Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319)
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Bragg curve spectrometry for /sup 16/O and /sup 20/Ne of around 100MeV/n using an allene doped liquid argon gridded ionization chamber
- Trang 412-415
Bragg curves for /sup 16/O and /sup 20/Ne of around 100 MeV/n were obtained from observation of the time variations in the anode signal of an allene doped liquid argon gridded ionization chamber. The results showed good agreement with those obtained from simulation. This method was applied to the analysis of deformation in the Bragg curve due to nuclear reactions in liquid argon. As a result of us......
#Spectroscopy #Argon #Pulse shaping methods #Shape #Radiative recombination #Spontaneous emission #Ionization #Electrons #Temperature #Molecular sieves
Digital simulation of electromagnetic flowmeter for insulating liquids
- Trang 309-311
This paper presents a digital simulation for a electromagnetic flowmeter which could be used for conducting, low conducting and non-conducting liquids. The digital simulated results show that the low level flow signal could be recovered in the high level background noise associated with the low. or non-conducting liquids if a dual frequency driving and the appropriate digital bandpass filters and ......
#Digital simulation #Insulation #Dielectric liquids #Frequency #Magnetic flux #Signal processing #Magnetic separation #Phase detection #Fluid flow measurement #Electromagnetic measurements
Electrical properties of fluorinated gel electrolytes using conducting solution and its application to secondary battery
- Trang 365-368
The lithium ionic electrolytes of fluorinated gel materials have been found to show high ionic conductivity. We proposed the application to a lithium ion secondary battery using this gel electrolyte. Non-crosslinked fluorinated gel materials were prepared by reacting fluoroalkanoyl peroxides with 2-acrylamid-2-methylpropanesulfonic acid (AMPS) oligomer, or 2-glucosyloxyyethyl methacrylate (GEMA) o......
#Conductivity #Lithium #Conducting materials #Electrodes #Battery charge measurement #Solvents #Current measurement #Charge measurement #Constitution #Voltage
Thermalization of low energy electrons in dielectric liquids
- Trang 49-51
An experimental approach to determination of the rate of the electron energy loss has been developed for "hot" electrons in dielectric liquids. It is based on the measurements of d.c. two pulse photoconductivity of liquid solutions: at first, the UV laser pulse generates geminate electrons, trapped near their parent cations, through two photon ionization of admixed aromatic molecules, and then the......
#Dielectric liquids #Pulse measurements #Optical pulse generation #Electron traps #Photoconductivity #Energy loss #Dielectric measurements #Ionization #Probes #Wavelength measurement
Study of orientation of liquid crystal molecules at interface by shear horizontal wave
- Trang 386-389
The director-orientation of a liquid crystal near an interface between a glass plate and a liquid-crystal layer is studied under propagation of a shear horizontal (SH) acoustic wave. An acoustic phase-delay of a SH wave device with various liquid-crystal director orientations, which is affected by the liquid-crystal director orientation, is measured. The fractional velocity change of the SH wave i......
#Liquid crystals #Acoustic waves #Liquid crystal devices #Glass #Acoustic propagation #Acoustic devices #Acoustic measurements #Phase measurement #Numerical analysis #Voltage
Experience with UHF partial discharge measurements
- Trang 239-241
Some tests on UHF measuring techniques on transformers and oil-paper insulation models have been reported in literature. The results indicate the feasibility of this method for oil-paper insulation, but are not conclusive. To have a good perspective of this method, UHF partial discharge (PD) measurements were conducted on small oil-paper insulation models, large transformer windings and PD suspect......
#Partial discharge measurement #Partial discharges #Fault location #UHF measurements #Acoustic measurements #Oil insulation #Power transformer insulation #Acoustic signal detection #Insulation testing #Windings
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
PD signatures of wedge type discharges in transformer insulation
- Trang 211-214
Discharge signatures have been studied in a combined transformer oil/impregnated paper insulation system subjected to AC high voltage. A semi-homogeneous sphere-plane electrode configuration was used to simulate wedge discharges in a power transformer. The moisture level of the impregnated paper was varied between 0.3% and 9.6%. At the highest moisture level no discharges were observed before brea......
#Power transformer insulation #Partial discharges #Power transformers #Oil insulation #Petroleum #Electrodes #Moisture #Testing #Power measurement #Geometry
Strength investigations on long oil gaps
- Trang 228-230
We deal with the electrical strength properties of oil gaps. The investigations were carried out with uniform electrical fields and electrode distances up to 30 mm. Measurements were performed with alternating current (50 Hz), lightning impulses and switching impulses. Such investigations usually have a relative high dispersion of the measurement values. It will be shown that it is possible to min......
#Petroleum #Testing #Electrodes #Breakdown voltage #Electric breakdown #Dispersion #Security #Safety #Gaussian distribution #Shape measurement
Performance and new application of ester liquids
- Trang 203-206
The combination of solid and liquid insulation is the most utilised insulation system in high voltage apparatus, where the insulation consists of impregnated solid material and the demand on heat transfer is not negligible. The requirements on the liquid part of the insulation system are not only the electric and dielectric performance but also the performance regarding environmental requirements ......
#Dielectric liquids #Dielectrics and electrical insulation #Dielectric loss measurement #Minerals #Petroleum #Solids #Voltage #Dielectric materials #Heat transfer #Soil