1. (1) International Electrotechnical Commission : “Fluids for electrotechnical applications - Unused mineral insulating oils for transformers and switchgear”, IEC 60296, Ed.4.0 (2012)
2. (2) Japanese Industrial Standards : “Electrical insulating oils”, JIS C 2320 (1999) (in Japanese)
3. (3) M. Kato, N. Oota, and H. Koide : “Study on Decomposition Gases of Various Ester Insulating Oils by Local Heating”, IEEJ Trans. FM, Vol. 137, No. 4, pp. 208-214 (2017) (in Japanese)
4. (4) J. Tokunaga, H. Koide, K. Mogami, and T. Hikosaka : “Comparative Studies on the Aging of Thermally Upgraded Paper Insulation in Palm Fatty Acid Ester, Mineral Oil, and Natural Ester”, IEEE Trans. Dielectr. & Electr. Insulation, Vol. 23, No. 1, pp. 258-265 (2016)
5. (5) T. Kano : “Characteristics of Electrical Insulating Oil Made from Palm/Coconut oil and Application to Biodiesel Fuel”, J. Smart Processing, Vol. 2, No. 2, pp. 67-71 (2013) (in Japanese)