Influence of accelerated thermal ageing on the performance of alternative solid dielectrics for power transformers
In the present paper, the influence of accelerated thermal ageing on the performance of alternative solid dielectrics for power transformers, namely thermally upgraded Kraft (TUK), Nomex 910 and Nomex 410 in conjunction with mineral oil, has been investigated. To analyse the properties of these solid dielectrics with mineral transformer oil, accelerated thermal ageing has been carried out at various temperatures ranging from 100°C to 220°C. Furthermore, in order to compare the operating performance of transformer insulation, several electrical, thermal, physical and chemical properties of transformer oil, including breakdown voltage, interfacial tension (IFT), water content, absorption coefficient and colour factor, have been determined. Subsequently, the breakdown voltage and tensile strength of different solid dielectrics have been determined. It has been revealed from the test results that Nomex-impregnated oil samples have shown better thermal performance and oxidation stability than thermally upgraded Kraft-based oil samples. Also, these samples consist of fewer dissolved decay contents and sludge. Therefore, Nomex materials are suggested as alternative solid dielectrics for power transformers. These solid dielectrics provide a long service run and reduced operating and maintenance costs of transformers. It is envisioned that the present experimental study will be very beneficial for utility managers of transformers.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Research Article
Publication date: January 1, 2019
More about this publication?
- Official Journal of The British Institute of Non-Destructive Testing - includes original research and devlopment papers, technical and scientific reviews and case studies in the fields of NDT and CM.
- Information for Authors
- Submit a Paper
- Subscribe to this Title
- Information for Advertisers
- Terms & Conditions
- Ingenta Connect is not responsible for the content or availability of external websites