20th International Symposium on Discharges and Electrical Insulation in Vacuum
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Các bài báo tiêu biểu
HV dielectric strength of shielding electrodes in vacuum circuit-breakers
- Trang 119-122
The subject of this paper is the HV dielectric strength of shielding and
field-grading electrodes in vacuum circuit-breakers. It describes the effects
exerted by various geometrical parameters, the surface area and the material of
the shielding on the breakdown behavior of shielding. The experiments were
performed with a shielding electrodes model and were carried out under lightning
impulse volta...
#Dielectric breakdown #Electrodes #Circuits #Voltage #Vacuum systems #Solid modeling #Testing #Elementary particle vacuum #Vacuum technology #Dielectric materials
Triggering of pseudospark switches
- Trang 592-594
Investigations of direct (DAD) and pulse auxiliary discharge (PAD) effects on
temporal characteristics and voltage drop of cold cathode thyratrons
(pseudospark switches) TPI-types are carried out. The described investigations
were aimed to obtain reduced energy losses in the discharge and minimize
switching time. The tests were carried out in a mode with anode voltage 3-20 kV,
at anode peak curren...
#Atherosclerosis #Cathodes #Thyratrons #Switches #Anodes #Energy loss #Testing #Delay #Voltage control #Jitter
Dielectric analysis of high voltage metalclad withdrawn switchgear
- Trang 515-518
The breakthrough disruption under adverse circumstances in high voltage
metalclad withdrawn switchgear had happened frequently because of its compact
space size. In this paper, the dielectric properties of 12 kV high voltage
metalclad withdrawn switchgear under three phase and impulse voltage excitation
have been analyzed by calculating the electric field distribution. Through
investigation, the m...
#Voltage #Switchgear #Dielectrics and electrical insulation #Laplace equations #Space technology #Educational institutions #Dielectric measurements #Power measurement #Power system economics #Power generation economics
Investigation of dielectric breakdown probability distribution for double-break vacuum circuit breaker
- Trang 323-326
Breakdown probability distribution before and after no-load switching was
investigated for a vacuum interrupter made from copper-chromium alloy. Since the
multi-break vacuum circuit breaker was considered as a method for realizing a
high-voltage vacuum circuit breaker, a double-break vacuum circuit breaker was
investigated for breakdown probability distribution. Breakdown probability
distribution ...
#Dielectric breakdown #Probability distribution #Vacuum breakdown #Circuit breakers #Interrupters #Copper alloys #Electric breakdown #Weibull distribution #Scattering #Shape
Vacuum-arc plasma source with extended cylindrical cathode
- Trang 618-621
The experimental study of vacuum-arc plasma source with extended cylindrical
cathode is carried out. The plasma source is intended for the protective coating
deposition on articles having the form of closed containers. The plasma source
cathode is fabricated as a cylinder with diameter 60 mm and length 750 mm.
Aluminum is used as cathode material. Inside the cathode there is the
cylindrical space ...
#Plasma sources #Cathodes #Coatings #Containers #Surface discharges #Aluminum #Coils #Steel #Arc discharges #Protection
Characteristics of DC vacuum arc in the transverse axially symmetric magnetic field
- Trang 198-201
The characteristics of a DC vacuum arc in axially symmetric magnetic field under
contact opening are experimentally investigated. The magnetic field is formed
with the help of the constant magnet placed on the side of the fixed contact.
The magnet position is chosen so that near the working area of contacts at
radius /spl ap/12 mm there is mainly a radial component of the magnetic field of
about 1...
#Vacuum arcs #Magnetic fields #Voltage #Cathodes #Anodes #Plasmas #Magnetic switching #Coils #Magnetic shielding #Switching circuits
Three dimensional electric field calculation for vacuum interrupter by boundary element method
- Trang 511-514
The electric field calculation possesses important position in studying on
dielectric and opening properties of vacuum interrupter. In this paper, the
analysis of the three dimensional electrical field of a vacuum interrupter by
the boundary element method (BEM) has been proceeded, the singular integral
which is the fatal problem in BEM has been solved by degenerating element
technique and special...
#Interrupters #Boundary element methods #Integral equations #Laplace equations #Vacuum technology #Dielectrics and electrical insulation #Jacobian matrices #Educational institutions #Boundary conditions #Voltage
Vacuum flashover characteristics of solid CL-polystyrene
- Trang 650-653
Insulator vacuum surface flashover continues to be a limiting factor in high
voltage, high-energy vacuum-to-oil interfaces. CL-polystyrene is being used in
several applications due to its better flashover voltage hold-off. Insulator
stacks, built following J.C. Martin's criteria, require that the material
constant be known as well as the proper time scaling. The authors have performed
a series of ...
#Flashover #Solids #Testing #Electrodes #Insulation #Equations #Low voltage #Performance evaluation #Weibull distribution #Laboratories
Experimental analysis of ion parameters during the forced vacuum arc interruption
- Trang 415-418
The paper presents experimental measuring results of the ion decay time during
the post-arc phase after a forced interruption of diffuse vacuum arc. Arc
current of amplitudes 400 A and 600 A was switched-off using counter-pulse
current with falling rates from 2 A//spl mu/s u to 67 A//spl mu/s in a
laboratory test circuit. The used voltage, current and contact parameters were
representative for a l...
#Vacuum arcs #Circuit testing #Switches #Current measurement #Force measurement #Phase measurement #Time measurement #Switching circuits #Laboratories #Voltage
Evolution of macroparticle temperature in nonequilibrium vacuum arc plasma
- Trang 103-106
The theoretical research of the energy exchange process between metal
macroparticle and nonequilibrium vacuum arc plasma is carried out. Researched
range of plasma parameters was n=(10/sup 15-/10/sup 19/) cm/sup -3/ and T/sub
e/=(1-5) eV, the model macroparticles had radius R=(1-10) /spl mu/m and
velocities V=(1-100) m/s. In the theoretical model the processes of electronic
emission and atom evapo...
#Plasma temperature #Vacuum arcs #Plasma materials processing #Energy exchange #Elementary particle vacuum #Atomic measurements #Temperature distribution #Thermionic emission #Electronics cooling #Aerospace materials