Influence of Moisture Dependency of Pressboard on Transformer Winding Clamping Pressure

Article

Naranpanawe, Lakshitha, Ekanayake, Chandima, Saha, Tapan Kumar and Annamalai, Naranpanawe1, Chandima Ekanayake2, Tapan Kumar Saha1 and Pratheep K.. 2017. "Influence of Moisture Dependency of Pressboard on Transformer Winding Clamping Pressure." IEEE Transactions on Dielectrics and Electrical Insulation. 24 (5), pp. 3191-3200. https://doi.org/10.1109/Tdei.2017.006206
Article Title

Influence of Moisture Dependency of Pressboard on Transformer Winding Clamping Pressure

ERA Journal ID4449
Article CategoryArticle
AuthorsNaranpanawe, Lakshitha, Ekanayake, Chandima, Saha, Tapan Kumar and Annamalai, Naranpanawe1, Chandima Ekanayake2, Tapan Kumar Saha1 and Pratheep K.
Journal TitleIEEE Transactions on Dielectrics and Electrical Insulation
Journal Citation24 (5), pp. 3191-3200
Number of Pages10
Year2017
PublisherIEEE (Institute of Electrical and Electronics Engineers)
Place of PublicationUnited States
ISSN1070-9878
1558-4135
Digital Object Identifier (DOI)https://doi.org/10.1109/Tdei.2017.006206
Web Address (URL)https://ieeexplore.ieee.org/document/8120379
AbstractShort circuit (SC) strength of a power transformer is influenced by its winding clamping pressure. The required level of clamping pressure is selected at the design stage based on the maximum allowable SC current level of the transformer. Progressive loss of clamping pressure is a common problem in power transformers. Shrinkage and fading of the stiffness of solid insulation due to thermal degradation are the most common causes of this problem. It has also been identified that changes in the moisture content and repetitive compression cycles on pressboard during high current faults tend to change the winding clamping pressure. This study aims to investigate the effects of moisture and compression cycles on winding clamping pressure through a set of laboratory experiments and finite element analyses. Thickness change and compressive stress-strain curves of pressboard were measured under different moisture conditions. The results were then used to calculate changes in winding geometry and clamping pressure of a 100 kVA three phase, disc type transformer winding.
Keywordspower transformer; winding clamping pressure; cellulose; stressstrai; hysteresis; hygroscopic swelling
ANZSRC Field of Research 2020400805. Electrical energy transmission, networks and systems
401610. Timber, pulp and paper
340305. Physical properties of materials
Public NotesFiles associated with this item cannot be displayed due to copyright restrictions.
Byline AffiliationsUniversity of Queensland
Griffith University
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Alariqi, Sameh A.S., Kumar, A. Pratheep, Rao, B.S.M. Rao and Singh, R.P.. 2007. "Stabilization of γ-sterilized biomedical polyolefins by synergistic mixtures of oligomeric stabilizers. Part II. Polypropylene matrix ." Polymer Degradation and Stability. 92 (2), pp. 299-309. https://doi.org/10.1016/j.polymdegradstab.2006.10.010
Biodegradation of γ-sterilised biomedical polyolefins under composting and fungal culture environments
Alariqi, Sameh A.S., Kumar, A. Pratheep, Rao, B.S.M. and Singh, R.P.. 2006. "Biodegradation of γ-sterilised biomedical polyolefins under composting and fungal culture environments." Polymer Degradation and Stability. 91 (5), pp. 1105-1116. https://doi.org/10.1016/j.polymdegradstab.2005.07.004
An overview on the degradability of polymer nanocomposites
Pandey, Jitendra K., Reddy, K. Raghunatha, Kumar, A. Pratheep and Singh, R.P.. 2005. "An overview on the degradability of polymer nanocomposites." Polymer Degradation and Stability. 88 (2), pp. 234-250. https://doi.org/10.1016/j.polymdegradstab.2004.09.013
Recent Advances in Biodegradable Nanocomposites
Pandey, Jitendra K., Kumar, A. Pratheep, Misra, Manjusri, Mohanty, Amar K., Drzal, Lawrence T. and Singh, Raj. 2005. "Recent Advances in Biodegradable Nanocomposites ." Journal of Nanoscience and Nanotechnology. 5 (4), pp. 497-526. https://doi.org/10.1166/jnn.2005.111
Degradability of composites, prepared from ethylene–propylene copolymer and jute fiber under accelerated aging and biotic environments
Annamalai, Annamalai Pratheep, Singh, Raj Pal and Sarwade, Bhimrao D.. 2005. "Degradability of composites, prepared from ethylene–propylene copolymer and jute fiber under accelerated aging and biotic environments." Materials Chemistry and Physics. 92 (2-3), pp. 458-469. https://doi.org/10.1016/j.matchemphys.2005.01.027
Synthesis, characterization, and performance evaluation of novel stabilized TDI-based polyurethane coatings under accelerated weathering
Kumar, A. Pratheep, Reddy, K. Raghunatha, Rana, Sravendra, Lonkar, Sunil P., Raut, K.G. and Singh, Raj Pal. 2005. "Synthesis, characterization, and performance evaluation of novel stabilized TDI-based polyurethane coatings under accelerated weathering." Journal of Vinyl and Additive Technology. 11 (1), pp. 13-20. https://doi.org/10.1002/vnl.20032
Biodegradation of packaging materials: Composting of polyolefins
Pandey, Jitendra K., Kumar, A. Pratheep and Singh, R.P.. 2003. "Biodegradation of packaging materials: Composting of polyolefins." Macromolecular Symposia. 197 (1), pp. 411-420. https://doi.org/10.1002/masy.200350735