Dielectric relaxation behaviour of electrically (AC) aged polyethylene in humid environment

Author

Scarpa, P.C.N. ; Svatik, A. ; Das-Gupta, D.K.

Author_Institution

Sch. of Electron. Eng. & Comput. Syst., Univ. of Wales, Bangor, UK

Volume

2

fYear

1994

fDate

3-8 Jul 1994

Firstpage

736

Abstract

The dielectric spectroscopy of the unaged and AC aged (6 kV/mm, 2.5 kHz, 0.1N NaCl, 69 hours) LDPE samples with three different experimental conditions (i.e., at room temperature, at room temperature after additional DC poling at 70°C with 2 kV/mm for 1 hour followed by cooling down to room temperature in the presence of the field, and at 70°C), are presented. It is shown that a parallel combination of the “universal relaxation law” and “low frequency dispersion” relaxation can account for the observed behaviour. The observed changes in the low frequency range (10^-5Hz to 10^-2Hz) appear to be most significant regarding the electrical ageing

Keywords

ageing; dielectric losses; dielectric relaxation; environmental testing; insulation testing; polyethylene insulation; 10 muHz to 0.1 MHz; 69 hour; 70 C; AC aging; DC poling; LDPE; dielectric relaxation; dielectric spectroscopy; electrical aging; humid environment; low frequency dispersion; low frequency range; polyethylene; room temperature; universal relaxation law; Aging; Cooling; Dielectric measurements; Electrochemical impedance spectroscopy; Electrodes; Frequency; Polyethylene; Polymers; Temperature; Trees - insulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 1994., Proceedings of the 4th International Conference on

Conference_Location

Brisbane, Qld.

Print_ISBN

0-7803-1307-0

Type

conf

DOI

10.1109/ICPADM.1994.414116

Filename

414116