Results 221 to 230 of about 345 (261)
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Useful Life of Vacuum Interrupters
IEEE Transactions on Power Apparatus and Systems, 1978A vacuum interrupter may not be called upon to function to interrupt fault current for relatively lengthy periods of time. In the stand-by mode and carrying rated continuous current, some parts of the interrupter may reach temperatures substantially above ambient.
M. E. Arthur, M. J. Zunick
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Interrupting capacity of vacuum interrupters depending on the frequency of current
IEEE Transactions on Plasma Science, 1993Results of arc reignition voltages during current interruption of frequencies from 5.9 to 60 kHz by a short vacuum gap are presented. Measured arc reignition voltages depend on current amplitude and frequency, the values of preliminary arc current at the moment of switching on the HF current, and the discharge mode in the preceding current semiwave ...
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Current interruption in vacuum
1994The vast majority of power switching devices spend almost all their service life in the closed position, conducting current to a load. Yet the major effort in their design and development is directed to the relatively infrequent occasions when, on command, they interrupt this current, or to the even rarer occasions, when they operate in anger to clear ...
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Dynamic insulation in vacuum interrupters
SPIE Proceedings, 1994Breaking capacity of vacuum circuit breakers is limited by dynamic voltage withstanding of their vacuum interrupters in a sense. Dynamic insulation in a vacuum interrupter can be represented externally by their dielectric recovery behavior and the stability of voltage withstanding.
Jiyan Zou, Junjia He, Li-chun Cheng
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Bouncing phenomena of vacuum interrupters
24th ISDEIV 2010, 2010Bouncing is a phenomenon often observed during circuit-breakers operation. The effect occurs at the moment, when the interrupter contacts touch during closing. For vacuum interrupters, bouncing is caused by the oscillatory motion of the movable vacuum interrupter stem in conjunction with the associated contact springs. The dependencies between involved
Edgar Dullni, Sean-Feng Zhao
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On the prevention of restrikes of vacuum interrupters
Russian Electrical Engineering, 2011In this paper, the authors show the necessity of using vacuum interrupters connected in series at the pole of vacuum circuit breakers designed for a voltage of 110 kV and above to reduce the probability of restrikes up to the values required by the corresponding standard for class C1 and C2 circuit breakers.
A. A. Pertsev +2 more
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V-t characteristics of vacuum interrupter after large current interruption
24th ISDEIV 2010, 2010Because of the contact material's evaporation and ejection of some metal particles out of the contact gap during the flow of the vacuum arc, the contact surface may exhibit some erosion after each operation of vacuum circuit breakers. In this study, the insulation properties were investigated for vacuum interrupters with the rated voltage about 10 kV ...
S. Sato +5 more
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2007
The invention relates to a vacuum interrupter chamber having an insulating ceramic wall, within which contact pieces which move in a vacuum are arranged and are surrounded by a screen between the contact piece and the interrupter chamber wall, according to the preamble of patent claim 1.
ABB TECHNOLOGY AG +3 more
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The invention relates to a vacuum interrupter chamber having an insulating ceramic wall, within which contact pieces which move in a vacuum are arranged and are surrounded by a screen between the contact piece and the interrupter chamber wall, according to the preamble of patent claim 1.
ABB TECHNOLOGY AG +3 more
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The intrinsic limits of vacuum interruption
2008 23rd International Symposium on Discharges and Electrical Insulation in Vacuum, 2008The role of particles, metal vapour, gas and molten electrode surfaces are discussed in relation to post arc failure of vacuum circuit breakers. A new full PIC-Monte-Carlo simulation model is descried and the numerous physical mechanisms which are included in it are illustrated.
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Electrical breakdown in vacuum interrupters
IEEE Transactions on Electrical Insulation, 1993Aspects of HV breakdown associated with vacuum interrupters are discussed, based on the author's personal experience. In particular, cold cathode arc stability, electrical contact phenomena, and particle effects are considered. >
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