20th International Symposium on Discharges and Electrical Insulation in Vacuum
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Các bài báo tiêu biểu
Voltage holding and dark currents in the Cadarache 1 MV ion beam facility
- Trang 315-318
We report our experience in obtaining high voltages up to 1 MV required for the
acceleration of D/sup -/ beams. We find that satisfactory voltage holding at
this level can be obtained by adding gas up to a few 10/sup -4/ mb. Obtaining
the required voltage at lower pressures is made cumbersome by the appearance of
leakage (or dark) currents. Since the reduction of the dark current by
conditioning i...
#Voltage #Ion beams #Insulators #Resistors #Acceleration #Dark current #Vacuum systems #Electrostatics #Dielectrics and electrical insulation #Particle beams
Feasilbility study on application of high voltage and high power vacuum circuit breaker
- Trang 275-278
Because of global warming effects, instead of the SF/sub 6/ gas circuit breaker
(GCB), the vacuum circuit breaker (VCB) is considered for use for high voltage
and high power circuit breaker and switchgear and it is considered that VCB will
be used in these application, though some research and development will be
necessary.
#Voltage #Sulfur hexafluoride #Circuit breakers #Electrodes #Vacuum technology #Geographic Information Systems #Gas insulation #Testing #Global warming #Costs
3D finite element simulation and synthetic tests of vacuum interrupters with axial magnetic field contacts
- Trang 463-466
Axial magnetic field improves the interruption ability of vacuum circuit
breakers. It is known that the design influences the axial magnetic field (AMF)
distribution, current distribution and hence the interruption performance. In
this paper, the authors present a numerical and experimental study for several
segmented coil geometries. The numerical study involves three-dimensional AMF
simulations ...
#Finite element methods #Interrupters #Magnetic fields #Circuit simulation #Circuit testing #Circuit breakers #Current distribution #Coils #Geometry #Magnetic analysis
The optimal design parameters selection of permanent actuator for vacuum circuit breaker based on dynamic characteristic analysis
- Trang 584-587
In order to satisfy the closing and opening velocity of vacuum circuit breaker,
it is very important that calculating the dynamic characteristic of permanent
magnet actuator. Basing on the dynamic analysis, the design parameters of
permanent magnet actuator, such as capacitor, actuator winding, nonworking air
gap and other geometry of permanent magnet actuator are optimized in this
article.
#Actuators #Circuit breakers #Permanent magnets #Capacitors #Voltage #Circuit simulation #Differential equations #Electromagnetic forces #Magnetic analysis #Design optimization
Effects of active elements on oxide removal by a vacuum arc
- Trang 107-110
Effects of alkali metal elements on the action of a vacuum arc were studied in
metal surface cleaning. Substances containing these elements were applied in the
form of their aqueous solution to the work piece surface. These substances had
strong influence on surface roughness and cleaning rate. Reduction of surface
roughness and increase of cleaning rate (oxide removal rate) were obtained.
Maximum...
#Vacuum arcs #Rough surfaces #Surface roughness #Surface cleaning #Cathodes #Testing #Steel #Chemical technology #Ionization #Surface discharges
Transport of a vacuum arc produced plasma beam in a magnetized cylindrical duct
- Trang 670-673
The transport of a vacuum arc produced plasma beam along a magnetized
cylindrical duct was studied experimentally. The plasma source consisted of a Sn
or an Al cathode and a 17 mm i.d. annular copper anode through which the plasma
beam entered into the 160 mm diameter and 500 mm length cylindrical duct. Arc
current, I.,,, was in the range of 30-100 A. Three magnetic coils positioned
co-axially wit...
#Vacuum arcs #Plasma transport processes #Particle beams #Ducts #Probes #Plasma sources #Saturation magnetization #Anodes #Magnetic field measurement #Current measurement
Late breakdowns in a vacuum interrupter after switching operations
- Trang 588-591
Experimental analysis of late reignitions in the contact gap of a vacuum
interrupter during current interruption of frequencies from 1.5 to 15 kHz is
presented.
#Vacuum breakdown #Interrupters #Voltage #Switches #Circuit testing #Contacts #Frequency #Vacuum arcs #Current measurement #Switching circuits
Surface treatment of electrodes by intense flows of charged particles as the method for improvement of vacuum insulation
- Trang 147-153
The paper presents the results of investigations of effect of surface treatment
of electrodes with pulsed intensive electron and ion flows on electrical
strength of vacuum insulation. Such a treatment has been shown to allow one to
decrease the prebreakdown currents and to increase the breakdown electric
fields. The mechanisms of this effect are analyzed in the paper.
#Surface treatment #Electrodes #Dielectrics and electrical insulation #Vacuum systems #Fault location #Gases #Cathodes #Anodes #Pulsed power supplies #Electrons
Surface charging by UV irradiation at the alumina RF window
- Trang 331-334
Alumina RF windows are used at high-power RF sources, such as klystrons. The
breakdown of RF windows takes place due to multipactor and flashover events on
the alumina surface. Both multipactor and surface flashover are considered to be
related to the primary electron emission sites, such as the peripheral region of
the alumina (the triple junction) and defects on the surface. Photoelectrons
induc...
#Surface charging #Radio frequency #Ceramics #Optical surface waves #Electron emission #Klystrons #Flashover #Coatings #Electric breakdown #Resonance
Vacuum arcs driven by cross-magnetic fields (RMF)
- Trang 60-66
The principle of controlling a high-current vacuum arc by radial magnetic fields
(RMF) forcing the constricted arc to move, has long been utilised to design
vacuum interrupters. Detailed electrical and optical measurements in conjunction
with FEM-calculations have provided a better physical understanding of the
function of RMF contacts. Arc appearance, arc rotation speed and heating of the
contact...
#Vacuum arcs #Cathodes #Temperature #Magnetic fields #Contacts #Magnetic field measurement #Charge carriers #Contracts #Electromagnetic forces #Interrupters