20th International Symposium on Discharges and Electrical Insulation in Vacuum
Cơ quản chủ quản: N/A
Các bài báo tiêu biểu
Identification of defects in extinguishing vacuum chamber based on analysis of parameters describing PD distributions
- Trang 543-546
The paper describes the method of defects identification in the extinguishing
chamber of a vacuum interrupter. The method basis on analysis of parameters
describing frequency-amplitude distribution and frequency-phase distribution of
charge carried by partial discharges generated by defects.
#Insulation #Partial discharges #Surface discharges #Surface treatment #Vacuum breakdown #Fault location #Switches #Vacuum systems #Surface contamination #Vacuum technology
Peculiarities of nonsustained disruptive discharges at interruption of cable/line charging current
- Trang 351-354
It has been found out that NSDD probability increases at cable/line charging
current interruption compared with no-load test. This fact has been explained by
formation of contact welds at closing of the preliminary charged cable/line.
These welds being torn apart at the following contact partition may serve as a
source of macroparticles or surface irregularities resulting in increased
probability ...
#Circuit testing #Electric breakdown #Voltage #Probability #Contacts #Surges #Hafnium #Surface charging #Surface discharges #Fault location
Vacuum electrical breakdown characteristics of oxygen-free copper electrodes processed by precision machining
- Trang 556-559
Vacuum breakdown characteristics of oxygen-free copper electrodes processed by
precision machining were investigated by applying impulse voltage As a result,
processed electrodes by precision machining showed higher conditioning effect
than those of electrodes without the process. And the conditioning was achieved
with less number of breakdowns. Accordingly the precision machining and the
subseque...
#Vacuum breakdown #Electric breakdown #Copper #Electrodes #Machining #Breakdown voltage #Annealing #Hydrogen #Surface treatment #Sputtering
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
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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
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
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
Comparison of the properties of WCAg and WCCu as contact materials for vacuum contactors
- Trang 247-253
WCAg has become one of the preferred contact materials in vacuum contactors for
switching load currents of some hundred Amperes up to a few kiloamperes. It
meets the requirements of vacuum contactors such as low erosion losses, low
chopping currents, a sufficient quenching capability etc. Today's efforts try to
reduce the percentage of the expensive silver component in this material or to
substitu...
#Contactors #Circuit testing #Silver #Optical wavelength conversion #Voltage #Current measurement #Impedance measurement #Frequency measurement #RLC circuits #Resonant frequency
Secondary gap plasma: origin and resulting effects
- Trang 52-59
Substantiation is given to the statement that the steady burning of a
high-current vacuum arc (HCVA) calls for the presence of a sufficiently high
concentration of the secondary plasma (SP) in the interelectrode gap (as
distinct from the primary plasma of cathode jets). The efficiency of possible SP
sources is analyzed. The basic SP source is shown to be the anode that emits
atoms under the action...
#Plasma sources #Vacuum arcs #Cathodes #Anodes #Plasma density #Plasma materials processing #Electrodes #Electrons #Magnetic fields #Magnetic materials
Breakdown delay in vacuum
- Trang 654-659
The results of theoretical and experimental study of breakdown delay in vacuum
are presented. It is shown that processing of vacuum gap electrodes by
high-voltage pulses with duration equal to breakdown delay time realizes the
optimum mode providing an electric strength maximum at minimal duration of
conditioning process. The regime of cathode treatment by high-voltage pulses
with duration equal t...
#Vacuum breakdown #Delay effects #Cathodes #Electric breakdown #Breakdown voltage #Pulse amplifiers #Electrodes #Delay estimation #Surface treatment #Dielectrics and electrical insulation