Research of the Dielectric Loss factor tan delta of Transformer Oil by Multi-Parameter Regression Analysis

The dielectric loss factor tandelta is sensitive to the insulating ability and the aging degree of transformer oil, which is an important parameter to monitor the safe operation of transformer. The physical, chemical and electrical properties of transformer oil are affected by various factors and each one has interrelation with others. The properties of oil can be evaluated by establishing relationship model among them. The physical, chemical and electrical parameters of transformer oil have been studied with simulated thermal aging experiment and it is found there is interrelation among them. The model of functional relation for tandelta respectively with water content, flash point, viscosity, total acidity and service period are established by multiple linear regression analysis.