Effect of acidic substances on thermal life of vegetable oil-paper insulation

The material of oil-paper insulation in transformers will generate a lot of acidic substances during the thermal aging process. These acidic substances will not only corrode metal materials, but also accelerate to degrade the oil-paper insulation as the catalyst. This paper presents the effect of acidic substances on thermal life of vegetable oil-paper insulation. By using camellia insulating oil with artificial acidic substances added, through the thermal aging experiments and the subsection sampling after aging, then performing related experiments of the samples such as degree of polymerization, furfural concentration, breakdown voltage and oil dissolved gas, the result of research shows that short-chain organic acids present a greater threat to vegetable oil-paper insulation than long-chain fatty acids.