Sources of water contamination in transformers with Mineral oil – cellulose paper systems

There are three main sources of excessive moisture in a transformer Residual Moisture Even after the transformer core’s drying, there might still be some residual moisture in some parts. These are usually in the more significant parts like wood, plastic, and resin-impregnated parts. These would need much longer drying times than cellulose paper and pressboard.…

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A comparative study: Aging behavior of mineral and ester liquids

Comparing mineral and ester oil aging behavior Electrical, thermal, mechanical, and chemical stress leads to the aging of insulating liquids.  Breakdown of the hydrocarbon chain of transformer liquids generates soluble gases and a colloidal suspension. This suspension aids the further oxidation of the oil. Oxygen contributes to the formation of soluble oxidation products as well as…

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Health Index Determination for Power Transformer – Part II

The health indices are an objective and quantitative representation of the health of the asset incorporating data obtained by operating observations, field inspections, site, and laboratory testing. This is a powerful tool for asset management and identifying and prioritizing investment needs. This is clearly set out in budget planning and capital application. The maintenance program…

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