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You searched for subject:(Trichel pulse). Showing records 1 – 3 of 3 total matches.

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University of Western Ontario

1. Sattari, Paria. FEM-FCT Based Dynamic Simulation of Trichel Pulse Corona Discharge in Point-Plane Configuration.

Degree: 2011, University of Western Ontario

In this thesis, a new two-dimensional numerical solver is presented for the dynamic simulation of the Trichel pulse regime of negative corona discharge in point-plane configuration. The goal of this thesis is to simulate the corona discharge phenomenon and to improve the existing models so that the results have an acceptable compatibility with the experimentally obtained data. The numerical technique used in this thesis is a combination of Finite Element Method (FEM) and Flux Corrected Transport (FCT). These techniques are proved to be the best techniques, presented so far for solving the nonlinear hyperbolic equations that simulate corona discharge phenomenon. The simulation begins with the single-species corona discharge model and thedifferent steps of the numerical technique are tested for this simplified model. The ability of the technique to model the expected physical behaviour of ions and electric field is investigated. Then, the technique is applied to a more complicated model of corona discharge, a three-specie model, in which three ionic species exist in the air gap: electrons, and positive and negative oxygen ions. Avalanche ionization, electron attachment and ionic recombination are the three ionic reactions which this model includes. The macroscopic parameters i.e., the average corona current and the Trichelpulses period are calculated and compared with the available experimental data. The technique proves to be compatible with the available experimental results. Finally, the effects of different parameters on the Trichel pulse characteristics are investigated. The results are further compared against the available experimental data for the effect of pressure on Trichel pulse characteristics and are reported to be compatible.

Subjects/Keywords: negative electric corona discharge; Trichel pulse; finite element method; flux corrected transport; numerical simulation; Electromagnetics and Photonics

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APA (6th Edition):

Sattari, P. (2011). FEM-FCT Based Dynamic Simulation of Trichel Pulse Corona Discharge in Point-Plane Configuration. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/215

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Sattari, Paria. “FEM-FCT Based Dynamic Simulation of Trichel Pulse Corona Discharge in Point-Plane Configuration.” 2011. Thesis, University of Western Ontario. Accessed January 18, 2020. https://ir.lib.uwo.ca/etd/215.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Sattari, Paria. “FEM-FCT Based Dynamic Simulation of Trichel Pulse Corona Discharge in Point-Plane Configuration.” 2011. Web. 18 Jan 2020.

Vancouver:

Sattari P. FEM-FCT Based Dynamic Simulation of Trichel Pulse Corona Discharge in Point-Plane Configuration. [Internet] [Thesis]. University of Western Ontario; 2011. [cited 2020 Jan 18]. Available from: https://ir.lib.uwo.ca/etd/215.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sattari P. FEM-FCT Based Dynamic Simulation of Trichel Pulse Corona Discharge in Point-Plane Configuration. [Thesis]. University of Western Ontario; 2011. Available from: https://ir.lib.uwo.ca/etd/215

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Western Ontario

2. Dordizadeh Basirabad, Peyman. Numerical and Experimental Study of the Trichel Pulses in Needle-plane Geometry.

Degree: 2016, University of Western Ontario

One of the unique aspects of the negative corona discharges in the air is the regular train of pulses that form the discharge current, called Trichel pulses. These pulses are the result of the combination of several phenomena such as the avalanche ionization of the neutral molecules by the impact of the energized electrons, formation of the cloud of positive ions close to the cathode, and formation of the cloud of negative ions at a farther distance from the corona electrode compared to their positive counterparts. In this thesis, the results of a detailed numerical investigation of the formation of Trichel pulses in a needle-plane negative corona discharge, as well as a simulation of the transition of the discharge from Trichel pulse regime to the glow discharge regime, is presented. All presented numerical models in this thesis were three-species models including the motion, generation, and dissipation of three charged species: electrons, positive ions, and negative ions. Also, all models were built using COMSOL multiphysics. Photoionization as the main mechanism for sustaining the positive corona discharge was included in the numerical analysis for both the positive and negative corona discharges using the three exponential approximation. A parametric study of the impact of different model coefficients on the characteristic of the Trichel pulses including the repetition frequency, average DC current and pulse rise time was investigated. The studied parameters include coefficients of the two ionization, and attachment reactions, the mobilities of the three charged species considered, electrons, positive ions, and negative ions, and the coefficient of the secondary electrons emitted from the needle. It was shown that two reactions, the recombination of positive and negative ions, and the recombination of electrons and positive ions play a minor role in the calculated characteristics of the Trichel pulses. Finally, an experimental study of the characteristics of the Trichel pulses in air at room temperature, pressure, and relative humidity has been conducted. The impact of different parameters: the needle voltage, needle-plane distance and the radius of curvature of the needle’s tip on the frequency, DC current, and the temporal characteristics of the pulses (rise time, fall time, and the pulse width) was studied. Four different needles with radii of curvature ranging from 19 to 55 microns were used. Applied voltage on the needle was varied from the onset voltage (-4 kV to -6 kV) to -10 kV. It was observed that the temporal characteristics of the pulses such as rise time, was not a function of needle tip radius of curvature, voltage level, or needle-plane distance. The experimental data were compared with the results of a numerical simulation. The experimental findings were in a good agreement with the results of the numerical model.

