Spectrum of polarization phenomena of long time-constant as a diagnostic method of oil-paper insulating systems

Author

Bognár, A. ; Csépes, G. ; Kalocsai, L. ; Kispál, I.

Author_Institution

Furukawa Electr. Inst. of Technol., Budapest, Hungary

fYear

1991

fDate

8-12 Jul 1991

Firstpage

723

Abstract

A novel test method for the assessment of the bulk dielectric properties of oil-paper insulation has been developed. Specifically, the authors describe a simple on-site DC testing and apparatus for the determination of the polarization spectrum in the polarization time-constant domain of 10^-3 to 10⁴ s. In this range the so-called interface polarization phenomena of long time constant are active, which are highly influenced by the water content of oil-impregnated paper insulation and the adsorption of byproducts of aging. The method can be regarded as a complementary diagnosis method of dissolved gas analysis and other analytical methods and gives information on the general state and dielectric aging of the impregnated paper insulation. The test method and apparatus have been successfully and widely used on high-voltage power transformers of the Hungarian Electricity Board

Keywords

composite insulating materials; dielectric polarisation; insulating oils; insulation testing; maintenance engineering; paper; transformer insulation; transformer testing; 1E-3 to 1E-4 s; Hungarian Electricity Board; adsorption of byproducts; apparatus; bulk dielectric properties; complementary diagnosis method; diagnostic method; dielectric aging; dissolved gas analysis; high-voltage power transformers; interface polarization phenomena; long time-constant; oil-impregnated paper insulation; oil-paper insulating systems; on-site DC testing; polarisation spectrometry; polarization spectrum; test method; water content; Aging; Dielectrics and electrical insulation; Dissolved gas analysis; Gas insulation; Information analysis; Insulation testing; Oil insulation; Polarization; Power transformer insulation; Power transformers;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICPADM.1991.172167

Filename

172167