A Novel Methanol-Based DP Estimation Method With a New Methanol Peak Detector Index for Aging Assessment of Power Transformer Insulation Paper

Methanol concentration as an aging indicator can assess cellulose aging and estimate cellulose degree of polymerization (DP). Despite the advantages of methanol (MeOH), its major disadvantage is that its concentration in the oil decreases after some time. This point is called the MeOH peak in this a...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2022-08, Vol.29 (4), p.1506-1513
Main Authors: Teymouri, Ashkan, Vahidi, Behrooz, van der Wielen, Peter
Format: Article
Language:English
Subjects:
2-furfural (2-FAL)
Aging
aging indicator
Cellulose
Degree of polymerization
degree of polymerization (DP) estimation
Empirical equations
Furfural
Mathematical models
Methanol
methanol peak detector index (MPDI)
Oil insulation
Oils
Power transformer insulation
Production
Transformers
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Summary:Methanol concentration as an aging indicator can assess cellulose aging and estimate cellulose degree of polymerization (DP). Despite the advantages of methanol (MeOH), its major disadvantage is that its concentration in the oil decreases after some time. This point is called the MeOH peak in this article. Therefore, using this indicator when MeOH concentration is reduced leads to incorrect results. When using methanol, the main problem is that whenever the methanol concentration in a transformer is measured, it cannot be identified that the measured concentration belongs to the left or right side of the MeOH peak. If the measured concentration belongs to the right side of the MeOH peak, the estimated DP is incorrect. In this article, an empirical equation is established to estimate the DP value as a function of methanol concentration when methanol concentration belongs to the left side of the MeOH peak. Then, a new index called methanol peak detector index (MPDI) composed of a 2-furfural/MeOH ratio and normalized DP is presented to ensure the validity of the calculated DP value. If it is found that the measured concentration belongs to the left side of the MeOH peak, then the estimated DP by the presented equation is valid. Finally, the application of this method is verified by applying it to measurement data samples indicating the validity of the method.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2022.3188048