Subjects/Keywords: Corona discharge; Trichel pulse; Photoionization; Non-thermal plasma; Drift-diffusion equation; Poisson’s equation; Power and Energy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Dordizadeh Basirabad, P. (2016). Numerical and Experimental Study of the Trichel Pulses in Needle-plane Geometry. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/4167

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Dordizadeh Basirabad, Peyman. “Numerical and Experimental Study of the Trichel Pulses in Needle-plane Geometry.” 2016. Thesis, University of Western Ontario. Accessed January 18, 2020. https://ir.lib.uwo.ca/etd/4167.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Dordizadeh Basirabad, Peyman. “Numerical and Experimental Study of the Trichel Pulses in Needle-plane Geometry.” 2016. Web. 18 Jan 2020.

Vancouver:

Dordizadeh Basirabad P. Numerical and Experimental Study of the Trichel Pulses in Needle-plane Geometry. [Internet] [Thesis]. University of Western Ontario; 2016. [cited 2020 Jan 18]. Available from: https://ir.lib.uwo.ca/etd/4167.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dordizadeh Basirabad P. Numerical and Experimental Study of the Trichel Pulses in Needle-plane Geometry. [Thesis]. University of Western Ontario; 2016. Available from: https://ir.lib.uwo.ca/etd/4167

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Queensland University of Technology

3. Hinde, David Derek. Corona discharges on the surfaces of high voltage composite insulators.

Degree: 2009, Queensland University of Technology

The degradation of high voltage electrical insulation is a prime factor that can significantly influence the reliability performance and the costs of maintaining high voltage electricity networks. Little information is known about the system of localized degradation from corona discharges on the relatively new silicone rubber sheathed composite insulators that are now being widely used in high voltage applications. This current work focuses on the fundamental principles of electrical corona discharge phenomena to provide further insights to where damaging surface discharges may localize and examines how these discharges may degrade the silicone rubber material. Although water drop corona has been identified by many authors as a major cause of deterioration of silicone rubber high voltage insulation until now no thorough studies have been made of this phenomenon. Results from systematic measurements taken using modern digital instrumentation to simultaneously record the discharge current pulses and visible images associated with corona discharges from between metal electrodes, metal electrodes and water drops, and between waters drops on the surface of silicone rubber insulation, using a range of 50 Hz voltages are inter compared. Visual images of wet electrodes show how water drops can play a part in encouraging flashover, and the first reproducible visual images of water drop corona at the triple junction of water air and silicone rubber insulation are presented. A study of the atomic emission spectra of the corona produced by the discharge from its onset up to and including spark-over, using a high resolution digital spectrometer with a fiber optic probe, provides further understanding of the roles of the active species of atoms and molecules produced by the discharge that may be responsible for not only for chemical changes of insulator surfaces, but may also contribute to the degradation of the metal fittings that support the high voltage insulators. Examples of real insulators and further work specific to the electrical power industry are discussed. A new design concept to prevent/reduce the damaging effects of water drop corona is also presented.

Subjects/Keywords: corona discharges; discharge current; onset voltage; point-plane; repetition rate; Trichel pulse; emission spectra; silicone rubber; water drop corona; high voltage insulators

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Hinde, D. D. (2009). Corona discharges on the surfaces of high voltage composite insulators. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/29320/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Hinde, David Derek. “Corona discharges on the surfaces of high voltage composite insulators.” 2009. Thesis, Queensland University of Technology. Accessed January 18, 2020. https://eprints.qut.edu.au/29320/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Hinde, David Derek. “Corona discharges on the surfaces of high voltage composite insulators.” 2009. Web. 18 Jan 2020.

Vancouver:

Hinde DD. Corona discharges on the surfaces of high voltage composite insulators. [Internet] [Thesis]. Queensland University of Technology; 2009. [cited 2020 Jan 18]. Available from: https://eprints.qut.edu.au/29320/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hinde DD. Corona discharges on the surfaces of high voltage composite insulators. [Thesis]. Queensland University of Technology; 2009. Available from: https://eprints.qut.edu.au/29320/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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