Low Temperature Overheating Test in Insulating Oil on Insulating Paper with Different Degree of Polymerization

摘要

Dissolved Gas Analysis (DGA) is widely used in power transformer condition diagnostics recently. DGA can depict internal power transformer phenomena including localized overheating. In this study, low temperature overheating experiment is conducted. The experiment using mineral oil and insulating paper with various degree of polymerization (new paper, DP560 and DP390) as the test specimen which is heated by various temperature (200°C, 175°C, 150°C and 125°C) continuously in 12 hours. It was found that the amount of generated gasses, especially CO and CO_2, is different for various degradation condition of insulating paper.