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Journal of Physics D: Applied Physics, 1996
In the theory of electric strength, usually referred to as free-volume theory, breakdown is initiated by free electrons accelerated by electric field in the largest of the holes present in the amorphous phase of all polymers. In contrast to previous publications, the breakdown is treated as the final stage of the disproportionate rise of the electron ...
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In the theory of electric strength, usually referred to as free-volume theory, breakdown is initiated by free electrons accelerated by electric field in the largest of the holes present in the amorphous phase of all polymers. In contrast to previous publications, the breakdown is treated as the final stage of the disproportionate rise of the electron ...
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The electric strength of fibrous glass
Electrical Engineering, 1939The ideal, and probably future, use of fibrous glass for electrical insulation is without an organic filler. Therefore, it is important first to know its electric strength in unimpregnated condition. Test results show its high qualities at elevated gas pressures and temperatures.
A. Gemant, F. A. Glassow
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Nonsustained Breakdowns in Electrical Strength Tests
IEEE Transactions on Power Apparatus and Systems, 1966A study of nonsustained breakdowns has been made during alternating voltage tests on the electric strength of various commercial insulants in transformer oil and compressed sulphur hexafluoride and nitrogen. Such breakdowns do not cause sustained arcing and current flow.
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Electric strength of transformer insulation
Proceedings of the Institution of Electrical Engineers, 1969High-voltage power transformers incorporate large quantities of insulation which is easily contaminated, and the dielectric strength is, in consequence, uncertain. This paper reports the results of electric-strength tests on transformer oil, alone and in combination with solid insulation, under various conditions.
S. Palmer, W.A. Sharpley
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The electric strength of hydrocarbon gases
British Journal of Applied Physics, 1956Careful measurements of the static electric strengths of a number of pure hydrocarbon gases over a range of pressure and spark-gap spacings, including the Paschen minimum are reported. A relationship between strength and molecular structure is found which, if unsaturated compounds such as ethylene, acetylene and butadiene are included, is not so simple
A E D Heylen, T J Lewis
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On the Electric Strengths of Aliphatic Hydrocarbons
Journal of Applied Physics, 1954Paschen's similarity law, which expresses a certain relationship between the breakdown voltage of a gas, the gas pressure, and the distance between electrodes, is known to fail at high pressures. This is owing, at least in part, to a change in the way in which electrons dissipate energy to the gas molecules.
R. W. Crowe +2 more
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Electric Field Strength Due to Electric Excitation
2000We start with the modified Maxwell equations without electric and magnetic charges, having constant scalars for the permeability µ and the permittivity ϵ. The following equations apply to a medium at rest: $$curlH = \in \frac{{\partial E}}{{\partial t}} + {{g}_{e}}$$ (1) $$- curlE = \mu \frac{{\partial H}}{{\partial t}} + {{g}_{m ...
Henning F. Harmuth, Konstantin A. Lukin
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The Electric Strength of Air at High Pressure
Transactions of the American Institute of Electrical Engineers, 1939Results are given of an investigation of the electric strength of air at pressures up to 21 atmospheres. Sparking voltages are presented for air under pressure as measured with 60-cycle alternating voltage applied to sphere gaps. Deviation from the linear pressure-voltage relation that exists at low pressures is discussed, and certain characteristics ...
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Electric Strength of Irradiated Polythene
Nature, 1955THE electric strength of irradiated polythene has been measured for material cross-linked by exposure to 4-MeV. electrons from a linear accelerator. Thin (1-mm.) moulded disks of material (average molecular weight, 17,000) recessed to a thickness of about 50 microns were irradiated in vacuo with doses of 150–300 Mrad , and the electric strength ...
K. H. STARK, C. G. GARTON
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Electric quadrupole strength in nuclei
Nuclear Physics A, 1980Abstract Isoscalar electric quadrupole strength distributions in nuclei are surveyed, and it is concluded that the strength is shared, in most cases, roughly equally between low-lying transitions and the giant quadrupole state. The same is not true of the isovector case.
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