Results 211 to 220 of about 448 (266)
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2008 23rd International Symposium on Discharges and Electrical Insulation in Vacuum, 2008
The results of switching tests of a DC vacuum circuit-breaker designed for rated voltage 3.3 kV and rated current 3000A are presented. The circuit-breaker is intended for current interruption in the networks with fault currents up to 30 kA. To interrupt the direct current, the authors used a method of artificial current transition through zero in the ...
D. Alferov +5 more
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The results of switching tests of a DC vacuum circuit-breaker designed for rated voltage 3.3 kV and rated current 3000A are presented. The circuit-breaker is intended for current interruption in the networks with fault currents up to 30 kA. To interrupt the direct current, the authors used a method of artificial current transition through zero in the ...
D. Alferov +5 more
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IEEE Transactions on Power Apparatus and Systems, 1972
The effectiveness of the commutation principle, using vacuum interrupters as a means for interrupting high direct current at high voltage, has been demonstrated convincingly by a large number of tests. Currents in excess of 15 kA at 20 kV have been interrupted by a single device in an inductive circuit.
A. Greenwood, P. Barkan, W. Kracht
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The effectiveness of the commutation principle, using vacuum interrupters as a means for interrupting high direct current at high voltage, has been demonstrated convincingly by a large number of tests. Currents in excess of 15 kA at 20 kV have been interrupted by a single device in an inductive circuit.
A. Greenwood, P. Barkan, W. Kracht
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Estimation of vacuum condition in vacuum circuit breakers
Proceedings ISDEIV. 18th International Symposium on Discharges and Electrical Insulation in Vacuum (Cat. No.98CH36073), 2002In this paper a method is described for the estimation of the pressure inside vacuum circuit breakers which have been in operation for several years. The method is applicable for measurements in the field and uses only electrical measurement techniques.
Merck, W.F.H. +2 more
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Vacuum-state estimation of vacuum circuit breakers
SPIE Proceedings, 1994The vacuum state of vacuum switching elements after production is checked normally by Penning- or Magnetron methods (combined electrical and magnetic field). Vacuum in the range of 10-1 - 10-4 Pa can be measured in this way. After assembly into circuit breakers however, these methods are not applicable.
Damstra, G.C. +2 more
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A Guide to the Application of Vacuum Circuit Breakers
IEEE Transactions on Power Apparatus and Systems, 1971The paper shows that the vacuum circuit breaker is well suited for the duties that a circuit breaker must perform. Reasonable care must be taken under certain circumstances when applying these breakers. Such applications are identified and simple corrective measures are proposed.
A. Greenwood, D. Kurtz, J. Sofianek
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The design of a 245kV vacuum circuit breaker
2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV), 2016This paper covers work carried out on the electrical design for a 245kV Vacuum Circuit Breaker, specifically the design of the Vacuum Interrupters. The design is based on a âTâ style transmission breaker, with two Vacuum Interrupters in series. The VCB uses a single permanent magnetic actuator with a toggle mechanism to provide the opening and closing ...
L. T. Falkingham +2 more
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High voltage vacuum circuit breakers
IEEE Transactions on Power Apparatus and Systems, 1975A new line of high voltage vacuum power circuit breakers is being developed for 121 kV and above and will use the new vacuum interrupter module presented in a companion paper3. The first ratings in production will be 242 kV with interrupting capabilities of 40,000 amperes, followed by breakers rated 50,000 amperes; both of these will have continuous ...
R.B. Shores, V.E. Phillips
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Interruption life of vacuum circuit breakers
Proceedings ISDEIV. 19th International Symposium on Discharges and Electrical Insulation in Vacuum (Cat. No.00CH37041), 2002Over the past few years, there has been an increased interest in the number of short circuit interruptions a vacuum circuit breaker is capable of before excessive wear occurs on the contacts. Several methods have been proposed for recording or extrapolating the interruption life of vacuum circuit breaker contacts and these have resulted in many ...
P.N. Stoving, J.F. Baranowski
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Continuous vacuum monitoring in vacuum circuit breakers
2014 International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV), 2014Vacuum presence monitoring is a routine maintenance procedure carried out on vacuum circuit breakers, in which the CB is isolated from the electrical network. The presence of the vacuum is verified by applying a voltage across the open contacts of the vacuum interrupters VI's higher than the breakdown voltage of such contacts in air. This procedure has
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