7 November 2022
New study confirms belief about thermal class of Weidmann Transformerboard
In a recent study, Weidmann investigated the thermal aging performance of Transformerboard, as well as the sealed tube aging test procedure itself. In the 2011 edition of the IEEE C57.100 standard, a new sealed tube accelerated aging test procedure was introduced to determine the thermal class of solid and liquid insulation systems. The experimental work presented in the article investigated the effects of different test parameters on aging test results and data interpretation. The new findings on the dependence of the aging process on the ratio and type of materials in the system, as well as on the selected aging criteria, provide a better understanding of accelerated aging testing and the interpretation of aging data, along with practical recommendations for improvements to the test procedure.
In parallel, for the first time, the thermal index (and corresponding thermal class) of Weidmann Transformerboard, as a component of the so-called industry-proven insulation system together with thermally upgraded kraft paper and mineral oil, was investigated and defined based on the standard industry test. The results confirmed that Transformerboard has a higher thermal class, which challenges the decades-old assumption relating to the thermal class of Transformerboard as used in both power and distribution transformers.
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