Title :
On the nature of growth of water trees and electrical aging of cross-linked polyethylene
Author :
Das-Gupta, D.K. ; Svatik, A. ; Bulinski, A. ; Densley, J. ; Bamji, S. ; Carlsson, D.
Author_Institution :
Sch. of Electron. Eng. Sci., Wales Univ., Bangor, UK
Abstract :
The nature of AC field aging of cross-linked polyethylene (XLPE) using NaCl and CuSO4 (0.1 M) electrodes was studied with Fourier transform infrared absorption (FTIR), thermally stimulated discharge current (TSDC), and thermal transient current (TTC) measurements. FTIR measurements show that oxidation of stabilized XLPE is significantly lower than that of the unstabilized materials. No noticeable increase in bound water content in the polymer was observed as measured by IR absorbance at 3370 cm-1. Progressive enhancements of absorbance at ~1715 cm-1 and the TSDC peak at 70°C with increasing field aging time appear to have the same origin. Thermal transient current magnitude is related to that of the integrated charge released in a TSDC thermogram
Keywords :
Fourier transform spectroscopy; ageing; electric breakdown of solids; oxidation; polymers; thermally stimulated currents; 70 degC; AC field aging; CuSO4; Fourier transform infrared absorption; IR absorbance; NaCl; TSDC; XLPE; bound water content; cross-linked polyethylene; electrical aging; integrated charge; oxidation; thermal transient current; thermal transient current magnitude; thermally stimulated discharge current; water trees; Aging; Electric variables measurement; Electrodes; Pollution measurement; Polyethylene; Polymers; Surface treatment; Temperature; Thermal variables measurement; Trees - insulation;
Conference_Titel :
Electrical Insulation, 1990., Conference Record of the 1990 IEEE International Symposium on
Conference_Location :
Toronto, Ont.
DOI :
10.1109/ELINSL.1990.109730
