Title :
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
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;
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
DOI :
10.1109/ICPADM.1994.414116
