Results 251 to 260 of about 228,648 (305)
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Electro-Discharge Machined Surfaces
1975Existing published work on the nature of electro-discharge machined surfaces is reviewed and discussed, including deformation and damage, and metallurgical structure and physico-chemical changes.
J. R. Crookall, B. C. Khor
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Surface analysis by glow discharge
Surface and Interface Analysis, 1981Abstract This paper deals with the possibilities of glow discharge spectroscopy for surface analysis of metals. After a brief résumé of the principles and characteristics of the technique, examples of results obtained are given concerning the control of sub‐surface compositions after thermal or thermometric treatment of steels ...
R. Berneron, J. C. Charbonnier
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Surface Wave Sustained Discharges
2006A selfconsistent modeling of discharges obviously aims at a full description without requiring prior knowledge or diagnostic determination of any parameter beyond those actually chosen by an operator in the laboratory, i.e. beyond gas type and pressure, geometry and material of discharge tube, electric field frequency and voltage setting of power ...
S. Grosse, H. Schlüter, M. Schlüter
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1990
Surface discharge switches can provide many advantages including simplicity of construction, accurate trigger control, low switching jitter and wide dynamic operating range. The main advantage, however, is the ease with which multichannel breakdown and therefore low switch inductance can be achieved.
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Surface discharge switches can provide many advantages including simplicity of construction, accurate trigger control, low switching jitter and wide dynamic operating range. The main advantage, however, is the ease with which multichannel breakdown and therefore low switch inductance can be achieved.
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Electro Discharge Machined Surface
1990The figures presented in this section relate to a surface typical of those produced by the electro discharge machining (or spark machining) process undertaken at a bulk machining setting. The surface has an extremely random structure, caused by the electrical discharges randomly impinging on the surface through the di-electric fluid during the ...
K. J. Stout, E. J. Davis, P. J. Sullivan
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Some properties of surface discharges
IEE Colloquium on Atmospheric Discharges for Chemical Synthesis, 1998Electrical discharges can occurring in a gas, liquid or a vacuum in close vicinity to a solid dielectric surface. Such a discharge is known as a surface discharge. As a result of the proximity of the discharge plasma to the surface considerable degradation of the solid dielectric surface can occur.
R.A. Fouracre, S.J. MacGregor, F. Teuma
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Guided discharges over dielectric surfaces
IEE Colloquium on Surface Phenomena Affecting Insulator Performance, 1998Surface discharge activity is extremely detrimental to the properties of the underlying dielectric to which the discharge is closely coupled and is of general interest to electrical engineers, chemists and polymer scientists. The surface discharge can either be used for situations when a diagnostic tool is required to investigate surface degradation ...
R.A. Fouracre +3 more
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Surface discharges along polymer foam
ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132), 2002The behavior of partial discharges (PD) along a polymer foam insulator in air is investigated at 50 Hz AC voltage. The results were compared to the PD behavior along other solid/air interfaces. The PD inception voltage depends on the dielectric constant of the solid material. It was highest for the foam/air interface.
U. Fromm +6 more
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Electrical Surface Discharges on Wet Polymer Surfaces
1998This paper tackles the problem of the influence of water droplets on the surface of HV insulators on the electric field distribution. During the lifetime of such a high voltage component, the surface of the solid insulation is very often stressed with layers of water droplets. These droplets tend to deform the electric field.
Hans-Joachim Kloes +2 more
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Optical detection of surface discharges
IEEE Transactions on Electrical Insulation, 1988The use of an optical detection system for measuring surface discharges is described. A photomultiplier tube (PM) transforms the photon pulses emitted by the discharge process into an electrical signal. To suppress the noise inherent to PM operation, filters were built in the amplitude- and time-domains. Results of discharge measurements showed that in
F.H. Kreuger +2 more
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