NDLI: Studies of space charge in electrically aged low density polyethylene

Content Provider	IEEE Xplore Digital Library
Author	Lanca, M.C. Neagu, E.R. Marat-Mendes, J.N.
Copyright Year	2002
Description	Author affiliation: Departamento de Ciencias dos Materiais, Univ. Nova de Lisboa, Caparica, Portugal (Lanca, M.C.; Neagu, E.R.; Marat-Mendes, J.N.)
Abstract	Space charge in electrically aged LDPE was studied using a recently developed technique combining isothermal charging and discharging with non-isothermal measurements. Samples were aged in a NaCl aqueous solution at 40/spl deg/C for 1500 h under an AC field of 6 MV/m (50 Hz). The samples were then isothermally DC charged and discharged (both currents recorded). Next a non-isothermal experiment with constant heating rate was performed. Finally, the sample was kept at the highest temperature and the final isothermal discharge current registered. The last step has to be carried on for a long time to ensure an almost complete discharge of the remnant charge so that results become reproducible and possible to analyze. Selective charging (careful choice of the field, temperature and the ratio of charging/discharging times) revealed the presence of different trapping sites. From the analysis of the isothermal and non-isothermal data the relaxation times and activation energies could be obtained.
Sponsorship	IEEE Dielectrics & Electrical Insulation Soc. IEEE Ultrasonics & Frequency Control Soc
Starting Page	19
Ending Page	22
File Size	380034
Page Count	4
File Format	PDF
ISBN	0780375602
DOI	10.1109/ISE.2002.1042935
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-03
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Space charge Aging Polyethylene Temperature Isothermal processes Current measurement Charge measurement Density measurement Electric variables measurement Reproducibility of results
Content Type	Text
Resource Type	Article

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