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. …

Moisture control in power transformers filled with mineral oil

Sources of moisture in the transformer system Moisture is formed in the transformer through the degradation processes of both oil and cellulose paper. There can be an ingress of water through gaskets that does not seal properly and moisture is pulled in when the transformer cools down during the night or when the load is …