Title :
Dielectric responses of new and aged transformer pressboard in dry and wet states
Author :
Gielniak, J. ; Ekanayake, C. ; Walczak, K. ; Graczkowski, A. ; Gubanski, S.
Author_Institution :
Inst. of Electr. Power Eng., Poznan Tech. Univ., Poland
Abstract :
This paper presents results of dielectric response measurements in frequency domain. obtained at different temperatures for oil-impregnated pressboard samples (new and aged) containing different amount of moisture. Description of the sample preparation and the ageing procedure is also included. The dielectric responses were used for defining master curves and activation energies at the different humidity levels, to be later used in the modelling of diagnostic measurements on transformers. Spread of the results from samples containing similar amount of moisture are also presented.
Keywords :
dielectric measurement; frequency-domain analysis; impregnated insulation; insulation testing; moisture; power transformer insulation; power transformer testing; transformer oil; aged transformer pressboard; ageing procedure; diagnostic transformers measurement; dielectric response measurements; frequency domain; humidity levels; oil-impregnated pressboard samples; Aging; Containers; Dielectric measurements; Moisture measurement; Oil insulation; Power measurement; Power system reliability; Power transformer insulation; Power transformers; Temperature;
Conference_Titel :
Electrical Insulating Materials, 2005. (ISEIM 2005). Proceedings of 2005 International Symposium on
Print_ISBN :
4-88686-063-X
DOI :
10.1109/ISEIM.2005.193569
