Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319)
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Experimental study of dielectric response in tetrahydrofuran and 2,5-dimethylfuran using time domain reflectometer
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 358-360
The time domain reflectometer (TDR) has been used for the experimental study of permittivity and dielectric loss for tetrahydrofuran and 2,5-dimethylfuran. The observed data in time domain has been transformed to frequency domain using Fourier transform method. We have also evaluated the relaxation time using distribution of relaxation time mechanism at different temperatures. The entropy, enthalp...... hiện toàn bộ
#Frequency #Dielectric measurements #Educational institutions #Dielectric losses #Temperature distribution #Reflection #Fourier transforms #Least squares methods #Coaxial components #Military standards
Stochastic model of breakdown initiation in dielectric liquids under AC voltage
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 115-118
The electric strength of perfluorodibutyl ether and transformer oil in small gaps between hemispherical electrodes was investigated experimentally under an AC voltage of linearly increasing amplitude. The influence of the radius of the hemispherical electrodes, gap lengths and also rate of voltage increase on probability of breakdown initiation was investigated. In the macroscopic stochastic appro...... hiện toàn bộ
#Breakdown voltage #Stochastic processes #Dielectric breakdown #Dielectric liquids #Electrodes #Electric breakdown #Petroleum #Hydrodynamics #Helium #Computer simulation
Application of neural networks paradigms in the diagnosis and thermal ageing prediction of transformer oil
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 258-261
In this paper we present the application of some artificial neural networks algorithms to the diagnosis and thermal ageing prediction of transformer oil. The simulation had been validated by experimental results.
#Neural networks #Intelligent networks #Aging #Oil insulation #Power transformer insulation #Petroleum #Laboratories #Costs #Dielectrics and electrical insulation #Thermal engineering
Spectroscopic investigation of electrical discharges in liquids
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - 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
Stochastic model of streamer growth in dielectric liquids with hydrodynamic expansion of streamer channels
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 111-114
A stochastic model of streamer propagation in dielectric liquids was developed. A simple approximate model is proposed that enables one to calculate the pressure in a cylindrical channel using the expansion velocity. A three-dimensional model for the simulation of streamer growth was realized which takes into account the first approximation expansion of the streamer channels.
#Stochastic processes #Dielectric liquids #Hydrodynamics #Electrodes #Voltage #Fluctuations #Lattices #Dielectric breakdown #Shock waves #Equations
Influence of hydrostatic pressure on the characteristics of discharges propagating on solid/liquid insulating interfaces under AC and DC voltages
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 207-210
This paper is aimed at the influence of the hydrostatic pressure on the discharge propagating at the liquid/solid insulating interfaces under AC and DC voltages using a point-plane electrode arrangement. It is shown that different shapes of creepage discharges and associated currents can be initiated for the same experimental conditions indicating the existence of different propagation modes of di...... hiện toàn bộ
#Solids #Voltage #Electrodes #Power transformer insulation #Dielectric liquids #Surface discharges #Oil insulation #Optical propagation #Safety #Minerals
Dielectric measurements on cryogenic insulation systems
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 225-227
For the operation of high temperature superconducting (HTS) devices liquid nitrogen (LN2) is necessary to cool the HTS conductor down to the operating temperature of about 77 K. Depending on the application in electrical power systems and high voltage devices, LN2 is also an attractive dielectric liquid. Some prototypes of cables, power and traction transformers and current limiters were built, bu...... hiện toàn bộ
#Dielectric measurements #Cryogenics #Dielectrics and electrical insulation #High temperature superconductors #Temperature dependence #Superconducting cables #Aging #Superconducting devices #Nitrogen #Conductors
Microbubbles and breakdown initiation in water
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 127-130
Air microbubbles with a size of 30-100 microns in water are formed with the help of a pulse-heated up wire electrode. Prebreakdown time lag with the presence of bubbles was significantly less than in the case of their absence. In the case of anode initiation, three different shock waves following one each other were observed. These shock waves were connected to the appearance and movement of super...... hiện toàn bộ
#Electric breakdown #Optical pulse generation #Shock waves #Anodes #Breakdown voltage #Electric shock #Cathodes #Dielectric liquids #Optical pulses #Cameras
Thử nghiệm điện áp cao trên các mẫu ngắn của cáp truyền tải siêu dẫn công suất cao 110 kV sử dụng cơ sở HAIhKE Dịch bởi AI
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 186-189
Các thành phần cơ bản của cáp truyền tải điện siêu dẫn nhiệt độ cao đã được phát triển trong khuôn khổ chương trình R&D dưới sự lãnh đạo của Tập đoàn Siemens. Để thử nghiệm và lựa chọn cách điện điện áp cao, một dielectrics rắn được ngâm tẩm bằng nitơ lỏng đã được chế tạo, cơ sở thử nghiệm HAIhKE (Hochspannungs-Anlage zur Isolationsprufung an hochtemperatursupraleitenden Kabelkurzproben fur die En...... hiện toàn bộ
#Cáp siêu dẫn #Điện áp #Siêu dẫn nhiệt độ cao #Cáp truyền tải siêu dẫn #Thử nghiệm cách điện #Điện môi và cách điện điện #Lỏng điện môi #Nitơ #Tiêu chuẩn IEC #Tổn thất điện môi
Freeing power transformers from gassing and aging of oil
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 274-278
While the gassing of oil, as determined by periodic dissolved gas analysis (DGA), is attributed to an incipient electrical failure, for the gradual deterioration of paper insulation its aging process is considered to be responsible. These deficiencies, both of which negatively affect the service reliability of high voltage power transformers, are currently perceived as two independent phenomena. I...... hiện toàn bộ
#Power transformers #Aging #Petroleum #Dissolved gas analysis #Dielectrics and electrical insulation #Gas insulation #Oil insulation #Power transformer insulation #Laboratories #Monitoring
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