Study on the characteristics of the ester insulating oil, and material properties in the case of applying to the transformer

エステルケイ　ゼツエンユ　ノ　トクセイ　ト　ヘンアツキ　ヘ　テキヨウ　シタ　バアイ　ノ　ザイリョウ　トクセイ　ニ　ツイテ

Kurihar, Fumio

デンキ　ザイリョウ　ギジュツ　コンダンカイ

エステル系絶縁油

電気特性

材料適合性

絶縁紙劣化

transformer

ester

electrical properties

material compatibility

paper degradation

Recently, it is necessary to consider the environment friendly in the power utility equipment. In the transformer, it has been developed to which the ester-based insulating oil to replace the mineral oil. In a various ester oils, the authors conducted a comparison and verification for hygroscopic, electrical characteristics, breakdown voltage of the oil-impregnated paper, the various properties after degradation with the mineral oil. As a result, in comparison to mineral oil, ester oil is highly hygroscopic. And it was confirmed to have the same performance that electrical properties , change in the electrical characteristics relative to moisture absorption, breakdown voltage of the oil-impregnated paper and various characteristics after deterioration. Also we have verified compatibility with the transformer materials such as rubber, resin and some adhesives. As a result, although it is necessary to pay attention for some materials, they were confirmed good compatibility. And we conducted experiments to investigate the aging of paper in Palm Fatty Acid Ester (PFAE) and mineral oil. As a result, paper was found to degrade slower in PFAE than in mineral oil in a high temperature, high moisture content, nitrogen atmosphere. Applying PFAE, it suggests that it is possible to expect the equivalent or more insulating paper life compared to mineral oil filled transformers.