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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
3302006
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
1682006
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
662013
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
492016
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
332020
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
262012
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
252005
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
202006
Power transformer diagnostics based on acoustic emission method
W Sikorski, K Walczak
Acoustic emission-research and applications 1, 1-13, 2013
182013
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
152002
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
142009
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
122020
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
112015
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
102005
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
102005
Non-contact high voltage measurement in the online partial discharge monitoring system
K Walczak, W Sikorski
Energies 14 (18), 5777, 2021
92021
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
92010
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
91999
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
82021
Analysis of overvoltages appearing in one-sidedly ungrounded MV power cable screen
A Schött-Szymczak, K Walczak
Energies 13 (7), 1821, 2020
82020
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