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The models proposed for the positive long air gap electrical discharge can be considered to be either engineering or physical in their approach. In this work, we make a general review of the available models and use two of them for a comparison with experimental data. Common underlying assumptions were found in most of the models analyzed. The comparison with the experimental data revealed that the results obtained from the models were a good representation of the physical situation when the leader potential distribution and the leader-corona region evolution were described with certain physical assumptions. [ABSTRACT FROM AUTHOR]

This study carried out a numerical simulation of electrostatic potential distribution in the cylindrical oil tank, focusing on spatial distribution of electrostatic potential and the variation tendency of the potential in the filling operation. Electrostatic potential distribution of stationary oil was illustrated, and the relationship between the electrostatic potential distribution and some parameters of the tank and oil was analyzed as well. Dynamic electrostatic distribution was studied when charged oil is filling into the tank, and ESD prevention measures’ effects on electrostatic potential distribution were simulated. Finally, calculation results of two other types of oil tanks were presented in brief. [ABSTRACT FROM AUTHOR]

Abstract: The charge density distribution of the surface leader has never been measured before. Because the surface leader usually covers a long distance, and the surface potential caused by leader discharge is usually very high, this creates difficulties in measuring the potential distribution of the surface leader. In this paper, with a feedback type electrostatic probe based on a field-nullify technique, a charge density distribution scanning system is developed. A two-layer structure pipe is designed to lower the surface potential after discharge. In this way, the surface potential distribution caused by the residual charge of the leader discharge under the application voltage as high as to 40 kV can be measured. The surface charge density distribution including the leader and streamer is perfectly measured, which is in good agreement with the photograph. [Copyright &y& Elsevier]

Abstract: The aim of this paper is to determine the degree of correlation between the electrostatic potential distribution on the surface of non-woven fabrics and the material structure as obtained by optical means. The potential distribution on the material surface was monitored for several samples of two types of fabrics that were electrically charged using corona discharge. The results show that the charge distribution on the samples surface significantly correlates with the spreading and the third centered moment of the gray-scale pictures of the samples. [Copyright &y& Elsevier]

Abstract: Using the theory of elliptic integrals and the mathematic trick, we obtain analytic distribution functions of the potential and the field on the central axis line generated by an elliptic ring uniformly charged and we make the discussion about it. The important properties of the potential and the field on the central axis line generated by an elliptic ring uniformly charged is shown. [Copyright &y& Elsevier]

Abstract: Because the field of a uniformly charged circular arc involves elliptic integrals, not generally possessing symmetry of a uniformly charged ring, it is difficult to solve and discuss this problem. This paper investigates the problem and presents the potential function and the field function of a uniformly charged circular arc together with discussions about them by using the theory of elliptic integrals and the analytic method. [Copyright &y& Elsevier]