Positive streamer characteristic at the interface of TiO2 nanofluid/pressboard under lightning impulse voltage

• Published in: 2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) pp. 1 - 4
• Main Authors: Yang Ge, Hanyu Zou, Bingliang Shan, Yuzhen Lv, Meng Huang, Chengrong Li, Huamao Zhan, Jinsha Yuan
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.06.2017
• Subjects: breakdown voltage; Dielectric liquids; Flashover; Lightning; lightning impulse voltage; nanofluid; Nanoparticles; Oil insulation; oil/pressboard interface; Oils; Power transformer insulation; streamer
• ISSN: 2153-3733
• DOI: 10.1109/ICDL.2017.8124623

Recent studies have found that the creeping flashover strength of oil-impregnated pressboard can be improved by the modification of nanoparticles. To further explore the modification effect of nanoparticles, this paper studied the effect of TiO 2 nanoparticles on the creeping flashover strength of transformer oil-impregnated pressboard and its prebreakdown streamer characteristics under positive lightning impulse voltage. The test results indicate that the creeping flashover voltage is increased by 34.6% with the addition of TiO 2 nanoparticles. Furthermore, positive streamer characteristic at the interface of nanofluid/pressboard including shape, propagation length and velocity was greatly changed in the presence of nanoparticles. Streamers at the interface of pure oil/pressboard tend to propagate closely along the pressboard surface with a rapidly increased length. Whereas streamers at the interface of nanofluid/pressboard have more lateral branches extending into the surrounding oil and develop with a much shorter length. This demonstrates that the propagation of positive streamers is dramatically restrained by the addition of TiO 2 nanoparticles, resulting in the increase of creeping flashover strength.