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Nanomaterials 2018, 8(7), 476; https://doi.org/10.3390/nano8070476

Effect of Nanoparticle Morphology on Pre-Breakdown and Breakdown Properties of Insulating Oil-Based Nanofluids

1
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
2
School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
3
School of Electrical Engineering, North China Electric Power University, Baoding 071003, China
4
State Key Laboratory of Transducer Technology, Global Energy Interconnection Research Institute Co. Ltd., Beijing 102209, China
*
Author to whom correspondence should be addressed.
Received: 7 June 2018 / Revised: 21 June 2018 / Accepted: 25 June 2018 / Published: 28 June 2018
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Abstract

Nanoparticles currently in use are challenged in further improving the dielectric strength of insulating oil. There is a great need for a new type of nanoparticle to promote the application of insulating oil-based nanofluids in electric industries. This paper experimentally investigates the effect of nanoparticle morphology on pre-breakdown and breakdown properties of insulating oil-based nanofluids. The positive impulse breakdown voltage of insulating oil can be significantly increased by up to 55.5% by the presence of TiO2 nanorods, up to 1.23 times that of TiO2 nanospheres. Pre-breakdown streamer propagation characteristics reveal that streamer discharge channels turn into a bush-like shape with much denser and shorter branches in the nanofluid with TiO2 nanorods. Moreover, the propagation velocity of streamers is dramatically decreased to 34.7% of that in the insulating oil. The greater improvement of nanorods on the breakdown property can be attributed to the lower distortion of the electric field. Thus, when compared with nanospheres, pre-breakdown streamer propagation of nanofluid is much more suppressed with the addition of nanorods, resulting in a greater breakdown voltage. View Full-Text
Keywords: nanorod; insulating oil; breakdown strength; streamer propagation; electric field nanorod; insulating oil; breakdown strength; streamer propagation; electric field
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Lv, Y.; Ge, Y.; Sun, Z.; Sun, Q.; Huang, M.; Li, C.; Qi, B.; Yuan, J.; Xing, Z. Effect of Nanoparticle Morphology on Pre-Breakdown and Breakdown Properties of Insulating Oil-Based Nanofluids. Nanomaterials 2018, 8, 476.

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