Measurements on pressboard to understand the effect of solid insulation condition on monitoring of power transformer winding clamping pressure
Pressboard is the main building material of a power transformer winding structure. Through-thickness compression behaviour of pressboard has a direct influence on the transformer winding clamping pressure. Being a cellulose based polymeric material with a porous structure, the through-thickness comp...
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| Published in | IET science, measurement & technology Vol. 13; no. 2; pp. 186 - 192 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
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The Institution of Engineering and Technology
01.03.2019
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| Abstract | Pressboard is the main building material of a power transformer winding structure. Through-thickness compression behaviour of pressboard has a direct influence on the transformer winding clamping pressure. Being a cellulose based polymeric material with a porous structure, the through-thickness compression behaviour of pressboard is highly non-linear. Also, the mechanical properties of pressboard are moisture, temperature, and ageing status dependent. However, information on the exact behaviour of the through-thickness compressibility of pressboard under typical operating conditions of a power transformer has not been well documented in the literature. This has posed difficulties in developing reliable techniques to detect loose clamping conditions in power transformer windings. This study presents the results of laboratory measurements on the effect of moisture, temperature and ageing on the through-thickness compression behaviour of oil-impregnated pressboard. From the measured results, it was found that the compressibility of pressboard could increase with increasing temperature, ageing and moisture ingress. It was also found that moisture and ageing tend to exaggerate the thermal softening of pressboard. Subsequent finite element analysis confirmed that transformer clamping pressure has significantly altered with the pressboard condition. |
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| AbstractList | Pressboard is the main building material of a power transformer winding structure. Through‐thickness compression behaviour of pressboard has a direct influence on the transformer winding clamping pressure. Being a cellulose based polymeric material with a porous structure, the through‐thickness compression behaviour of pressboard is highly non‐linear. Also, the mechanical properties of pressboard are moisture, temperature, and ageing status dependent. However, information on the exact behaviour of the through‐thickness compressibility of pressboard under typical operating conditions of a power transformer has not been well documented in the literature. This has posed difficulties in developing reliable techniques to detect loose clamping conditions in power transformer windings. This study presents the results of laboratory measurements on the effect of moisture, temperature and ageing on the through‐thickness compression behaviour of oil‐impregnated pressboard. From the measured results, it was found that the compressibility of pressboard could increase with increasing temperature, ageing and moisture ingress. It was also found that moisture and ageing tend to exaggerate the thermal softening of pressboard. Subsequent finite element analysis confirmed that transformer clamping pressure has significantly altered with the pressboard condition. |
| Author | Ekanayake, Chandima Saha, Tapan K Naranpanawe, Lakshitha |
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| Cites_doi | 10.1016/j.jmps.2015.07.002 10.3183/NPPRJ-2008-23-04-p432-437 10.1039/f29848000291 10.1109/MEI.2006.1618969 10.1109/TDEI.2017.006206 10.1021/ma60053a026 10.1021/ja01151a062 10.1063/1.1713105 10.1007/s10570-007-9192-2 10.1016/0141-3910(95)00023-F 10.1002/polc.5070110105 10.1016/0141-3910(95)00100-Z |
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| Keywords | through-thickness compression behaviour moisture ingress ageing power transformers through-thickness compressibility moisture finite element analysis oil-impregnated pressboard transformer windings power transformer winding structure pressboard condition transformer clamping pressure power transformer windings transformer oil power transformer testing loose clamping conditions power transformer insulation |
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| Snippet | Pressboard is the main building material of a power transformer winding structure. Through-thickness compression behaviour of pressboard has a direct influence... Pressboard is the main building material of a power transformer winding structure. Through‐thickness compression behaviour of pressboard has a direct influence... |
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| SubjectTerms | ageing finite element analysis loose clamping conditions moisture moisture ingress oil‐impregnated pressboard power transformer insulation power transformer testing power transformer winding structure power transformer windings power transformers pressboard condition Research Article through‐thickness compressibility through‐thickness compression behaviour transformer clamping pressure transformer oil transformer windings |
| Title | Measurements on pressboard to understand the effect of solid insulation condition on monitoring of power transformer winding clamping pressure |
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