Results 161 to 170 of about 457,205 (201)
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2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV), 2016
The objective of this paper is to experimentally investigate the distribution of high-voltage and high-frequency (HVHF) impulse breakdown sparks in conditioned contact surface. A 10 kV commercial vacuum interrupter (VI) is used, which is machined with a glass envelope and an observing window on the main shield.
Xiaoshe Zhai +6 more
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The objective of this paper is to experimentally investigate the distribution of high-voltage and high-frequency (HVHF) impulse breakdown sparks in conditioned contact surface. A 10 kV commercial vacuum interrupter (VI) is used, which is machined with a glass envelope and an observing window on the main shield.
Xiaoshe Zhai +6 more
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IEEE Transactions on Dielectrics and Electrical Insulation, 2015
The objective of this paper is to investigate the effect of a high-frequency high-voltage impulse conditioning technique on the inrush current interruption phenomena. In this paper, the inrush current interruption phenomena referred to the actual interruption and the currentless period following interruption. First, Six 7.2 kV vacuum interrupters (VIs)
Yingyao Zhang +4 more
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The objective of this paper is to investigate the effect of a high-frequency high-voltage impulse conditioning technique on the inrush current interruption phenomena. In this paper, the inrush current interruption phenomena referred to the actual interruption and the currentless period following interruption. First, Six 7.2 kV vacuum interrupters (VIs)
Yingyao Zhang +4 more
openaire +1 more source
Insulation performance of vacuum interrupter after high frequency voltage impulses conditioning
2015 3rd International Conference on Electric Power Equipment – Switching Technology (ICEPE-ST), 2015The conditioning is widely used to enhance the insulation performance of vacuum interrupter, such as current conditioning and spark conditioning. In this paper, we compared the conditioning performance between traditional ones and high frequency voltage impulses conditioning method with their conditioning parameters, such as conditioning voltage ...
Weigang Feng +3 more
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2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV), 2016
Vacuum Interrupters (VI's) which are the product of choice at medium voltages for interruption of fault currents are being actively considered and applied at transmission levels also. As the voltage levels increases, so do the stresses. Hence, the high voltage withstand performance of the vacuum interrupter becomes extremely significant and demands ...
Sandeep Kulkarni +3 more
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Vacuum Interrupters (VI's) which are the product of choice at medium voltages for interruption of fault currents are being actively considered and applied at transmission levels also. As the voltage levels increases, so do the stresses. Hence, the high voltage withstand performance of the vacuum interrupter becomes extremely significant and demands ...
Sandeep Kulkarni +3 more
openaire +1 more source
Simulation of Earthing Systems Under High Impulse Conditions
2006 IEEE 8th International Conference on Properties and applications of Dielectric Materials, 2006Several models of earthing systems under high impulse conditions, which are in satisfactory agreement to the experimental results, have been proposed in previous studies [1-11]. However, these models do not consider for the effects of current rise time as the voltage levels were increased.
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Journal of Physics D: Applied Physics, 2023
Abstract We report several effects found in reactive bipolar high-power impulse magnetron sputtering (abbreviated as bipolar HiPIMS or BPH) discharges at the substrate level. The role of the negative peak current and the positive pulse voltage, U
M Michiels +5 more
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Abstract We report several effects found in reactive bipolar high-power impulse magnetron sputtering (abbreviated as bipolar HiPIMS or BPH) discharges at the substrate level. The role of the negative peak current and the positive pulse voltage, U
M Michiels +5 more
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AIAA Journal, 2015
A tunable diode laser-based H2O absorption diagnostic has been developed to characterize transient phenomena within the Stanford Expansion Tube Flow Facility. A measurement rate of 25 kHz was achieved to identify and investigate transient flow structures within the ∼600 μs facility test time.
Christopher L. Strand, Ronald K. Hanson
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A tunable diode laser-based H2O absorption diagnostic has been developed to characterize transient phenomena within the Stanford Expansion Tube Flow Facility. A measurement rate of 25 kHz was achieved to identify and investigate transient flow structures within the ∼600 μs facility test time.
Christopher L. Strand, Ronald K. Hanson
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2015 IEEE Eindhoven PowerTech, 2015
High voltage bushing forms an essential part of a power transformer and its insulation condition is of high importance in a transformer's reliability. Transformer failure statistics indicate considerable contribution from bushing failures, which makes the monitoring of power transformer bushings essential.
Roya Nikjoo, Nathaniel Taylor, Hans Edin
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High voltage bushing forms an essential part of a power transformer and its insulation condition is of high importance in a transformer's reliability. Transformer failure statistics indicate considerable contribution from bushing failures, which makes the monitoring of power transformer bushings essential.
Roya Nikjoo, Nathaniel Taylor, Hans Edin
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Electrical Engineering, 2016
In a previously published work, performances of three practical earthing systems consists of 2, 3 and 4 rod-bed electrodes buried at the same site, thus the same soil resistivity were investigated. It was found that the degree of reduction of the earth resistance values is the highest in the poor earthing systems (2 rod electrodes).
Abdullah, Saleha +2 more
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In a previously published work, performances of three practical earthing systems consists of 2, 3 and 4 rod-bed electrodes buried at the same site, thus the same soil resistivity were investigated. It was found that the degree of reduction of the earth resistance values is the highest in the poor earthing systems (2 rod electrodes).
Abdullah, Saleha +2 more
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IEEE Transactions on Plasma Science, 2016
The objective of this paper is to investigate an influence of high-frequency high-voltage impulse conditioning on the back-to-back capacitor bank switching performance of vacuum interrupters (VIs). Nine identical 7.2-kV VIs were tested by 80 CO operations after the proposed conditioning. Test inrush currents were set to 0-, 2-, and 5-kA peak.
Yingyao Zhang +6 more
openaire +1 more source
The objective of this paper is to investigate an influence of high-frequency high-voltage impulse conditioning on the back-to-back capacitor bank switching performance of vacuum interrupters (VIs). Nine identical 7.2-kV VIs were tested by 80 CO operations after the proposed conditioning. Test inrush currents were set to 0-, 2-, and 5-kA peak.
Yingyao Zhang +6 more
openaire +1 more source