EVALUATION OF THE EXTENT OF AGEING OF PAPER IN OIL-IMMERSED POWER TRANSFORMERS

摘要

The paper is devoted to the analysis of problems connected with the evaluation of ageing of the insulating paper used in oil-immersed power transformers, with the numerical value of the degree of polymerization of the paper being used as a viewing angle. Results of our own experimental investigation on samples of successively ageing Kraft paper are presented. The methods of mathematical statistics, mainly regression and correlation analysis were widely used in this investigation. The presented results extend and complete the hitherto obtained conclusions which have been published in this field. The application of these results enables the owner of the oil-immersed power transformer to formulate opinion on a further operation of the installed transformer. This is especially important in case of transformers-veterans.