Results 251 to 260 of about 7,607,101 (286)

Measurement of space charge in polyethylene by thermally stimulated charge decay

Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1976, 1976
Many researchers have investigated the space charge injected into insulators. However, our understanding of space charge phenomena is far from complete. In the present paper, total quantity and mean spatial depth of space charge injected into polyethylene films are measured by the technique of Thermally Stimulated Charge Decay (TSCD).
T. Hino, F. Kaneko
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In-Situ Space Charge Measurement System for Space Environment Monitoring

High Performance Polymers, 2004
An in-situ, internal space charge measurement system for dielectric materials under irradiation has been developed by using the pulsed electroacoustic (PEA) method. This system can observe space charge profiles in dielectric materials under irradiation, and was applied to an irradiation chamber at the Office National d'Etudes et de Recherches ...
Kaori Fukunaga, Takashi Maeno, Virginie Griseri   +2 more
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Portable space charge measurement system for space environment monitoring

Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2003
The condition of materials affected by radiation is one of the concerns in space technology. Upon irradiation, polymeric materials store charges, resulting in deterioration or breakdown. We have developed a small pulsed electroacoustic (PEA) system that can be mounted in a vacuum chamber, in order to measure the internal space charge of materials ...
T. Maeno, K. Fukunaga
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Assessment of space charge based on PEA measurement

2015 1st Conference on Power, Dielectric and Energy Management at NERIST (ICPDEN), 2015
Accumulation of charge within a polymeric insulating material under DC field stresses is a matter of concern. Charge accumulated within the polymeric insulating material depends on the composition and structural properties of the material. In this work, spatial distribution of charge trapped within the volume of the dielectric material is measured ...
Supriyo Das, Nandini Gupta
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Measurements on nonlinear space-charge waves

IEEE Transactions on Electron Devices, 1967
Results of measurements on the nonlinear ac currents in a velocity modulated confined electron beam are reported. The test vehicle is a two cavity klystron type device with an axially movable demodulator. The ac beam currents at the fundamental and at the two lowest harmonic frequencies have been measured as functions of the distance along the beam for
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HVDC Corona Space Charge Modeling and Measurement

IEEE Transactions on Power Delivery, 2011
An electrometer circuit is designed and developed to measure the ion-space charge created during HVDC corona events. The interpretation of the electrometer output and visualization of various discharge processes are facilitated by a particle-in-cell computational code.
Otto A.J., Reader H.C.
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Space Charge Measurement and Electroluminescence of Aged LDPE

2007 IEEE International Conference on Solid Dielectrics, 2007
Polymeric insulation aging is related to the change of its different properties. An attempt is tried to relate the Fourier transform infrared (FTIR) absorption spectra, space charge distribution and electroluminescence (EL) behaviors of aged polymers. Low density polyethylene (LDPE) samples are aged in a thermal aging oven with different periods, and ...
Kai Yang, Guan-Jun Zhang, Ya-Jun Qiao, Zhang Yan   +3 more
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Measurement of the space charges produced in streamers

Journal of Physics D: Applied Physics, 1973
An investigation was made of the slow phase of cathode-directed streamers in gas discharges, which developed according to the streamer mechanism. A 3 cm gap was used with a uniform electric field and low overvoltages (about 20% above the DC breakdown voltage). All experiments were carried out in an N2-CH4mixture (total about 100 Torr).
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Space charge measurements in high voltage cables

[1992] Proceedings of the 4th International Conference on Conduction and Breakdown in Solid Dielectrics, 2003
It is demonstrated that the thermal step method makes it possible to study the electric state of high-voltage cable. The origin and nature of the space charge can be determined by systematic studies with varying important parameters. The authors present results for two different XLPE (cross-linked polyethylene) virgin cables: the insulating thicknesses
A. Sabir, A. Toureille
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Space Charge Distribution Measurement in Complex Insulating Structures

IEEJ Transactions on Electrical and Electronic Engineering, 2008
AbstractElectrical insulation involves more and more complex structures in which the electric field or the material can be heterogeneous. For testing space charge buildup in such structures, one‐dimensional measurements are still often used owing to their simplicity.
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