Effects of Metal Passivator Degradation on the Dissolved Gases Characteristics of Oil in Oil-immersed Transformers

Sulfur corrosion has been proven to significantly decrease the insulation performance of oil-immersed transformer and the addition of benzotriazole passivator (BTA) to insulating oil has been widely used to control the sulfur corrosion. However, the relevant studies indicate that the addition of met...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2021-10, Vol.28 (5), p.1735-1742
Main Authors: Gao, Si-Hang, Zeng, Xi-Song, Zhang, Guo-Wen
Format: Article
Language:English
Subjects:
Accelerated aging
Benzotriazole
benzotriazole passivator
Corrosion
Degradation
Dissolved gases
dissolved gases in oil
Gases
Insulation
Metals
Oil insulation
oil-paper insulation
Oils
stray gas
Sulfur
Thermal resistance
Transformers
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Summary:Sulfur corrosion has been proven to significantly decrease the insulation performance of oil-immersed transformer and the addition of benzotriazole passivator (BTA) to insulating oil has been widely used to control the sulfur corrosion. However, the relevant studies indicate that the addition of metal passivator to oil can cause abnormal generation of dissolved gases in oil. Thus, this study further explores the effects of metal passivator degradation on the dissolved gas characteristics of oil in oil-immersed transformers. Several accelerated aging experiments on oil-paper insulations with and without BTA are conducted. The results indicate that the addition of BTA lead to the generation of abnormal dissolved gases in the oil along with an increase of stray gases, especially the increase of H 2 , CO and CO 2 . Moreover, an abnormal production of the total hydrocarbon fraction is found, which may interfere with the DGA results. Finally, the degradation of BTA related to abnormal production of stray gases in the insulating oil was preliminarily analyzed and discussed.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2021.009524