scholarly journals Modelling Surface Electric Discharge Propagation on Polluted Insulators under AC Voltage

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6653
Author(s):  
Mohamed Lamine Amrani ◽  
Slimane Bouazabia ◽  
Issouf Fofana ◽  
Fethi Meghnefi ◽  
Marouane Jabbari ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Discharge ◽  
Voltage Drop ◽  
Arc Discharge ◽  
Two Dimensions ◽  
Uniform Electric Field ◽  
Proposed Model ◽  
Electrode Length ◽  
Element Approach ◽  
Discharge Propagation

In this contribution, a mathematical model allowing for the prediction of the AC surface arc propagation on polluted insulators under non-uniform electric field is proposed. The approach is based on the experimental concept of Claverie and Porcheron. The proposed model, which makes it possible to reproduce the surface electric discharge, includes a condition for arrest of the propagating discharge. The electric field at the tip of the discharge is the key parameter governing its random propagation. A finite element approach allows for mapping of the electric field distribution while the discharge propagation process is simulated in two dimensions. The voltage drop along the arc discharge path at each propagation step is also taken into account. The simulation results are validated against experimental data, taking into account several electro-geometric parameters (distance between electrodes, pollution conductivity, radius of high-voltage electrode, length of the plane electrode). Good agreement between computed and experimental results were obtained for various test configurations.

scholarly journals Partial Discharge Imaging Correlated with Phase-Resolved Patterns in Non-Uniform Electric Fields with Various Dielectric Barrier Materials

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2676 ◽  
Author(s):  
Marek Florkowski ◽  
Dariusz Krześniak ◽  
Maciej Kuniewski ◽  
Paweł Zydroń
Keyword(s):  
Electric Field ◽  
Optical Imaging ◽  
Partial Discharge ◽  
Stem Length ◽  
Uniform Electric Field ◽  
Diagnostic Systems ◽  
Streamer Discharge ◽  
Dielectric Barrier ◽  
Barrier Materials ◽  
Discharge Propagation

This paper describes a correlation of partial discharge phase-resolved patterns with an optical imaging performed in a non-uniform electric field configuration. The influence of different dielectric barrier materials, placed on the plane electrode, on the discharge propagation and surface landing was investigated. The investigations were focused on the corona at positive polarity of AC high voltage. It was found that the initial positive corona stage is similar for all cases whereas the discharge propagation and surface landing strongly depends on the barrier material properties. The observed streamer discharge modes have been described by the geometrical measures such as stem length, stretch of a discharge profile on the dielectric barrier surface and an hemispherical envelope of discharge filaments. Since various dielectrics reveal different properties of charge accumulation and surface neutralization, the charge memory effect may be visible and can be related to the ability to create and sustain of additional electric field component. It may refer to subsequent discharges as well as to conditions faced at the voltage polarity reversal. The correspondence between different forms of phase-resolved patterns have been associated with the modes of streamer discharges observed by optical imaging. Presented methodology poses huge potential for both scientific investigations on underlying discharge phenomena as well as on the application in future diagnostic systems of HV insulation.

scholarly journals Simulations of the initiation and propagation of streamers in electrical discharges inside water at 3 mm length gap

2018 ◽  
Vol 16 (36) ◽  
pp. 172-180
Author(s):  
Thamir H. Khalaf
Keyword(s):  
Electric Field ◽  
Atmospheric Pressure ◽  
Electrical Discharge ◽  
Two Dimensions ◽  
Dielectric Liquid ◽  
Streamer Discharge ◽  
Field Distributions ◽  
Initiation And Propagation ◽  
Liquid Dielectrics ◽  
Discharge Propagation

This work is devoted to the modeling of streamer discharge, propagation in liquid dielectrics (water) gap using the bubble theory. This of the electrical discharge (streamer) propagating within a dielectric liquid subjected to a divergent electric field, using finite element method (in two dimensions). Solution of Laplace's equation governs the voltage and electric field distributions within the configuration, the electrode configuration a point (pin) - plane configuration, the plasma channels were followed, step to step. The results show that, the electrical discharge (streamer) indicates the breakdown voltage required for a 3mm atmospheric pressure dielectric liquid gap as 13 kV. Also, the electric potential and field distributions shown agreement with the streamer growth, according to the simulation development time.

scholarly journals Duration of luminosity of electric discharge in gases and vapours: further studies

1917 ◽  
Vol 94 (657) ◽  
pp. 88-99 ◽  
Keyword(s):  
Electric Field ◽  
Electric Current ◽  
External Force ◽  
Electric Discharge ◽  
Electrostatic Field ◽  
Transverse Electric ◽  
Arc Discharge ◽  
Transverse Electric Field ◽  
Low Pressures ◽  
Electric Discharge In Gases

In several previous papers, I have described experiments showing that the luminosity of the spark or arc discharge through gases and metallic vapours lasts for an appreciable length of time after the discharge has ceased to pass, and that the luminous vapour can be removed from the region where the electric current is passing, and still remain luminous, showing the same spectrum as before, though in certain cases some lines of this spectrum fade out sooner than others. The present paper is a continuation of these studies. 1. The Luminous Jet at Very Low Pressures. Effect of a Transverse Electric Field . The first experiments to be described were designed to observe the effects at very low gaseous pressures, and with small currents. The advantage of this is that the luminous particles in the jet are then comparatively free to move under the action of an external force, and their motion in an electrostatic field can be conveniently examined. Moreover, since the ions are few, they do not disturb the uniformity of the electric field applied for this purpose.

A study of practice based design research models from knowledge integration perspective

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Honghai LI ◽  
Jun CAI
Keyword(s):  
Knowledge Production ◽  
Theoretical Basis ◽  
Knowledge Integration ◽  
Design Research ◽  
Research Process ◽  
Two Dimensions ◽  
Design Knowledge ◽  
Research Projects ◽  
Proposed Model ◽  
Design Innovation

The transformation of China's design innovation industry has highlighted the importance of design research. The design research process in practice can be regarded as the process of knowledge production. The design 3.0 mode based on knowledge production MODE2 has been shown in the Chinese design innovation industry. On this cognition, this paper establishes a map with two dimensions of how knowledge integration occurs in practice based design research, which are the design knowledge transfer and contextual transformation of design knowledge. We use this map to carry out the analysis of design research cases. Through the analysis, we define four typical practice based design research models from the viewpoint of knowledge integration. This method and the proposed model can provide a theoretical basis and a path for better management design research projects.

Bubble motion in liquid nitrogen under a non-uniform electric field in a microgravity environment

1997 ◽  
Vol 117 (11) ◽  
pp. 1109-1114
Author(s):  
Yoshiyuki Suda ◽  
Kenji Mutoh ◽  
Yosuke Sakai ◽  
Kiyotaka Matsuura ◽  
Norio Homma
Keyword(s):  
Electric Field ◽  
Liquid Nitrogen ◽  
Microgravity Environment ◽  
Uniform Electric Field ◽  
Bubble Motion

Discussion of Electrode Conditioning Mechanism Based on Pre-breakdown Current under Non-uniform Electric Field in Vacuum

2008 ◽  
Vol 128 (12) ◽  
pp. 1445-1451
Author(s):  
Takanori Yasuoka ◽  
Tomohiro Kato ◽  
Katsumi Kato ◽  
Hitoshi Okubo
Keyword(s):  
Electric Field ◽  
Uniform Electric Field
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