Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319)
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Modeling of electrohydrodynamic flows and micro-bubbles generation in dielectric liquid by lattice Boltzmann equation method
- Trang 45-48
The Lattice Boltzmann Equation (LBE) method was used to simulate a liquid flow with space electric charge. New approach to describe the charge transfer due to convective charge transport was proposed. Simulations of two-dimensional electrohydrodynamic flow showed pulsations caused by the injection of charged blobs and by the hydrodynamic instability of charged jet. Generation and growth of micro-b...... hiện toàn bộ
#Electrohydrodynamics #Dielectric liquids #Lattice Boltzmann methods #Equations #Fluid flow #Space charge #Charge transfer #Hydrodynamics #Electrodes #Voltage
The behaviour of low conducting liquid in modulated electric field
- Trang 425-428
The electrothermoconvective instability of a low conducting liquid in modulated electric field of a plane horizontal capacitor is investigated in the electrohydrodynamic (EHD) approximation for arbitrary field modulation frequencies and various shapes (harmonic and triangular). The charge formation is produced either due to dielectrophoresis or due to the nonhomogeneous conductivity. The Floquet t...... hiện toàn bộ
#Stability #Shape #Conductivity #Frequency #Amplitude modulation #Voltage #Permittivity #Dielectric liquids #Temperature #Capacitors
Technical development and future perspectives on the application and performance of dielectric liquids
- Trang 231-236
In this paper, the recent trends of electrical insulation in liquid dielectrics am described. The development results of the higher stress/compact design equipment, environment-friendly ester-oil, insulation diagnostic technique, higher temperature application, etc., as well as cryogenic electrical insulation are introduced. In particular, it is pointed out that the charge carriers in liquid diele...... hiện toàn bộ
#Dielectric liquids #Dielectrics and electrical insulation #Oil insulation #Power transformer insulation #Power transformers #Stress #Petroleum #Current measurement #Charge measurement #Electric variables measurement
Spectroscopic investigation of electrical discharges in liquids
- Trang 285-288
Prebreakdown phenomena occurring in liquids are linked with emitted light in the UV, visible and IR range. A spectroscopic analysis of this light can be used to evaluate some fundamental parameters of the discharge such as energy of charge carriers, kinetic temperature of neutral molecules, electron density, etc.. In this paper, we describe the main difficulties to overcome to carry out a spectros...... hiện toàn bộ
#Spectroscopy #Plasma temperature #Electrons #Liquids #Kinetic theory #Corona #Gases #Optical propagation #Current measurement #Velocity measurement
Correlations of electron attachment parameters with carcinogenic properties of matter
- Trang 429-432
The distribution of chemicals divided into carcinogens and noncarcinogens over electron attachment rate constant is presented.
#Electrons #Chemical hazards #Cancer #Chemical industry #DNA #Chemical analysis #Bars #Physics #Humans #Genetics
The temperature dependence of the dielectric strength of transformer oil and pressboard insulation at HVDC polarity reversal stress
- Trang 182-185
This work reports on measurements investigating the dielectric strength of insulating oil and Transformerboard, from very low (-20/spl deg/C) to increased temperature (+60/spl deg/C). Different insulation structure models-board puncture and creepage-were stressed with 1 hour DC step-by-step voltage increase of reversed polarity each step, until breakdown. The impact of adhesives and their orientat...... hiện toàn bộ
#Oil insulation #Temperature dependence #Dielectric breakdown #Dielectrics and electrical insulation #Power transformer insulation #HVDC transmission #Stress #Petroleum #Breakdown voltage #Dielectric measurements
Progress of AC breakdown voltage test devices of insulating liquids
- Trang 333-336
The dielectric breakdown testing of insulation liquids has a history of around 40 years. Special demands like the measurement of silicon oils requires the continuous improvement of testing equipment. Several experiments have led to the recognition of how important careful device design is in the reduction of the influence of the test procedure itself on the specimen.
#Dielectric liquids #Circuit testing #Breakdown voltage #Dielectrics and electrical insulation #Dielectric breakdown #Pollution measurement #Batteries #Test equipment #RLC circuits #Silicon
Rapid dissolved gas analysis by means of electrochemical gas sensors
- Trang 325-328
Rapid, introductory analysis of gases dissolved in insulating oil (DGA) carried out in the field can help in effective screening of faulty transformers as well as minimising number of classical laboratory chromatographic DGA tests. It is also crucial for shortening a time gap between oil sampling and its analysis. A novel approach to DGA is presented in this paper. A rapid analysis of oil samples ...... hiện toàn bộ
#Dissolved gas analysis #Gas detectors #Petroleum #Gases #Laboratories #Fault diagnosis #Gas insulation #Oil insulation #Power transformer insulation #Testing
Transport properties of electrons injected in dense noble fluids
- Trang 369-372
The unified theory of electron transport properties of Ar, Kr and Xe in a wide range of densities is under development. The theory takes into account an influence of the density effects well-known for these liquids. The nonmonotonic behavior of electron transport coefficients is described in the framework of this theory.
#Gases #Particle scattering #Polarization #Argon #Electron mobility #Liquids #Spectroscopy #Ionization chambers #Detectors #Atomic measurements
Instability of electrically stressed water droplets in oil
- Trang 220-224
The breakup of water droplets in an electric field has been studied in naphtenic oil as a function of water conductivity and surface tension of the droplets, and frequency and waveform of the applied voltage. The critical breakup field compares well to theoretical values for low voltage frequencies, but large deviations are found for frequencies above 100 Hz. Four different instability modes are o...... hiện toàn bộ
#Petroleum #Surface tension #Frequency #Permittivity #Conductivity #Stress #Conductors #Polarization #Dielectrics #Electrostatics