Impact of the Use of Vegetable Oil on the Mechanical Failure of the Cellulosic Insulation of Continuously Transposed Conductors in Power Transformers

Natural esters have become of interest for the industry in recent years as dielectric liquids for power transformers, and many studies are focused on their dielectric and chemical properties and on their influence in the degradation of the solid insulation due to aging. However, very little is known...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2022-04, Vol.29 (2), p.607-613
Main Authors: Oria, C., Mendez, C., Carrascal, I., Ortiz, A., Ferreno, D.
Format: Article
Language:English
Subjects:
Accelerated aging
Aging
Aging (natural)
Cellulose esters
Chemical properties
Conductors
Crepe
Degree of polymerization
Dielectrics
Esters
Failure analysis
Initiation (polymerization)
Insulation
ISO Standards
materials testing
mechanical behavior
Mechanical factors
Mechanical properties
Mineral oils
Oil insulation
Power transformer insulation
power transformers
short circuits
Tensile tests
Transformers
Vegetable oils
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Summary:Natural esters have become of interest for the industry in recent years as dielectric liquids for power transformers, and many studies are focused on their dielectric and chemical properties and on their influence in the degradation of the solid insulation due to aging. However, very little is known about their impact on the evolution of the mechanical properties of the paper insulation, which are acknowledged to have a considerable influence in their overall performance and reliability during the operating life of power transformers. This work studies the effects of thermal aging with vegetable oil in some commercial components, which are commonly used in power transformers, such as an insulated continuously transposed conductor (CTC) and samples of thermally upgraded crepe insulation. The changes in the properties of the crepe paper insulation are characterized through the degree of polymerization and tensile testing. Failure initiation and propagation in the insulation of the CTC is analyzed macroscopically. The results are compared with those obtained when using mineral oil, showing that the use of vegetable oil has a protective effect over mechanical properties of the studied types of paper insulation.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2022.3157936