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Experimental and Numerical Analysis of Cellulosic Insulation Failures of Continuously Transposed Conductors under Short Circuits and Thermal Ageing in Power Transformers
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(English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135Article in journal (Refereed) Accepted
Abstract [en]

The integrity of the cellulosic insulation in power transformers is considered one of the most relevant parameters that affects their performance and reliability. Electric faults, such as short circuits, have thermal and mechanical effects that degrade the paper and can eventually produce the end-of-life of the transformer. The evolution of the properties of the paper insulation of a commercial continuously transposed conductor due to thermal ageing was characterised through the degree of polymerisation and tensile testing. Failure initiation and propagation in the paper was analysed macroscopically and microscopically using scanning electron microscope. A finite element numerical mechanical model of the conductor was implemented to reproduce the experiments and to obtain the load level and strain state that produce failure at each ageing state, aiming at developing a failure model for the insulation. This model may contribute to an improvement in manufacturing processes and management of the electrical system.

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Other Electrical Engineering, Electronic Engineering, Information Engineering Applied Mechanics
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URN: urn:nbn:se:uu:diva-396390OAI: oai:DiVA.org:uu-396390DiVA, id: diva2:1367647
Available from: 2019-11-04 Created: 2019-11-04 Last updated: 2019-11-05

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Afshar, Reza

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