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 |
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ERA Journal ID | 4449 |
Article Category | Article |
Authors | Naranpanawe, Lakshitha, Ekanayake, Chandima, Saha, Tapan Kumar and Annamalai, Naranpanawe1, Chandima Ekanayake2, Tapan Kumar Saha1 and Pratheep K. |
Journal Title | IEEE Transactions on Dielectrics and Electrical Insulation |
Journal Citation | 24 (5), pp. 3191-3200 |
Number of Pages | 10 |
Year | 2017 |
Publisher | IEEE (Institute of Electrical and Electronics Engineers) |
Place of Publication | United States |
ISSN | 1070-9878 |
1558-4135 | |
Digital Object Identifier (DOI) | https://doi.org/10.1109/Tdei.2017.006206 |
Web Address (URL) | https://ieeexplore.ieee.org/document/8120379 |
Abstract | Short 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. |
Keywords | power transformer; winding clamping pressure; cellulose; stressstrai; hysteresis; hygroscopic swelling |
ANZSRC Field of Research 2020 | 400805. Electrical energy transmission, networks and systems |
401610. Timber, pulp and paper | |
340305. Physical properties of materials | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Queensland |
Griffith University |
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