Long-term performance of nanocomposite in power transmission and distribution systems

Liang, M 2018, Long-term performance of nanocomposite in power transmission and distribution systems, Doctor of Philosophy (PhD), Engineering, RMIT University.

Document type: Thesis
Collection: Theses

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Title Long-term performance of nanocomposite in power transmission and distribution systems
Author(s) Liang, M
Year 2018
Abstract The use of nanofillers to enhance the properties of conventional composite has been studied since the 1990s. It has been proved that nanocomposite has superior mechanical, electrical and thermal properties compared with conventional composite. When polymer devices were first used in power transmission systems to replace porcelain devices, many of them did not reach the expected service life, and early failures created many challenges for the power companies. Just like most polymeric materials, the long-term performance of nanocomposite faces the same problem, an issue which demands further investigation. In this thesis, the effect of accelerated weathering on different kinds of nanocomposite, as well as micro-composite and micro-nano-composite, is studied. The specimens are prepared using various types of synthesising methods including sonication and a relatively new technique called the ‘planetary centrifugal mixing technique’. The latter technique is an effective synthesizing method that could be applied in industry to produce bulk nanocomposite with a good dispersion of nano-fillers within a host matrix. Detailed analysis and comparison between these mixing techniques to achieve a uniform dispersion of the fillers are presented. In order to simulate the long-term aging process in these specimens, a multi-stress accelerated aging method based on ASTM G154 standard is applied to age the nano, micro, and micro-nano-composite specimens. The experimental results show improvements in electrical, thermal and mechanical properties such as improved dielectric breakdown strength, glass transition temperature and thermal stability in nanocomposite and nano-micro-composite both before and after aging. All the nanocomposite specimens exhibit a significantly higher glass transition temperature than pure epoxy resin specimens; the results also showed that the accelerated aging process tends to further increase the glass transition temperature, which can be explained by the curing behaviour of epoxy resin. However, both nanocomposite and nano-micro-composite tended to lose the superior surface partial discharge resistance after the accelerated aging. The outcomes of this thesis proved that the most of the unique bulk properties of nanocomposite and nano-micro-composite can remain after a lengthy aging process, but the superior surface properties tend to degrade with time. This research also provides an effective approach for synthesising nanocomposite materials.
Degree Doctor of Philosophy (PhD)
Institution RMIT University
School, Department or Centre Engineering
Subjects Power and Energy Systems Engineering (excl. Renewable Power)
Polymers and Plastics
Keyword(s) Nanocomposite
Nanocomposite synthesis method
Material characterisation
Accelerated aging
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Created: Wed, 08 Aug 2018, 14:34:20 EST by Adam Rivett
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