20th International Symposium on Discharges and Electrical Insulation in Vacuum
Cơ quản chủ quản: N/A
Các bài báo tiêu biểu
Source of metal ions with a variable velocity
- Trang 674-677
Results of the time-of-flight measurements of the cathode plasma jet velocity in
a low voltage vacuum spark are presented. It is found that the mean velocity of
plasma jet is variable at a wide range of values. When the discharge current is
enhanced from 0.6 kA up to 11 kA, the velocity of plasma jet at a distance of 35
cm from the copper cathode is risen linear from 2-10/sup 6/ cm/s up to 7-10/su...
#Cathodes #Plasma measurements #Capacitors #Velocity measurement #Plasma sources #Sparks #Vacuum arcs #Current measurement #Anodes #Delay
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
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
Enhanced emission mode of a ferroelectric plasma cathode
- Trang 319-322
An enhanced emission mode has been observed in a ferroelectric plasma cathode
based on BaTiO/sub 3/ ceramics. The enhanced emission is achieved by the
generation of a dense plasma (10/sup 13/-10/sup 14/ cm/sup -3/). The mechanism
of the plasma formation was studied. Generation of an electron beam with current
amplitude up to 2.5 kA is demonstrated.
#Ferroelectric materials #Cathodes #Electrodes #Electron beams #Plasma density #Surface discharges #Acceleration #Voltage #Current density #Plasma applications
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
Các phim PVD có mặt phẳng phân cách bằng kim loại Dịch bởi AI
- Trang 265-266
Trong bài báo này, chúng tôi mô tả những nỗ lực cải thiện đặc tính hiệu suất của
các bộ phận hoạt động trong cặp trượt bằng cách tạo ra các cấu trúc bề mặt 3
chiều. Trái ngược với các phim đa lớp nổi tiếng, chúng tôi đã tạo ra cấu trúc bề
mặt 3D thực sự bao gồm phim gốm cứng đa lớp có mặt phẳng và được ngăn cách bằng
kim loại nguyên chất (bộ phân cách kim loại), chẳng hạn như đồng và bạc. Để lắng
...
#Xơ vữa động mạch #Bộ phận phân cách #Tính chất huyết tương #Cấu trúc bề mặt #Đồng #Bạc #Hình dạng #Thử nghiệm #Đánh giá hiệu suất #Ma sát
Influence of the angular distributions of the cathode ions on the current flow regime in a high current vacuum arc
- Trang 206-209
The work considers the influence of the angular distribution of cathode ions on
parameters of the vacuum arc. It is shown that mutual collisions of the fast
ions flowing from different cathode spots at a current density typical for a
high current arc can result in a high ion temperature value at the cathode
plasma boundary. The limit for a current density at a stable current flow region
versus the...
#Cathodes #Current density #Plasma temperature #Vacuum arcs #Fires #Anodes #Plasma density #Plasma stability #Hydrodynamics #Equations
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
Limiting electric strength of vacuum electrode systems including combined breakdown
- Trang 190-193
There exists three types of emission sites, eventually being a place of
initiation of electric breakdown in vacuum switching devices with a screened
insulator. Using electrostatic field calculations, potential breakdown paths,
which start at the emission site in a vacuum interrupter, have been analyzed.
Combined breakdown includes a breakdown path across two vacuum gaps and
formation of flashover ...
#Vacuum breakdown #Vacuum systems #Electrodes #Electric breakdown #Breakdown voltage #Dielectrics and electrical insulation #Interrupters #Testing #Electrostatics #Flashover
Dielectric strength of the vacuum interrupter sections after termination of the electric life
- Trang 376-379
The dielectric strength of the vacuum interrupter (VI) sections is studied after
termination of the electric life. It is shown the reduction of the electric life
occurs in particular cases and its reason is the appearance of more low voltage
breakdowns called as "slow" because of increasing almost by an order the time of
the voltage drop to zero during breakdown (several microseconds against
fract...
#Dielectric breakdown #Interrupters #Circuit testing #Breakdown voltage #Vacuum breakdown #Dielectrics and electrical insulation #Electric breakdown #Vacuum arcs #Laboratories #Lightning