Results 131 to 140 of about 1,997 (175)
Some of the next articles are maybe not open access.
Effects of soluble constituents on insulator flashover performance and flashover voltage prediction
2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), 2015Pollution materials affect insulator flashover performance, and there is long-term significance in researching it. In this paper, common kinds of nitrates were used as the soluble pollution, and the ac flashover tests of typical glass insulator were carried out. During the tests, the samples were polluted by dipping method. Also, up-and-down method was
Dongdong Zhang +4 more
openaire +1 more source
Effects of the contour of DC insulators on icing flashover process and flashover voltage
Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417), 2004In this paper, laboratory investigations of discharge processes and flashover performances in the low pressure and icing conditions of the high altitude areas simulated in the artificial climate chamber were carried out on XZP-160, XWP4-160 porcelain insulators, FC160P/C170DC glass insulator and lO kV DC composite insulator.
null Lichun Shu +4 more
openaire +1 more source
Flashover voltage of artificially contaminated surfaces
Proceedings of the Institution of Electrical Engineers, 1971Tests 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
openaire +1 more source
Flashover voltage of contaminated insulators
Conference Record of the 1988 IEEE International Symposium on Electrical Insulation, 2003Methods 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 ...
openaire +1 more source
Flashover Mechanism of High Voltage Insulators
IEEE Transactions on Power Apparatus and Systems, 1979The 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
openaire +1 more source
Minimum Flashover Voltage of Iced Insulators
IEEE Transactions on Electrical Insulation, 1983Experimental 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
openaire +1 more source
DC Flashover Voltage Characteristics of Contaminated Insulatirs
IEEE Transactions on Electrical Insulation, 1981An 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
openaire +1 more source
Calculation of Impulse Flashover Voltage of a Water Column
IEEE Transactions on Electrical Insulation, 1986The 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
openaire +1 more source
A Study of High-Voltage Flashovers
Transactions of the American Institute of Electrical Engineers, 1929A 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
openaire +1 more source
Effect of area on surface flashover voltage in vacuum
IEEE Transactions on Electrical Insulation, 1988It 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
openaire +1 more source