Abstract
Materials used in high voltage applications have to meet a lot of regulations for their safety and functional usage during their lifetime. For high voltage applications the electrical properties are the most relevant designing criteria. However, the mechanical properties of such materials have rarely been considered for application dimensioning over the last decades. This article gives an overview of composite materials used in high voltage applications and some basic mechanical and thermo-mechanical characterization methods of such materials, including a discussion of influences on practically used epoxy based thermosets.
Highlights
For all electrical and electronic applications, the material’s ability to insulate and protect the conductive circuit is of high importance for the safety and functional operation
In the construction process of electrical applications, mechanical stresses are not considered to have severe influences on the lifetime of a product, though it is known in polymer engineering that the slightest stress or defect in polymer materials could lead to a failure of the product
Mechanical, fracture mechanical, and long-term characterization should be considered for the dimensioning of polymeric materials in electrical and electronic applications
Summary
For all electrical and electronic applications, the material’s ability to insulate and protect the conductive circuit is of high importance for the safety and functional operation. Since their introduction in the early 1970s, insulators built of polymer materials have been heavily used as suitable replacements for porcelain and glass insulators. For electrical insulating moldings, such as switch housings, connector shells, high voltage insulators, and equipment casings, thermosets are often chosen for their dimensional stability and mechanical performance when subjected to electrical, thermal and environmental stress over time [2].
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