Results 41 to 50 of about 8,848 (229)
Methods for estimation of the vacuum status in vacuum circuit breakers [PDF]
IEEE Transactions on Dielectrics and Electrical Insulation, 1999 In this paper several methods are described for the estimation of the pressure inside vacuum interrupters which have been in operation for many years. The methods are applicable without demounting the interrupters and use only electrical measuring techniques.
Merck, W.F.H. +3 more
openaire +2 more sources
High Voltage, EarlyView.ABSTRACT This paper presents a simplified equivalent circuit model (ECM) for the post‐arc sheath stage in DC vacuum circuit breakers and outlines the method for calculating circuit parameters using the particle‐in‐cell Monte Carlo collision (PIC‐MCC) method. The post‐arc sheath is modelled as a parallel combination of a variable resistor and a variable
Xubin Li +5 more
wiley +1 more source
Surface Micro‐Discharge Plasma for Multiple Teeth Bleaching: Efficacy, Mechanism and Safety
High Voltage, EarlyView.ABSTRACT Hydrogen peroxide (H2O2) is the commonly‐used bleaching chemical in clinical practice, but its excessive concentrations can cause tooth damage. Atmospheric pressure cold plasma is considered a promising new technique for tooth bleaching. Surface micro‐discharge (SMD) devices can generate large‐scale plasma, which holds potential for treating ...
Ruike Chen +7 more
wiley +1 more source
Integration and Conventional Systems at STAR
, 2002 At the beginning of the design and construction of the STAR Detector, the collaboration assigned a team of physicists and engineers the responsibility of coordinating the construction of the detector.
Ackerman +9 more
core +4 more sources
The measurement of very low conductivity and dielectric loss in XLPE cables: A possible method to detect degradation due to thermal aging [PDF]
, 2011 The dielectric response of crosslinked polyethylene (XLPE) insulated, miniature power cables, extruded with inner and outer semicons, was measured over the frequency range 10-4 to 104 Hz at temperatures from 20 to 100 °C.
Dissado, L. A. +4 more
core +1 more source
High Voltage, EarlyView.ABSTRACT Large‐capacity generator circuit breaker (GCB) based on vacuum interrupter technology is the key power equipment to ensure the safe operation of the power system. When the short‐circuit current was forced to cross zero, the large‐capacity GCB was difficult to generate a zero‐voltage environment through freewheeling, the vacuum interrupter (VI)
Xiangyu Han +8 more
wiley +1 more source
Results in EngineeringPermanent magnet actuators are widely used in fields requiring precise and reliable motion control, such as valves, pumps, and switches. They have also been extensively applied in vacuum circuit breakers, particularly in high- and medium-voltage ...
Guanbao Zeng +3 more
doaj +1 more source
Switching transients caused by vacuum circuit breakers in collection grids of offshore wind farms
Wind Energy, 2021 In this study, transients that can occur in the collection grids of offshore wind farms were investigated. On the basis of the multiple prestrike and reignition model that can reflect the actual operation of a vacuum circuit breaker (VCB), a switching ...
Jiayuan Tao +6 more
doaj +1 more source
Effect of Magnetic Field on Different Opening Processes of Multi-Break Vacuum Gaps
IEEE Access, 2021 Vacuum gap saturation of single break can be solved by multiple breaks in series. In different breaking processes, the unbalanced energy and charges injected into the breaks lead to unbalanced voltage distribution.
Hao Zhang +5 more
doaj +1 more source
Comparison of Dielectric Recovery After Arc Burning in SF6 Gas and Its Potential Alternatives
High Voltage, EarlyView.ABSTRACT Although sulphur hexafluoride (SF6) exhibits exceptional insulating properties, it is a potent greenhouse gas. Therefore, studying alternatives to SF6 is critical for developing environmentally friendly high‐voltage electrical equipment.
Ziqi Liu +4 more
wiley +1 more source