Krzysztof Walczak
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Frequency response of oil impregnated pressboard and paper samples for estimating moisture in transformer insulation
C Ekanayake, SM Gubanski, A Graczkowski, K Walczak
IEEE Transactions on Power Delivery 21 (3), 1309-1317, 2006
Field experiences with measurements of dielectric response in frequency domain for power transformer diagnostics
J Blennow, C Ekanayake, K Walczak, B Garcia, SM Gubanski
IEEE transactions on Power Delivery 21 (2), 681-688, 2006
Moisture in cellulose insulation of power transformers-statistics
J Gielniak, A Graczkowski, H Moranda, P Przybylek, K Walczak, ...
IEEE Transactions on Dielectrics and Electrical Insulation 20 (3), 982-987, 2013
Moisture migration in an oil-paper insulation system in relation to online partial discharge monitoring of power transformers
W Sikorski, K Walczak, P Przybylek
Energies 9 (12), 1082, 2016
On-Line partial discharge monitoring system for power transformers based on the simultaneous detection of high frequency, ultra-high frequency, and acoustic emission signals
W Sikorski, K Walczak, W Gil, C Szymczak
Energies 13 (12), 3271, 2020
Can the bubble effect occur in an oil impregnated paper bushing?
P Przybylek, H Moranda, K Walczak, H Moscicka-Grzesiak
IEEE Transactions on Dielectrics and Electrical Insulation 19 (6), 1879-1883, 2012
Dielectric responses of new and aged transformer pressboard in dry and wet states
J Gielniak, C Ekanayake, K Walczak, A Graczkowski, S Gubanski
Proceedings of 2005 International Symposium on Electrical Insulating …, 2005
Dielectric frequency response of cellulose samples with various degree of moisture content and aging
K Walczak, A Graczkowski, J Gielniak, H Morańda, H Mościcka-Grzesiak, ...
Przegląd Elektrotechniczny 1, 264-267, 2006
Power transformer diagnostics based on acoustic emission method
W Sikorski, K Walczak
Acoustic emission-research and applications 1, 1-13, 2013
Method for vacuum state evaluation based on analysis of dynamics changes of electron field emission current and X-radiation in time
K Walczak
20th International Symposium on Discharges and Electrical Insulation in …, 2002
Influence of thermal ageing on dielectric response of oil-paper insulation
J Gielniak, A Graczkowski, S Gubanski, H Moranda, H Moscicka-Grzesiak, ...
Materials Science-Poland 27 (4/2), 1199-1205, 2009
Comparative Tests of Partial Discharges in Nomex® 910 Paper and Cellulose Paper
H Moranda, H Moscicka-Grzesiak, P Przybylek, K Walczak, R Szewczyk
Energies 13 (3), 647, 2020
The bubble effect in bushings–investigations on models
P Przybylek, H Moranda, K Walczak, H Moscicka-Grzesiak
IEEE Transactions on Dielectrics and Electrical Insulation 22 (6), 3405-3412, 2015
Enlargement of fingerprint in procedure of defects recognition in oil-paper insulation using time parameters of PD
H Moranda
Proceedings of the XIV International Symposium on High Voltage Engineering …, 2005
Assessment of insulation state of power transformer after 35 years of operation using different diagnostic methods
K Walczak, A Graczkowski, J Gielniak, S Gubanski, H Moscicka-Grzesiak
International Symposium on High Voltage Engineering, 2005
Non-contact high voltage measurement in the online partial discharge monitoring system
K Walczak, W Sikorski
Energies 14 (18), 5777, 2021
Online condition monitoring and expert system for power transformers
K Walczak, W Sikorski, K Siodla, M Andrzejewski, W Gil
Proceedings of the 3rd Advanced Research Workshop on Transformers, Santiago …, 2010
Evaluation of internal pressure of vacuum interrupters based on dynamics changes of electron field emission current and X-radiation
K Walczak, J Janiszewski, H Moscicka-Grzesiak
1999 Eleventh International Symposium on High Voltage Engineering 5, 192-195, 1999
Temperature distribution in the insulation system of condenser-type HV bushing—Its effect on dielectric response in the frequency domain
K Walczak, J Gielniak
Energies 14 (13), 4016, 2021
Analysis of overvoltages appearing in one-sidedly ungrounded MV power cable screen
A Schött-Szymczak, K Walczak
Energies 13 (7), 1821, 2020
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