A comparison of the formation of bubbles and water droplets in vegetable and mineral oil impregnated transformer paper

Caesar Yudha Perkasa, Nick Lelekakis, Tadeusz Czaszejko, Jaury Adi Wijaya, Daniel David Martin

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43 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)2111 - 2118
Number of pages8
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume21
Issue number5
DOIs
Publication statusPublished - 23 Oct 2014

Keywords

  • power transformer insulation
  • vegetable oil
  • bubble formation
  • Moisture content
  • overload

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