Interaction between Insulating Paper and Transformer Oil: Bacterial Content and Transport of Sulfur and Nitrogen Compounds.

The article discusses a study which examines the sulfur content, bacterial content and level of sulfur and nitrogen leaching for commercial insulating papers. It explores the experimental method used such as sulfur analysis, bacteria analysis and leaching analysis. The study uses insulating electrical papers from well-known manufacturers and evaluates their Kraft and thermally upgraded qualities. It is concluded that different insulating papers contain significant amounts of sulfur which showed little migration. The increase of nitrogen content in oil exposed to thermally upgraded paper is said to suggest that migration from a transformer paper contributes to the amount of nitrogen-containing substances found in transformer oil.