What is it about?

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.

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Why is it important?

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.

Perspectives

It has also been identified that changes in the moisture content and repetitive compression cycles on the pressboard during high current faults tend to change the winding clamping pressure.

Dr Pratheep K Annamalai
University of Queensland

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This page is a summary of: Influence of moisture dependency of pressboard on transformer winding clamping pressure, IEEE Transactions on Dielectrics and Electrical Insulation, October 2017, Institute of Electrical & Electronics Engineers (IEEE), DOI: 10.1109/tdei.2017.006206.
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