Title :
Influence of ageing on the dielectric properties of carbonized transformer oil
Author :
Krins, M. ; Borsi, H. ; Gockenbach, E.
Author_Institution :
Schering Inst. of High Voltage Tech. & Eng., Hannover Univ., Germany
Abstract :
The paper reports experimental investigations dealing with the influence of ageing processes on the dielectric dissipation factor, the volume resistivity and the partial discharge inception voltage of carbonized mineral-based transformer oil. The oil was carbonized by stressing it with a defined number of lightning impulses of a known energy and was then subjected, for a period of 1000 hours, to accelerated ageing with metallic catalysts at 20 and 90°C in the presence of oxygen. The analysis of the dielectric properties reveals that ageing of carbonized oil samples leads to a faster and more intensive degradation of the fluid compared to uncarbonized oil
Keywords :
ageing; electric breakdown; impulse testing; insulation testing; life testing; partial discharges; power transformer insulation; power transformer testing; transformer oil; 1000 h; 20 C; 90 C; accelerated ageing; ageing effects; carbonized transformer oil; dielectric dissipation factor; dielectric properties; insulation breakdown testing; lightning impulses; metallic catalysts; oil degradation; partial discharge inception voltage; volume resistivity; Accelerated aging; Dielectrics; Lightning; Minerals; Oil insulation; Petroleum; Power transformer insulation; Switches; Temperature; Testing;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549403
