader, Modeling, Switching
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-113133 (URN)10.1016/j.elstat.2008.12.022 (DOI)000266019500029 ()0304-3886 (ISBN)
Available from: 2010-01-25 Created: 2010-01-25 Last updated: 2017-12-12Bibliographically approved
Montano, R., Theethayi, N. & Cooray, V. (2008). An Efficient Implementation of the Agrawal et al. Model for Lightning-Induced Voltage Calculations Using Circuit Simulation Software. IEEE Transactions on Circuits and Systems Part I: Regular Papers, 55(9), 2959-2965
Open this publication in new window or tab >>An Efficient Implementation of the Agrawal et al. Model for Lightning-Induced Voltage Calculations Using Circuit Simulation Software
2008 (English)In: IEEE Transactions on Circuits and Systems Part I: Regular Papers, ISSN 1549-8328, Vol. 55, no 9, p. 2959-2965Article in journal (Refereed) Published
Abstract [en]

One of the popular, simple, and accurate field-to-wire coupling models for studying transmission-line lightning interaction is the Agrawal et al model [1]. In this model, the coupling mechanisms are represented by distributed sources along the line, wherein each distributed source is due to the horizontal component of the illuminating electric field at that point on the line. These sources give rise to the propagating scattered voltage along the line, while the total voltage at any instant at a given point along the line is the sum of scattered voltage and the voltage at that point due to the illuminating vertical component of the electric field. There is a difficulty in applying the Agrawal et al. model with the built-in transmission-line models of various circuit simulation software such as the Alternate Transients Program-Electromagnetic Transients Program [2]-[5], PSpice [6], Simpow [7], PSS/E [71, etc., as the voltage source due to the horizontal component of the electric field in the Agrawal el al. model is in series with the line impedance [1], [8] and not in between two transmission-line segments. In this paper, a simple circuit approach for efficient implementation of the Agrawal et al. model using any circuit simulation software that has built-in transmission-line models is proposed.

Keywords
Electric impedance, interference, lossy circuits, power systems, transient response, transmission line
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-107096 (URN)10.1109/TCSI.2008.920072 (DOI)000260863700048 ()
Available from: 2009-07-16 Created: 2009-07-16 Last updated: 2016-04-13Bibliographically approved
Arevalo, L., Cooray, V., Montano, R. & Roman, F. (2008). Breakdown effect on long gaps under switching impulses statistical variation. In: : . Paper presented at 29th International Conference on Lightning Protection. Uppsala, Sweden
Open this publication in new window or tab >>Breakdown effect on long gaps under switching impulses statistical variation
2008 (English)Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Uppsala, Sweden: , 2008
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-113402 (URN)
Conference
29th International Conference on Lightning Protection
Available from: 2010-01-28 Created: 2010-01-28 Last updated: 2016-04-12Bibliographically approved
Arevalo, L., Cooray, V. & Montano, R. (2008). Breakdown times and voltages probability calculation using a simplified numerical methodology. In: : . Paper presented at International Conference on Grounding and Earthing and 3rd International Conference on Lightning Physics and Effects. Florianopolis Brazil
Open this publication in new window or tab >>Breakdown times and voltages probability calculation using a simplified numerical methodology
2008 (English)Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Florianopolis Brazil: , 2008
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-113401 (URN)
Conference
International Conference on Grounding and Earthing and 3rd International Conference on Lightning Physics and Effects
Available from: 2010-01-28 Created: 2010-01-28 Last updated: 2016-04-12Bibliographically approved
Liyanage, P., Montano, R. & Cooray, V. (2008). Correlation between current and monochromatic optical signatures of electrical discharges. In: : . Paper presented at 29th International Conference on Lightning Protection. Uppsala, Sweden
Open this publication in new window or tab >>Correlation between current and monochromatic optical signatures of electrical discharges
2008 (English)Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Uppsala, Sweden: , 2008
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-113419 (URN)
Conference
29th International Conference on Lightning Protection
Available from: 2010-01-28 Created: 2010-01-28 Last updated: 2016-04-13Bibliographically approved
Arevalo, L., Montano, R. & Cooray, V. (2008). Modelling of Positive Discharges in Laboratory Gaps under Switching impulses. In: : . Paper presented at XVII International Conference on Gas Discharges and Their applications. Cardiff, UK
Open this publication in new window or tab >>Modelling of Positive Discharges in Laboratory Gaps under Switching impulses
2008 (English)Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Cardiff, UK: , 2008
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-113403 (URN)
Conference
XVII International Conference on Gas Discharges and Their applications
Available from: 2010-01-28 Created: 2010-01-28 Last updated: 2016-04-12Bibliographically approved
Cooray, V., Rakov, V. A., Rachidi, F., Montano, R. & Nucci, C. A. (2008). On the Relationship Between the Signature of Close Electric Field and the Equivalent Corona Current in Lightning Return Stroke Models. IEEE transactions on electromagnetic compatibility (Print), 50(4), 921-927
Open this publication in new window or tab >>On the Relationship Between the Signature of Close Electric Field and the Equivalent Corona Current in Lightning Return Stroke Models
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2008 (English)In: IEEE transactions on electromagnetic compatibility (Print), ISSN 0018-9375, E-ISSN 1558-187X, Vol. 50, no 4, p. 921-927Article in journal (Refereed) Published
Abstract [en]

