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Transformer ageing assessment is an essential step towards facilitating asset management decisions and it involves the interpretation of oil test results normally recorded in a huge database for a large population of in-service transformers. In addition to the need for analysing individual transformer data, this study aims to demonstrate and illustrate some typical challenges that asset managers could...
A post mortem analysis of scrapped transformers provides an opportunity to directly measure the properties of in-service aged paper insulation. Investigations on 10 scrapped 275 kV and 400 kV power transformers were carried out, where Tensile Index (TI) and Low Molecular Weight Acid (LMA) of the paper insulation sampled from various locations were measured. Multiple-layer TI profile demonstrated the...
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