20th International Symposium on Discharges and Electrical Insulation in Vacuum
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Các bài báo tiêu biểu
Temporal characteristics of charged particle flows in a low current vacuum arc
- Trang 560-563
Temporal measurements of ion flow emanating from area of a vacuum arc with use single-channel electrostatic energy-analyzer combined with time-of-flight mass-analyzer were carried out. As a result, the following features of the ionic flow were revealed: the ionic flow represents a sequence of intensive bundles; and the charging composition of a flow strongly varies from emission to emission.
#Vacuum arcs #Electrostatic analysis #Cathodes #Time measurement #Electrodes #Anodes #Radiation detectors #Signal resolution #Electrostatic measurements #Energy measurement
Diagnostics of laser-induced spark discharges in air and vacuum
- Trang 564-567
In the authors' work, they present the results of their studies of self-channeling processes generated by interaction of an intense laser pulse (10/sup 15/ W/cm/sup 2/) with metallic and double-layer targets both in gas atmosphere and in vacuum. They report about measurements of intense X-ray radiation, the evolution of the plasma density in laser-produced plasmas by means of pulsed interferometry......
#Sparks #Optical pulse generation #X-ray lasers #Plasma measurements #Plasma density #Gas lasers #Pulse measurements #Plasma x-ray sources #Radiation detectors #X-ray detection
The characteristics of the vacuum arc and the interruption ability on the high-speed vacuum circuit breaker
- Trang 435-438
A high-speed vacuum circuit breaker, which forced a fault current to zero, has been investigated. The characteristics of the arc behavior and the interruption ability were investigated experimentally. Two types of electrode, an axial magnetic field electrode and a disk-shaped electrode, were tested. The results demonstrate the characteristics of the arc behavior and the interruption ability of the......
#Electrodes #Circuit testing #Voltage #Fault currents #Vacuum arcs #Frequency #Circuit breakers #Circuit faults #Interrupters #Magnetic fields
Short-line fault interruption capability of vacuum circuit breakers
- Trang 34-37
Current zero measurements are performed during short-line fault interruption tests of vacuum circuit breakers. Various reignition modes (occurring between 0 and 75 ms after current zero) were observed due to insufficient arcing time. The (single) restrike and the (single) failure occurred with higher current than rated. The relationship between post-arc current/charge, reignition mode and TRV are ......
#Circuit faults #Circuit breakers #Circuit testing #Performance evaluation #Voltage #Current measurement #Interrupters #Laboratories #Fault currents #Instrument transformers
Soft X-ray emission in a low-current, repetitive vacuum arc
- Trang 299-302
Soft X-ray emission from a short vacuum gap, operated with arc discharges with a repetitive period of 1-10 microseconds and the peak current of 200 A, was investigated. It was found that the soft X-ray was emitted during the arc phase and in the period between the arc extinction and the subsequent breakdown. The current density at the time of X-ray emission is >10/sup 7/ A/m/sup 2/ at an operating......
#Vacuum arcs #X-ray imaging #Cathodes #Filters #Electrodes #Low voltage #Current density #Fault location #Anodes #Cameras
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
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
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
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
Influence of high energy electrons and protons on secondary electron emission of cover glasses for space solar cells
- Trang 84-87
We measured the secondary electron emission (SEE) of cover glasses for space solar cells by beam blanking scanning electron microscopy (BBSEM) with a Faraday cup. The SEE yield of the cover glass is very important for analyzing the charge profile of the satellite. We observed the SEE of a cover glass coated with ZrO/sub 2/. This cover glass was chosen for the National Space Development Agency of J......
#Electron emission #Protons #Glass #Photovoltaic cells #Electron beams #Satellites #Extraterrestrial measurements #Blanking #Scanning electron microscopy #Testing