Fundamental concepts of using water activity probes to assess transformer insulation water content

Martin, Daniel, Saha, Tapan, Perkasa, Caesar, Lelekakis, Nick and Gradnik, Tim (2016) Fundamental concepts of using water activity probes to assess transformer insulation water content. IEEE Electrical Insulation Magazine, 32 3: 9-16. doi:10.1109/MEI.2016.7527120


Author Martin, Daniel
Saha, Tapan
Perkasa, Caesar
Lelekakis, Nick
Gradnik, Tim
Title Fundamental concepts of using water activity probes to assess transformer insulation water content
Journal name IEEE Electrical Insulation Magazine   Check publisher's open access policy
ISSN 0883-7554
1558-4402
Publication date 2016-08-01
Sub-type Article (original research)
DOI 10.1109/MEI.2016.7527120
Open Access Status Not yet assessed
Volume 32
Issue 3
Start page 9
End page 16
Total pages 8
Place of publication Piscataway, NJ, United States
Publisher Institute of Electrical and Electronics Engineers
Collection year 2017
Language eng
Abstract Abstract: The water concentration in transformer paper insulation must be monitored because, if it becomes too high, the paper insulation will age rapidly [1]-[4] and the transformer may fail on overload [5]-[9]. A failure can occur on overload if the temperature of the paper rises sufficiently to cause evolution of water bubbles. If these bubbles cause dielectric failure of the oil gap, the transformer may fail catastrophically. Paper insulation becomes brittle as it ages, and eventually becomes too brittle to act as an effective insulator. Oxygen increases the aging rate because the acids created by chemical reactions occurring in the oil, paper, and oxygen react further with water [10]-[12]. A study of the thermal aging of Kraft paper found that wet oxygenated paper degrades 40 times faster than the same paper heated in a dry oxygen-free environment [4]. The paper within a transformer is likely to degrade fastest at the top of the winding, where it is hottest [13]. Since the water concentration in the paper significantly influences its aging, it is important that the water concentration be measured accurately at the top of the winding.
Keyword Transformer
Insulation
Paper insulation
Condition monitoring
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Information Technology and Electrical Engineering Publications
 
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