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A fully enclosed oil circulation rig has been made for studying the temperature-dependent equilibrium distribution of contaminants between oil-impregnated cellulose materials and oil. This is relevant for the distribution of contaminants in the solid insulation in power transformers. Used with clean, new material the rig gave humidity equilibrium results reasonably close to results found in literature...
Utilities need to ensure high reliable power grids that are cost-efficient as well. Periodic replacements are costly. So utilities try to extend the life-span of their power transformers. However, the older power transformers the higher the effort for maintenance and repair. Thus it is necessary to provide just the right maintenance and repair capacity to ensure a certain reliability of supply. Hence,...
This paper reports on continuing work undertaken within Powerlink Queensland of Australia in the analysis and interpretation of aged insulation from operating power transformers. The paper cites the results of a recent survey supporting the need for more research in this field and describes some recent advances in technique for estimating remaining insulation life through assessment of furan content...
The life of a transformer is limited to the deterioration of its solid insulation. Winding conductors and other solid insulation materials in oil-immersed transformers have been insulated using cellulose products. For many years, manufacturers have met the needs of special applications by designing transformers using thermally upgraded materials to achieve lighter weight, higher power density and...
Power transformers are considered critical equipment in an electric power transmission system. Electric utilities worldwide are now focusing on reliability centered maintenance of their assets for extended life and hence maximum return on investment. Recent utility survey shows that a large proportion of transformers has attained their designed life and is operating close to their nameplate rating...
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