Insulating Resistance As Degradation Criterium For Power Transformers Insulation
The paper deals with the insulating resistance qf the power transformers as an aging ,criterium. This criterium is used for calculating the life-time for some types of power transformers. For the high power transformers are performed some tests: tests for the electro-insulating oil as: measurement of the winding insulation resistance and absorption coefficient, measurement of the tangent of the losses angle for the winding insulation. Those parameters could be used as degradation indices, ifthe contribution of the external factors is not very important.