Influence of moisture dependency of pressboard on transformer winding clamping pressure

Naranpanawe, Lakshitha, Ekanayake, Chandima, Annamalai, Pratheep K. and Saha, Tapan Kumar (2017) Influence of moisture dependency of pressboard on transformer winding clamping pressure. IEEE Transactions on Dielectrics and Electrical Insulation, 24 5: 3191-3200. doi:10.1109/TDEI.2017.006206


Author Naranpanawe, Lakshitha
Ekanayake, Chandima
Annamalai, Pratheep K.
Saha, Tapan Kumar
Title Influence of moisture dependency of pressboard on transformer winding clamping pressure
Journal name IEEE Transactions on Dielectrics and Electrical Insulation   Check publisher's open access policy
ISSN 1070-9878
1558-4135
Publication date 2017-10-01
Year available 2017
Sub-type Article (original research)
DOI 10.1109/TDEI.2017.006206
Open Access Status Not yet assessed
Volume 24
Issue 5
Start page 3191
End page 3200
Total pages 10
Place of publication Piscataway, NJ United States
Publisher Institute of Electrical and Electronics Engineers
Language eng
Subject 2208 Electrical and Electronic Engineering
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.
Keyword Cellulose
Hygroscopic swelling
Hysteresis
Power transformer
Stress-strain
Winding clamping pressure
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Sun, 31 Dec 2017, 17:22:50 EST