LAPSE

LAPSE:2019.0390
Published Article
LAPSE:2019.0390
Moisture Migration in an Oil-Paper Insulation System in Relation to Online Partial Discharge Monitoring of Power Transformers
Wojciech Sikorski, Krzysztof Walczak, Piotr Przybylek
February 27, 2019
Most power transformers operating in a power system possess oil-paper insulation. A serious defect of this type of insulation, which is associated with long operation time, is an increase in the moisture content. Moisture introduces a number of threats to proper operation of the transformer, e.g., ignition of partial discharges (PDs). Due to the varying temperature of the insulation system during the unit’s normal operation, a dynamic change (migration of water) takes place, precipitating the oil-paper system from a state of hydrodynamic equilibrium. This causes the PDs to be variable in time, and they may intensify or extinguish. Studies on model objects have been conducted to determine the conditions (temperature, humidity, time) that will have an impact on the ignition and intensity of the observed phenomenon of PDs. The conclusions of this study will have a practical application in the evaluation of measurements conducted in the field, especially in relation to the registration of an online PD monitoring system.
Keywords
oil-paper insulation, online monitoring, partial discharge (PD), power transformer, water migration
Suggested Citation
Sikorski W, Walczak K, Przybylek P. Moisture Migration in an Oil-Paper Insulation System in Relation to Online Partial Discharge Monitoring of Power Transformers. (2019). LAPSE:2019.0390
Author Affiliations
Sikorski W: Institute of Electrical Power Engineering, Poznan University of Technology, Piotrowo 3A, 60-965 Poznan, Poland [ORCID]
Walczak K: Institute of Electrical Power Engineering, Poznan University of Technology, Piotrowo 3A, 60-965 Poznan, Poland
Przybylek P: Institute of Electrical Power Engineering, Poznan University of Technology, Piotrowo 3A, 60-965 Poznan, Poland
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Journal Name
Energies
Volume
9
Issue
12
Article Number
E1082
Year
2016
Publication Date
2016-12-17
Published Version
ISSN
1996-1073
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Original Submission
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PII: en9121082, Publication Type: Journal Article
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LAPSE:2019.0390
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doi:10.3390/en9121082
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Feb 27, 2019
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CC BY 4.0
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Feb 27, 2019
 
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Feb 27, 2019
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Calvin Tsay
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