K
Krzysztof Walczak
Researcher at Poznań University of Technology
Publications - 48
Citations - 688
Krzysztof Walczak is an academic researcher from Poznań University of Technology. The author has contributed to research in topics: Pressboard & Partial discharge. The author has an hindex of 9, co-authored 45 publications receiving 606 citations.
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Journal ArticleDOI
Frequency response of oil impregnated pressboard and paper samples for estimating moisture in transformer insulation
TL;DR: In this article, the authors provide an open access to the frequency domain spectra of oil impregnated paper and pressboard samples, which can then be used in modeling of the results of diagnostic measurements in power transformers.
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Field experiences with measurements of dielectric response in frequency domain for power transformer diagnostics
TL;DR: A systematic investigation on the influence of some factors on the results of dielectric response measurements in field conditions, concentrated on frequency response measurements, although some results from the use of polarization and depolarization current technique are also discussed.
Field Experiences with Measurements of Dielectric Response in Frequency Domain for Power Transformer Diagnostics
TL;DR: In this paper, a systematic investigation on the influence of some factors on the results of dielectric response measurements in field conditions is presented, with different equipment connected in parallel, and some results from the use of polarization and depolarization current technique are also discussed.
Journal ArticleDOI
Moisture in cellulose insulation of power transformers - statistics
Jarosław Gielniak,A. Graczkowski,Hubert Morańda,Piotr Przybyłek,Krzysztof Walczak,Zbigniew Nadolny,H. Moscicka-Grzesiak,K. Feser,Stanislaw Gubanski +8 more
TL;DR: In this article, the results of extensive investigations aimed at determining the moisture content in a large population of power transformers (161 units) were presented by means of the Frequency Response Spectroscopy (FDS) method.
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Moisture Migration in an Oil-Paper Insulation System in Relation to Online Partial Discharge Monitoring of Power Transformers
TL;DR: In this article, the authors investigated the effect of temperature, humidity, and time on the ignition of partial discharges (PDs) in a power transformer, and concluded that these conditions have a significant impact on PD ignition and intensity.