METHOD FOR EVALUATING DETERIORATION OF INSULATING PAPER

摘要

According to the present invention, insulating paper immersed in an oil is heated and deteriorated at a temperature up to 110 DEG C which is in an operating temperature region for an oil-filled electric apparatus, and the value of the degree of the polymerization which decreases with the deterioration of the insulating paper and amount of carbon dioxide and carbon monoxide which is generated by the heat decomposition of the insulating paper and which is dissolved in the insulating oil are used to observe the generation rate thereof. The present invention is a method of evaluating deterioration characteristics of insulating paper from the change of the degree of polymerization with passage of time and from the temperature dependence of the gas generation rate. The deterioration of the insulating paper has different aspects in the regions higher and lower than 110 DEG C, and the deterioration characteristics of the insulating paper on the low temperature side can be accurately evaluated. <IMAGE>