Statistical Analysis of the Influence of Various Temperatures on the Drying Time of Transformer Insulation in Vacuum Drying Process

Cellulose based material like paper & pressboards form a very important feature of the transformer construction process. The life end of a transformer depends on the state of cellulose insulation materials like paper & pressboards. Paper with 1.5% moisture content ages 10 times faster than with only 0.3% moisture. It is very critical that the moisture is removed from transformer insulation. For this purpose vacuum drying has been conventionally used in industries. This paper evaluates the influence of temperatures at various locations on the drying time of the transformer insulation in vacuum drying.