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The lifespan of a transformer with oil-cellulose-insulation is, in the end, dependent upon the aging of the cellulose. While the insulating oil can be reprocessed or renewed, the aging of the cellulose is an irreversible process. The current condition of aged cellulose is described by the degree of polymerization (DP). When it is new, the insulating paper has a DP-value in the range of between 1000...
Transformers are the vital section of transmission and distribution electrical network. In addition, they are the most expensive investment in the network. Therefore, they should be evaluated for proper working and monitor regularly to assess normal condition and life expectancy. Obviously, the health of transformer is strictly depending on transformer's insulation conditions, oil and paper, that...
A resolved gas analysis method has been one of the most important evaluation methods of the degradation of insulation paper in power transformers. However the resolved gas analysis method requires special care to sample the oil and takes time to get the result. Instead of resolved gas analysis method to estimate the degradation of the paper, it is found that a simple relationship between the partial...
A power transformer is expected to operate up to 40 years. With current cost-benefit calculations, the user is forced to perform maintenance that will bring a further extension of transformer life. The maintenance can only be based on on-site and off-site monitoring with extended analytical and electrical tests, which can define the service condition of the transformer and predict its further life...
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