Results 241 to 250 of about 7,607,101 (286)

Internal space charge measurement for space environment monitoring

Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417), 2004
Dielectric materials used in space environment have been investigated in an irradiation chamber which reproduce spatial environment. Under irradiation, polymeric materials are able to store charges inside as well as on the surface. A new pulsed electroacoustic space charge measurement unit has been recently developed.
K. Fukunaga, V. Griseri, T. Maeno, C. Laurent, D. Payan, L. Levy   +5 more
openaire   +1 more source

Lock-in Calibration for Space Charge Measurement

2020 IEEE 3rd International Conference on Dielectrics (ICD), 2020
Space charge will inevitably appear in practical applications, like cables that have been applied HVDC, in which space charge is concerned to be existed. As the space charge distribution has a strong link with the degradation of insulation material and it also is a core point for insulation technology upgrade.
Xiaoxin Li, Shafira Zahra, Tomohiro Kawashima, Yoshinobu Murakami, Naohiro Hozumi   +4 more
openaire   +1 more source

Review of space charge measurements in dielectrics

IEEE Transactions on Dielectrics and Electrical Insulation, 1997
In the last two decades, a significant effort has been directed to understand the internal charge distributions in dielectrics. This has resulted in the development of a number of methods which give detailed information about space charge distributions.
N.H. Ahmed, N.N. Srinivas
openaire   +1 more source

Space-charge measurement in composite dielectrics

2008 12th International Middle-East Power System Conference, 2008
To improve the manufacturing of multi- composites of solid insulation materials, this paper has studied the space charge distribution in pure, micro- and nano-filled composites of solid dielectric materials at various high impulse voltages. The pulsed electro-acoustic (PEA) method has been used as one of the most effective techniques for the ...
A. Thabet, John Fothergill
openaire   +1 more source

Space charge influence on resistivity measurements

Solid-State Electronics, 1977
Abstract The influence of space charge layers on semiconductor resistivity measurements has been studied. The results show that straightforward resistivity measurements are only correct in a limited resistivity range. With decreased impurity density and sample or layer thickness, corrections become more important. In a considerable number of cases no
P. Kramer, L.J. van Ruyven
openaire   +1 more source

Space charge measurements on filled epoxy

Proceedings of the 2004 IEEE International Conference on Solid Dielectrics, 2004. ICSD 2004., 2004
The effects fillers can have on the space charge measurement are discussed. A review of the influence of particle piezoelectricity, permittivity, electrostrictivity and expansivity, on the space charge signal is presented. A silica filled epoxy resin is analysed using the light-induced-pressure-pulse (LIPP) method.
S. Hole, A. Sylvestre, C. Guillermin, P. Rain, S. Rowe   +4 more
openaire   +1 more source

Measurement of space charge fields in polymers

Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1987, 1987
This paper reports progress in measuring electric fields due to space charge in continuous dielectric media by-means of the thermal pulse method[1–3]. This work is pertinent to the study of charge injection and transport processes as well as to the study of the effects of space charge on the dielectric breakdown of electric power cables using solid ...
Aime S. De Reggi, Martin G. Broadhurst, G. Thomas Davis, Frederick I. Mopsik   +3 more
openaire   +1 more source

Measurement of space charge accumulation in PPLP

Proceedings of 1999 IEEE 13th International Conference on Dielectric Liquids (ICDL'99) (Cat. No.99CH36213), 2003
The author tested space charge accumulation in the oil impregnated insulation paper for DC oil-filled cables, and found that polypropylene shows no resistivity reduction with time whereas kraft paper in polypropylene laminated paper (PPLP) does show some reduction.
openaire   +1 more source

Measurement of the photorefractive space-charge field in a ferroelectric mesogen

Applied Physics Letters, 2004
We report on the measurement of the photorefractive space-charge field in a chiral smectic C mesophase. The liquid crystal is intrinsically photoconducting and undoped. The space-charge field amplitude, obtained from a model connecting the induced refractive index modulation with the electric fields within the medium, is only 1% of the applied field ...
M. TALARICO, R. TERMINE, G. BARBERIO, D. PUCCI, M. GHEDINI, GOLEMME, Attilio   +5 more
openaire   +3 more sources

Behind space charge distribution measurements

2011 - 14th International Symposium on Electrets, 2011
Measuring space charge seems relatively simple, but the complexity of the sample structure and interfacial conditions may result in biased analysis. In this abstract, some clues are given to test which factor are important to check before analyzing measurements.
openaire   +1 more source