Title :
The electrical properties of filled epoxy resin systems - a comparison
Author :
Mackersie, J.W. ; Given, M.J. ; MacGregor, S.J. ; Fouracre, R.A.
Author_Institution :
Centre for Electr. Power Eng., Strathclyde Univ., Glasgow, UK
fDate :
6/23/1905 12:00:00 AM
Abstract :
The electrical properties of an epoxy resin system for use as machine insulation containing either ZnO or Al2O3 fillers have been investigated. The fillers impart non-linear current-voltage characteristics to the materials. The electrical conductivities of plaques of epoxy containing filler were a function of the applied electric field strength. The current-voltage relationship was dependent on the filler and differed from that for the unfilled material. The current transient as a result of an applied DC step voltage depended on the filler type and applied field strength. Multi-layer, plaque samples of mica-paper, glass-cloth and epoxy resin, with and without ZnO filler, were examined electrically. Current transient measurements allowed the estimation of the dielectric loss from ~10-5-10-1 Hz. Global thermally stimulated depolarisation current (TSDC) spectra were obtained. Partial polarisation spectra at 5°C intervals were also obtained from 35-150°C for unfilled and 20% ZnO filled samples. The spectra showed significant differences between sample types
Keywords :
alumina; composite insulating materials; dielectric losses; dielectric polarisation; epoxy insulation; filled polymers; high field effects; machine insulation; space charge; thermally stimulated currents; zinc compounds; 1E-5 to 1E-1 Hz; 35 to 150 C; Al2O3; ZnO; applied DC step voltage; applied electric field strength; current transient; dielectric loss; electrical conductivities; electrical properties; filled epoxy resin systems; filler dependent characteristics; glass-cloth; high field response; machine insulation; mica-paper; multilayer samples; nonlinear current-voltage characteristics; partial polarisation spectra; plaques; short-circuit depolarisation current; tape samples; thermally stimulated depolarisation current; Conducting materials; Conductivity; Current measurement; Current-voltage characteristics; Dielectric loss measurement; Dielectric materials; Dielectrics and electrical insulation; Epoxy resins; Voltage; Zinc oxide;
Conference_Titel :
Solid Dielectrics, 2001. ICSD '01. Proceedings of the 2001 IEEE 7th International Conference on
Conference_Location :
Eindhoven
Print_ISBN :
0-7803-6352-3
DOI :
10.1109/ICSD.2001.955538
