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
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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.Abstract:
In this paper, TiO2 semiconductive nanoparticles with a large relaxation time constant is added into transformer oil to form semiconductive nanofluids (SNFs), with the aim of enhancing insulating characteristics. ac, dc and lightning impulse breakdown voltage and partial discharge (PD) characteristics of oil samples before and after modification were measured according to ASTM standard methods. It was found that SNFs have ac, dc and lightning impulse breakdown voltage up to 1.2 times compared with pure oil. Meanwhile, the partial discharge resistance of SNFs was also dramatically improved. Charge trap and transportation characteristics of both samples have been measured by thermally stimulated current method (TSC) and pulse electroacoustic technique (PEA). It was found that electron shallow trap density and charge decay rate are greatly increased in semiconductive nanoparticles modified transformer oil. It is proposed that electron trapping and de-trapping processes in the shallow traps could be one of the main charge transport processes in dielectric liquids.read more
Citations
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Dispersion behavior and breakdown strength of transformer oil filled with TiO 2 nanoparticles
TL;DR: In this paper, the effect of surfactant concentration on dispersion behavior and agglomerate size of transformer oil-based nanofluids was investigated using optical microscope analysis, transmission electron microscope (TEM) analysis and zeta potential measurements.
Journal ArticleDOI
A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids
TL;DR: In this paper, a review of the use of nanofluids as transformer oils is presented and their advantages are described in comparison with mineral oil, as well as scope and challenges are clearly presented.
Journal ArticleDOI
Experimental evaluation of thermal conductivity, viscosity and breakdown voltage AC of nanofluids of carbon nanotubes and diamond in transformer oil
TL;DR: In this article, the thermal conductivity, viscosity and breakdown voltage of solutions of diamond nanoparticles and multiwalled carbon nanotubes dispersed in mineral insulating oil for electrical transformers were measured using the transient hot wire method.
Journal ArticleDOI
Recent progress in nanofluids based on transformer oil: preparation and electrical insulation properties
TL;DR: In this paper, a new kind of oil-paper insulation system, with higher dielectric strength and smaller volume compared with conventional insulation systems, was developed to reduce the volume and mass of high-voltage power transformers and improve their long-term operational reliability.
Journal ArticleDOI
Insulating properties and charge characteristics of natural ester fluid modified by TiO 2 semiconductive nanoparticles
Yuxiang Zhong,Yuzhen Lv,Chengrong Li,Yuefan Du,Mutian Chen,Shengnan Zhang,You Zhou,Long Chen +7 more
TL;DR: In this article, the authors showed that TiO2 nanoparticles can accelerate the charge dissipation rate and uniform the electric field and increase the shallow trap density in the ester-based nanofluid.
References
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On the analysis of thermally stimulated processes
TL;DR: In this article, the activation energy, the pre-exponential factor and the kinetic order of a thermoluminescence (TL) curve are evaluated for a series of related thermally stimulated phenomena which are governed by similar differential equations.
Book
Analysis of thermally stimulated processes
Reuven Chen,Yoram Kirsh +1 more
TL;DR: In this article, a series of measurements of thermally stimulated curves is used to evaluate parameters from thermally induced curves, and the results of these measurements are applied to experimental results.
Journal ArticleDOI
Internal charge behaviour of nanocomposites
TL;DR: In this article, the incorporation of 23 nm titanium dioxide nanoparticles into an epoxy matrix to form a nanocomposite structure is described, and it is shown that the use of nanometric particles results in a substantial change in the behavior of the composite, which can be traced to the mitigation of internal charge when a comparison is made with conventional TiO2 fillers.
Journal ArticleDOI
The mechanisms leading to the useful electrical properties of polymer nanodielectrics
TL;DR: In this article, the authors present the following hypothesis for the mechanisms leading to improved properties of polymer nanocomposites with metal oxide nanoparticle fillers: the inclusion of nanoparticles provides myriad scattering obstacles and trap sites in the charge carriers' paths, effectively reducing carrier mobility and thus carrier energy.
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.