Results 171 to 180 of about 732,564 (210)

Flashover voltage of artificially contaminated surfaces

Proceedings of the Institution of Electrical Engineers, 1971
Tests were carried out to analyse the influence of geometrical and physical parameters of a contaminating layer on the flashover of small flat surfaces. The wet-contaminant method was used, and the alternating and direct flashover voltages were related to different values and distributions of thickness, width and resistivity of the contaminant layer ...
B. Macchiaroli, M. Rea
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Flashover Mechanism of High Voltage Insulators

IEEE Transactions on Power Apparatus and Systems, 1979
The elementary phenomenon involved in flashover of high voltage insulators is the propagation of a discharge at the surface of an electrolyte. The study reveals two requirements: 1-Electrical conditions (applied voltage and discharge current) have to be fulfilled so that the discharge can be sustained by the power source throughout the elongation ...
A. Rahal, C. Huraux
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Minimum Flashover Voltage of Iced Insulators

IEEE Transactions on Electrical Insulation, 1983
Experimental studies were performed in a 4.8×2.8×3.5 m3 cold room with a HV transformer of 124 kVA, 120 kV. Atmospheric ice was accreted on a vertical string of three types of insulators: a classic glass insulator and two long-rod synthetic insulators. The results obtained show that flashover occurs at the lowest voltage with hard rime formed at -12°C ...
L. C. Phan, H. Matsuo
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Flashover voltage of contaminated insulators

Conference Record of the 1988 IEEE International Symposium on Electrical Insulation, 2003
Methods have been developed for the calculation of flashover voltage of contaminated circular strip models and outdoor insulators of practical but simple geometric shape. The criteria for discharge elongation and the assumptions made are examined. A typical flow diagram of the programs for evaluating the critical values using the equations derived is ...
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A Study of High-Voltage Flashovers

Transactions of the American Institute of Electrical Engineers, 1929
A brief discussion is given of the various forms of electrical discharges as they are characterized by the physicists. Oscillographic records secured of voltages and currents, both before and during the flashovers, are reproduced and discussed. Polarity tests are described in which the electrode shape and spacing were found to determine the sign of the
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DC Flashover Voltage Characteristics of Contaminated Insulatirs

IEEE Transactions on Electrical Insulation, 1981
An investigation was made of the influence of the dc power source on the withstand voltage ofntam-contaminated insulators. A thyristor-controlled power source was found stiff enough for the tests. DC contamination tests on various insulators were also carried out. The dc withstand voltage is generally lower than the ac one (rms).
T. Fujimura, K. Naito, Y. Suzuki
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Effect of altitude on the flashover voltage of contaminated insulators

Proceedings of Conference on Electrical Insulation and Dielectric Phenomena - CEIDP '96, 2002
Contamination flashover of insulators depends not only on the severity and type of contamination, but also on the altitude at which these insulators are situated. Reduced pressure or air density combined with light contamination at high altitudes decreases the flashover voltage. Experimental testing of a number of insulators for a wide range of outdoor
R. Sundararajan, R.W. Nowlin
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Calculation of Impulse Flashover Voltage of a Water Column

IEEE Transactions on Electrical Insulation, 1986
The impulse flashover voltage of a water colume has been calculated using numerical techniques, while considering the constriction of the water column and the dynamic behavior of the discharge propagating along a water surface. The computed values have been compared with the experimental results obtained under 1/5, 1/50, 1/500, 1/5000, 1/50000 impulse ...
A. Rumeli, M. Hizal
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Flashover prevention of high voltage piezoelectric transformers

2009 IEEE Pulsed Power Conference, 2009
Piezoelectric transformers are used as step-up voltage elements in many devices [1, 2]. The University of Missouri is developing a piezoelectric transformer as an accelerator for an ion beam [3]. In cases where high voltage pulses are desired, discharges can result from a large electric field near triple point junctions [4, 5].
Andrew Benwell, Scott Kovaleski, Tongtawee Wacharasindhu, Jae Wan Kwon, Emily Baxter   +4 more
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Effect of area on surface flashover voltage in vacuum

IEEE Transactions on Electrical Insulation, 1988
It is known that the breakdown voltage in a vacuum insulation system drops with an increase in linear dimension of electrodes and with an increase in the number of insulating spacers bridging the gap. Normally this is explained to be the result of the increase in the number of so-called weak links in the system. The influence of an external capacitance
J.D. Cross, B. Mazurek
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