This paper reports the experimental results on the characteristic of thermal aging in oil paper insulation on Dielectric Properties and DGA. Samples are conditioned to the same initial conditions through the heating at a temperature of 100 °C for 24 hours. A number of mineral oil samples with volume of 800 ml and 6 gram insulating Kraft paper were put in hermetical bottles. The bottles containing oil and paper samples were subjected to thermal aging at 120°C and 1S0°C. Thermal aging condition was done after aging time of 2 weeks to 4 weeks. The results showed that the dielectric properties will decrease with the increasing duration and temperature of aging. From these experiments obtained CO gases, produced from thermal degradation of paper cellulose chain. H2 and C2H2 gases are not generated in this experiment but increase concentration of CH4, C2H4 and C2H6. The gas produced from the effect of thermal aging in oil paper insulation. And then, this treatment would cause influential damage for insulation quality of mineral oil.
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