Experience with diagnostic tools for condition assessment of large power transformers

Author

Fuhr, Jitka ; Aschwanden, Thomas

Author_Institution

ABB BA Power Transformers, Spiez, Switzerland

fYear

2004

fDate

19-22 Sept. 2004

Firstpage

508

Lastpage

511

Abstract

The application of advanced off-line methods and procedures for condition assessment of new and service-aged power transformers are discussed. The selection of the diagnostic methods is based on the main operational stresses (electrical, mechanical, thermal) and on typical failure modes: (1) detection of polar components in the paper/oil insulating system using frequency domain spectroscopy (FDS) or using measurements of polarisation/depolarisation currents (PDC) in the time domain, (2) localization of inhomogeneities in the insulating system using sensitive partial discharge detection (PD) and (3) detection of deformations and movement of windings in the active part using measurement of the transfer function (FRA).

Keywords

ageing; condition monitoring; deformation; electric current measurement; failure analysis; partial discharge measurement; polarisation; power transformer insulation; stress effects; time-frequency analysis; transfer functions; transformer oil; transformer windings; FDS; condition assessment; deformation detection; diagnostic tools; failure modes; frequency domain spectroscopy; large power transformers; off-line methods; operational stresses; paper-oil insulating system; partial discharge detection; polar component detection; polarisation-depolarisation current measurements; service-aged power transformers; time domain analysis; transfer functions; transformer windings; Current measurement; Dielectrics and electrical insulation; Electric variables measurement; Frequency measurement; Mechanical variables measurement; Oil insulation; Partial discharge measurement; Power transformers; Stress measurement; Thermal stresses;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 2004. Conference Record of the 2004 IEEE International Symposium on

ISSN

1089-084X

Print_ISBN

0-7803-8447-4

Type

conf

DOI

10.1109/ELINSL.2004.1380668

Filename

1380668