Title :
Ageing of mineral oils-a diagnostic study
Author :
Krishnamoorthy, P.R. ; Krishnaswamy, K.R. ; Vijayakumari, S. ; Kumar, K.
Author_Institution :
Mater. Technol. Div., Central Power Res. Inst., Bangalore, India
Abstract :
Simulated laboratory experiments on the effects of copper/oil ratio and temperature considering the aspects of oxygen availability are presented. It is shown that copper/oil ratio is the most significant factor in accelerating the thermo-oxidation aging process. Laboratory experiments for representing aging corresponding to that in the field are reported. The data so produced are extrapolated for life prediction in service. It is shown that it is possible to estimate the life of an oil with the help of Myer´s index. It is important to determine experimentally a range of gas levels for the oil to be used during factory tests. Gas values exceeding this range are considered to be indicative of incipient faults for new transformers after factory tests
Keywords :
ageing; insulating oils; insulation testing; life testing; oxidation; transformer insulation; Myer index; copper/oil ratio; diagnostic study; factory tests; gas levels; incipient faults; life prediction; mineral oils; oxygen availability; thermo-oxidation aging; transformers; Accelerated aging; Copper; Laboratories; Life estimation; Minerals; Petroleum; Production facilities; Temperature; Testing; Transformers;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-87942-568-7
DOI :
10.1109/ICPADM.1991.172354
