Journal ArticleDOI
Creeping Discharge Characteristics of Nanofluid-Impregnated Pressboards Under AC Stress
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In this article, the authors present experimental research on creeping discharge characteristics of TiO2 nanofluid-impregnated pressboards (NPs) under sustained ac voltage.Abstract:
This paper presents experimental research on creeping discharge characteristics of TiO2 nanofluid-impregnated pressboards (NPs) under sustained ac voltage. It was found that NPs possess higher resistance to creeping discharge than that of pure oil-impregnated pressboard. The results of permittivity and surface charge accumulation and decay characteristics reveal that the modification of nanoparticles can not only make the electric field more uniformly distributed at the interface of nanofluid/pressboard due to a better matching in permittivity but also significantly increase the surface charge decay rate via a trapping and detrapping process in shallower traps. Thus, the creeping discharge characteristics of NPs are greatly improved by the modification of TiO2 nanoparticles.read more
Citations
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Journal ArticleDOI
Effect of nanoparticle shapes on creeping flashover characteristics at the interface of nanofluid-impregnated pressboard
TL;DR: In this article, the effect of nanoparticles shapes on creeping flashover characteristics at the interface of nanofluid-impregnated pressboard (NP) was investigated and the results showed that the modifications by spherical and rod nanoparticles have a specific surface area 13 times as large as that of nanorods at the same concentration, and it is a source of shallow traps.
Journal ArticleDOI
Evaluation of dielectric breakdown strength of transformer oil with BaTiO 3 and NiFe 2 O 4 nanoparticles
Sherif S. M. Ghoneim,Sherif S. M. Ghoneim,Nehmdoh A. Sabiha,Mahmoud M. Hessien,Mahmoud M. Hessien,Ahmad Alahmadi +5 more
TL;DR: In this article, two nanocrystalline powders, barium titanate (BaTiO3) and nickel ferrite (NiFe2O4), are synthesized via the tartaric acid precursor method.
Journal ArticleDOI
Research on Creeping Flashover Characteristics of Nanofluid-Impregnated Pressboard Modified Based on Fe₃O₄ Nanoparticles under Lightning Impulse Voltages.
Bingliang Shan,Meng Huang,Yupeng Ying,Mingkang Niu,Qian Sun,Yuzhen Lv,Chengrong Li,Bo Qi,Xing Zhaoliang +8 more
TL;DR: The creepingFlashover characteristics of oil-impregnated pressboard were greatly improved with Fe3O4 nanoparticles, and it was found that NIP possessed higher resistance to creeping flashover than OIP.
Journal ArticleDOI
Thermal Aging Effect on Properties of Pure and Doped Nano-TiO 2 Cellulose Pressboard
TL;DR: In this article, nano-TiO 2 of various diameters is added to cellulose and pressboard is made to enhance its anti-thermal aging characteristics, and the results show that the dielectric properties of the pressboard made with 10 nm TiO 2 has the highest AC breakdown due to closer match of the relative permittivity.
Journal ArticleDOI
Creeping flashover characteristics improvement of nanofluid/pressboard system with TiO2 nanoparticles
TL;DR: In this article, Cheng et al. studied the effect of different sizes of nanoparticles on the creeping flashover performance at the interface between oil and pressboard in transformer and presented the mechanism for the mechanism.
References
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Journal ArticleDOI
Effects of nanoparticle charging on streamer development in transformer oil-based nanofluids
J. George Hwang,Markus Zahn,Francis O'Sullivan,Leif A. A. Pettersson,Olof Hjortstam,Rongsheng Liu +5 more
TL;DR: In this paper, the authors showed that transformer oil-based nanofluids with conductive nanoparticle suspensions have substantially higher positive voltage breakdown levels with slower positive streamer velocities than that of pure transformer oil.
Journal ArticleDOI
Effect of semiconductive nanoparticles on insulating performances of transformer oil
Yuefan Du,Yuzhen Lv,Chengrong Li,Mutian Chen,Yuxiang Zhong,Jianquan Zhou,Xiao-xin Li,You Zhou +7 more
TL;DR: In this paper, a TiO2 semiconductive nanoparticles with a large relaxation time constant is added into transformer oil to form semiconductorive nanofluids (SNFs), with the aim of enhancing insulating characteristics.
Journal ArticleDOI
Tracking and surface discharge at the oilߝpressboard interface
TL;DR: A different approach to the study of surface tracking reveals a new view of the oil-pressboard interface and suggests a link between the electric double layer and the boundary layer as discussed by the authors.
Journal ArticleDOI
Creepage discharge on insulation barriers in aged power transformers
TL;DR: In this paper, the authors used point-to-plate electrode configurations under AC voltages for both single flashover breakdown and partial discharge induced failure modes, and found that increased moisture content in pressboard reduces partial discharge inception voltage (PDIV) significantly, i.e. ~30% PDIV reduction for pressboard of up to 3% moisture.
Journal ArticleDOI
Suppression of Static Electrification of Insulating Oil for Large Power Transformers
TL;DR: In this article, the authors discussed the characteristics of the insulating oils used in large power transformers and proposed a method for streaming electrification of large transformers from the point of view of characteristics of these oils.