Results 261 to 270 of about 6,317,441 (292)

Optimization design of shielding ring for restraining surface charge accumulation

2010 IEEE International Power Modulator and High Voltage Conference, 2010
The surface of insulators in the GIL is prone to generate charges under a DC high-voltage for a long time, which has a great impact on insulation performance of the insulators. The accumulation of the surface charges is mainly related to surface normal field on insulators.
Gui-xin Zhang, Bei Wang, Qiang Wang
openaire   +1 more source

Surface charge accumulation and decay on directfluorinated oil-impregnated paper

IEEE Transactions on Dielectrics and Electrical Insulation, 2016
The oil-impregnated paper, as a vital part in the oil-paper insulation system, serves as the main insulation medium in converter transformer suffering various electric fields. However, the accumulated surface charge on the paper would accelerate the degradation of insulation system and may lead to surface flashover.
B. X. Du, X. L. Li, J. P. Jiang
openaire   +1 more source

Effects of Fluorination on Surface Charge Accumulation and Decay of Polyimide Film

Japanese Journal of Applied Physics, 2013
In this paper, we present a study aimed at clarifying the effects of fluorination time on surface charge accumulation and decay behaviors of fluorinated polyimide films. The samples were surface-fluorinated in a laboratory vessel at about 328 K using a F2/N2mixture with 20% F2by volume at 0.05 MPa for 15, 30, 45, and 60 min.
Boxue Du, Jie Li, Heng Du
openaire   +1 more source

Charge accumulation on the surface of GaAs nanowires near the Schottky contact

Technical Physics Letters, 2013
The distribution of external potential along GaAs nanowires with electric contacts formed at the ends has been studied by the method of Kelvin probe force gradient microscopy (KPFGM). It is established that, in the case of Schottky contact formation, the application of external blocking voltage leads to charge accumulation in the surface layer of ...
M. S. Dunaevskii, P. A. Alekseev, M. I. Lepsa, D. Grützmacher, A. N. Titkov   +4 more
openaire   +1 more source

Gamma-ray Irradiation Inhibiting Surface Charge Accumulation on Polyethylene

IEEE Transactions on Dielectrics and Electrical Insulation, 2009
Polymer insulating materials installed in electrical and electronic devices are widely used in spacecraft and nuclear power stations where the polymers are exposed to energetic radioactive rays. The chemical structure can be changed by radiation induced reactions that possibly gives rise to the alteration of characteristics of surface charge, which can
B. X. Du, Y. Gao
openaire   +1 more source

Temporal behavior of surface charge accumulation in bridged vacuum gaps

IEEE Transactions on Dielectrics and Electrical Insulation, 1995
Temporal change in electric field strength at the insulator-cathode-vacuum interface accompanied by charging of the insulator have been studied by using a two-dimensional Monte Carlo simulation. The study employed cylindrical and conical insulators. Each of the insulators was made of PMMA, polyimide or Al/sub 2/O/sub 3/.
O. Yamamoto, T. Hara, H. Matsuura, R. Hayashi   +3 more
openaire   +1 more source

Characteristics of Surface Charge Accumulation on Spacers and Its Influencing Factors

Electronics (Switzerland)
Charge accumulation usually happens on the surface of spacers under DC operation, which is susceptible to inducing surface flashover. In order to explore the surface charge accumulation mechanisms and the influences of dielectric conductivity, gas ion mobility, and temperature field on the surface charges, a time-varying charge density model at the gas–
Hui Jiang
exaly   +2 more sources

Initial conditions of surface charge accumulation under impulse voltage

Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2003
The surface charge distributions under impulse voltage are measured. Two types of insulators are investigated. The influence of impulse voltage magnitude on the surface charge accumulation is studied. It is shown that the pre-discharge current has a neutralization effect on charge accumulation, which makes the surface charging very weak when the ...
F. Wang, Y. Qiu, Q. Zhang, X.Q. Qiu, E. Kuffel   +4 more
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Surface charge decay characteristics of epoxy spacer under space charge accumulation

Journal of Physics D: Applied Physics
Abstract Under DC voltage, space charge inevitably accumulates within the spacer, thereby influencing the dissipation of surface charges. In this study, a charge measurement platform for epoxy resin spacers is constructed. The temporal variation of the surface charge distribution under space charges is compared. The results indicate that
Fangwei Liang, Hanhua Luo, Weijian Zhuang, Zuodong Liang, Xianhao Fan, She Chen, Qiuqin Sun   +6 more
openaire   +1 more source

Surface charge accumulation in a dielectric-covered electrode system in air

Proceedings of 2001 International Symposium on Electrical Insulating Materials (ISEIM 2001). 2001 Asian Conference on Electrical Insulating Diagnosis (ACEID 2001). 33rd Symposium on Electrical and Electronic Insulating Materials and Applications in System, 2002
This paper's focus is an experimental study of the charging process in a plane-parallel disc shaped electrode system during applications of unipolar impulse voltages. Discharge current measurements together with surface charge assessments during single impulse as well as sequence of impulses of both polarities, and at various air gap widths are ...
M.L.-A. Sjoberg, C. Rein, S.M. Gubanski, M.A.S. Leijon   +3 more
openaire   +1 more source