The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
SF6 has been widely used as insulating and arc-extinguishing medium in power equipment. Under discharges, lower fluorides of sulfur generated by the dissociations of SF6 will react with unavoidable moisture and oxygen to form corrosive byproducts (etc., SOF2, SO2F2, SOF4). These byproducts will reduce the insulating and arc-quenching capacity of SF6 power equipment, so it is necessary to study their...
Vacuum degree online detection of vacuum interrupter has been investigated for more than 50 years. But, there is still no perferable means can be used to practical application. The change rules of Cu, H spectral lines intensities with pressure have been investigated in this paper. Further, the laser-induced plasma temperature and density are calculated using Boltzmann slope method and Stark broadening...
When SF6 was designated as a green house gas to be reduced, there has been a wish to use an alternative insulating gas to replace pure SF6 gas. And a fluoroketon, C5F10O attracts great attention as a potential substitute. In this paper, the breakdown characteristics of C5F10O/CO2 as mixtures in nonuniform electric filed and the variation of the mixing ratio with elevation were studied. The positive...
SF6 has been widely used in electrical industry because of its excellent electrical capabilities. However, due to its extremely high Global Warming Potential (GWP), researchers have done lots of investigations on SF6 alternative gases during the last few decades. Unfortunately, all the substitutions have their own drawbacks and limitations and can't be applied in practice. In this paper, the critical...
It's increasing clear that departures from both thermal and chemical equilibrium exist in conditions relevant to high-voltage circuit breakers after current zero. The electron temperature (Te) is often higher than the heavy species temperature (Th). We are intended to investigate the effects of N2 contents on the electron temperature and non-equilibrium composition during the arc decaying process,...
The paper conducts a simulation analysis on the electric field contribution of leading-out terminal based on the long running semi-insulating switchgear. The electric field distribution of leading-out terminal is obtained by using electrostatic field analysis with the software, ANSYS. The effects of water and dust are simulated by changing the dielectric constant of air considering the unpurified...
The analysis technique of main SF6 decomposition products (etc. SOF4 and SO2F2) is expected to compensate for the ultra-high frequency (UHF) method in partial discharge (PD) diagnosis and insulation condition monitoring of power equipment. SOF4 and SO2F2 as well as other corrosive byproducts derived from the reactions of SF6 dissociation species (e.g., SF2, SF3 and SF4) with the trace impurities of...
He+O2 atmospheric-pressure cold plasmas have received much attention; mainly rely on the potential use of reactive oxygen species generated in such plasmas. In this paper we present the impact of oxygen concentration from 0ppm to 5% on the discharge modes, power dissipation, chemical composition and electrode fluxes of plasma species in He+O2 atmospheric-pressure cold plasmas with a constant power...
Data mining is a new type of information processing technology. The use of data mining technology in online audit will improve the auditing efficiency and auditing quality, reduce the audit risk, and can provides new powerful weapons for anti-fraud of auditors. Data mining process in online audit includs: auditors putting forward demand, data preparation, data mining and result analysis. The basic...
In recent years, a growing amount of literature suggests that the bactericidal effect of low-temperature atmospheric-pressure plasmas is chemistry driven. Antibacterial species generated by plasmas, such as O, OH, 1O2, and H2O2, are capable of reacting strongly to the substance in bacteria, resulting in bacterial inactivation. However, since bacteria cells are usually embedded in solution/tissue in...
Cold atmospheric-pressure plasmas have received much attention; mainly rely on the potential use of reactive species generated in such plasmas. In most cases of application, such as plasma medicine, the reactive species have effects on a sample only after their penetration through the plasma sheath that is formed above the sample. In contrast to studies of generation and optimization of reactive species...
With the development of computer technology, network-technology,information technology and accounting-informationization, audit methodologies and models are also advancing along with the times. Continuous auditing (CA), as a pattern of auditing based on the network information- technology, is the direction of the development of intenal auditing in enterprise groups.
Data mining is a new type of information processing technique. The use of data mining technique will improve the efficiency of the enterprise group's internal auditing and auditing quality, and reduce the audit risk. We reconstruct enterprise group internal audit model based on data mining and other techniques, and show the data mining process in the internal auditing of enterprise groups. The basic...
A valve-less piezoelectric pump with hackle chamber (HC) is presented. The chamber bottom of the pump is designed as a waves shape. The HC and the opposite piezoelectric vibrator constitute a series of hackle shape ducts in the chamber. Different flow resistances are produced between the suction stroke and the discharge stroke of the pump. The different flow resistances will generate net flow when...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.