Engineering return stroke models can be categorized either as current generation (traveling current source type) models or current propagation (transmission line type) models. The current generation models are described among other parameters by a corona current distributed along the channel. Recent studies show that there is equivalence between the models of current generation and current propagation types. Due to this equivalence, any engineering return stroke model of current propagation type can be described in terms of an equivalent corona current per unit channel length. The measurements conducted within 10-500 m from triggered lightning Hashes show that the electric field of subsequent return strokes at these distances flattens within 15 mu s or so. In this paper, the constraints imposed by this feature on the temporal and spatial variation of the equivalent corona current are investigated. The results show that in order for the close fields to flatten within 15 mu s or so, the equivalent corona current, should be bipolar and the corona current wave shape at late times should be identical to that of the longitudinal current time derivative. This is in contrast to most of the engineering models of current generation type, in which the corona current is assumed to be unipolar.

Keywords
Equivalent corona current, lightning electric field, return stroke models
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-106998 (URN)10.1109/TEMC.2008.926918 (DOI)000261573000018 ()
Available from: 2009-07-15 Created: 2009-07-15 Last updated: 2017-12-13Bibliographically approved
Montaño, R., Bäckström, M., Månsson, D. & Thottappillil, R. (2008). On the Response and Immunity of Critical Infrastructures Against IEMI – Current Swedish Research Initiatives. In: : . Paper presented at 19th International Zurich Symposium on Electromagnetic Compatibility. Singapore
Open this publication in new window or tab >>On the Response and Immunity of Critical Infrastructures Against IEMI – Current Swedish Research Initiatives
2008 (English)Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Singapore: , 2008
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-113422 (URN)
Conference
19th International Zurich Symposium on Electromagnetic Compatibility
Available from: 2010-01-28 Created: 2010-01-28 Last updated: 2016-04-13Bibliographically approved
Montaño, R., Bäckström, M., Månsson, D. & Thottappillil, R. (2008). Response and Immunity of Electric Power Infrastructure Against IEMI – Ongoing Swedish Initiatives. In: : . Paper presented at RVK08. Växjö
Open this publication in new window or tab >>Response and Immunity of Electric Power Infrastructure Against IEMI – Ongoing Swedish Initiatives
2008 (English)Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Växjö: , 2008
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-113517 (URN)
Conference
RVK08
Available from: 2010-01-29 Created: 2010-01-29 Last updated: 2016-04-13Bibliographically approved
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