A Comparison of the Formation of Bubbles and Water Droplets in Vegetable and Mineral Oil Impregnated Transformer Paper

作者：Perkasa Caesar Y^*; Lelekakis Nick; Czaszejko Tadeusz; Wijaya Jaury; Martin Daniel

来源：IEEE Transactions on Dielectrics and Electrical Insulation, 2014, 21(5): 2111-2118.

DOI：10.1109/TDEI.2014.004493

• Bubbling
• moisture
• overload
• paper insulation
• transformer
• vegetable oil

Bubble formation from paper insulation during overload is important to understand because it can cause a transformer to fail. This phenomenon has been investigated in a mineral oil-paper system, but not in vegetable oil. This study investigated bubble formation during overload in a vegetable oil impregnated paper system and the results were compared to a mineral oil (Shell Diala B) which was studied previously using similar test equipment and method. The limiting hot-spot temperatures for bubbles and water droplets in vegetable oil for paper with water content between 1 - 6 % were determined. The water content of paper measurement which is critical when setting the winding temperature limit was evaluated using both a moisture sensor and Karl-Fischer titration method.

• 出版日期2014-10