Enhanced online PD evaluation on power transformers using wavelet techniques and frequency rejection filter for noise suppression

Author

Werle, Peter ; Akbari, Asghar ; Borsi, Hossein ; Gockenbach, Ernst

Author_Institution

Inst. of Electr. Power Syst., Hannover Univ., Germany

fYear

2002

fDate

7-10 Apr 2002

Firstpage

195

Lastpage

198

Abstract

In this contribution different digital filtering algorithms, which use new approaches like the wavelet transform as well as a new introduced adaptive frequency rejection filter in the frequency domain, are investigated concerning their ability to suppress different kinds of noise as they appear during online partial discharge (PD) measurements on power transformers. Therefore various investigations on measured PD signals in the laboratory superimposed by synthetically generated noises have been performed leading to recommendations how different noise types can be efficiently suppressed.

Keywords

adaptive filters; digital filters; frequency-domain analysis; interference suppression; partial discharge measurement; power transformer insulation; power transformer testing; wavelet transforms; white noise; adaptive frequency rejection filter; digital filtering algorithms; frequency domain; frequency rejection filter; online PD evaluation; online partial discharge measurements; power transformers; sinusoidal noise suppression; synthetically generated noise; wavelet techniques; wavelet transform; white noise suppression; Filtering algorithms; Filters; Frequency; Noise generators; Noise measurement; Partial discharge measurement; Partial discharges; Power transformers; Wavelet domain; Wavelet transforms;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 2002. Conference Record of the 2002 IEEE International Symposium on

Print_ISBN

0-7803-7337-5

Type

conf

DOI

10.1109/ELINSL.2002.995911

Filename

995911