Effect of concentration on tracking failure of epoxy/TiO<sub>2</sub> nanocomposites under dc voltage

Du, B. X.; Zhang, J. W.; Liu, Yong

doi:10.1109/tdei.2012.6311524

Cited by 27 publications

(11 citation statements)

References 48 publications

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“…Figure 3 examples the discharge distribution in dielectric breakdown process. The high speed video recorded was decomposed into a series of images with dimensions of 200×200 pixels according to image processing method [17][18][19]. The three images represent discharge at different intensities, where a 1 shows the discharge at a relative low intensity, while a 2 shows stronger discharge phenomenon, and the discharge in a 3 is the most intensive among the three images.…”

Section: Dielectric Breakdownmentioning

confidence: 99%

High thermal conductivity transformer oil filled with BN nanoparticles

Xiao

2015

IEEE Trans. Dielect. Electr. Insul.

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Transformer oil is widely used in electric transformers serving the dual functions as insulating medium and cooling material. However, safety and stability of power system is interrupted due to the operation failure of electric transformers in certain case. Therefore efforts should be focused on improving the property of transformer oil for the stable operation of insulating system. The purpose of this paper is to obtain a new type of nanomodified transformer oil with improved dielectric and thermal properties. Boron nitride (BN) nanoparticles with high thermal conductivity were dispersed into transformer oil to form the nanooil. Dielectric and thermal properties of the samples before and after modification were measured. Dielectric property experiments were performed in accordance with IEC standard. Discharge phenomenon in breakdown process was captured by a high speed CCD camera. In order to investigate the effect of BN nanoparticles on thermal property, temperature change and heat distribution of the samples in heat transfer process were measured by an infrared thermal imager and a temperature sensor. It is found that the nanooil has higher dielectric breakdown strength and lower dissipation factor which indicate better dielectric property compared with nonmodified oil. Obtained results show significant improvement in heat transfer process with increasing the concentration of BN nanoparticles. It is proposed that the nanoparticles create an interfacial region which contributes to the enhancement of dielectric strength. For thermal property the ballistic phonon transport of the nanoparticles acts as the key factor in the remarkable improvement. Furthermore, the improved thermal property of the nanooil has an inhibitory effect on the breakdown process according to the bubble theory.

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Section: Dielectric Breakdownmentioning

confidence: 99%

High thermal conductivity transformer oil filled with BN nanoparticles

Xiao

2015

IEEE Trans. Dielect. Electr. Insul.

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“…Nanocomposite dielectrics have shown excellent insulation performance due to the special size effect of nanoparticles, especially in corona resistance. Plenty of researchers have added inorganic nanoparticles to the polymer matrix to prepare nanocomposite dielectrics and achieved some results in practical applications [2][3][4][5][6][7][8]. Zhong added the silane coupling agent when preparing the SiO 2 /PI composite films, the results showed that the coupling agent improved the dispersion of the nanoparticles and the interface morphology [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Molecular Structure Modification and Nano-Doping on Charge Transportation of Polyimide Films for Winding Insulation

Du¹,

Xu²,

Xing³

et al. 2021

Polyimide for Electronic and Electrical Engineering Applications

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Polyimide (PI) is widely employed as winding insulation in high voltage devices, such as extra-high voltage electric reactor and inverter-fed motor. The injection and accumulation of charges on the surface of PI films will lead to electrical field distortion and reduced lifespan of winding insulation, especially for the operation environment of high temperature and high voltage. This chapter focuses on effects of surface molecular modification and nanoparticles on dynamic characteristics of surface charge and space charge of pure PI films, including three sections. The effect of molecular structure on the surface charge dynamics of PI films was studied firstly. The chapter investigated that how molecular structure affects surface charge of polyimide nanocomposite films. Furthermore, the effect of surface molecular modification on space charge characteristics of multilayer PI films was researched. The results illustrate that surface molecular modification and nanoparticles can comprehensively suppress space charge accumulation and improve dielectric property.

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“…Although it has been shown that nanocomposites could achieve tracking resistance performance similar to microcomposites, even with smaller filler loadings [24,25], detailed analysis on tracking resistance of ATH/SiR nanocomposites with low filler loadings seems to be limited. For filler loadings lower than 10 wt %, the tracking resistance of SiO 2 /SiR nanocomposites [12] and TiO 2 /epoxy composites [26] has been reported. While [11] has verified the effectiveness of nano-sized ATH particles for outdoor insulation, filler concentrations larger than 10 wt % have been considered.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on filler characteristics, mechanical properties (e.g., tensile strength) could also be affected by filler concentration [28]. In addition, several studies have reported that the relationship between filler loading and insulation performance (e.g., tracking resistance [26] and surface flashover [29]) of nanocomposites showed a drastic change with low filler loadings. Considering such uniqueness of nano-sized particles, it is necessary to perform a detailed analysis of the effect of low filler loadings on the tracking resistance of ATH/SiR nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Effect of Filler Concentration on Tracking Resistance of ATH-Filled Silicone Rubber Nanocomposites

2019

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It is necessary for polymeric materials to have superior tracking resistance against various stress conditions for outdoor applications. In this study, the effect of nano-sized alumina tri-hydrate (ATH) particles on the tracking resistance of silicone rubber (SiR) is studied. Specimens with filler loadings of 1, 3, 5, 10, and 20 wt % are used for performance characterization. From the inclined plane test (IPT) results, apparent improvement in tracking resistance was achieved by mixing 3 wt % of nano-sized fillers, compared to unfilled specimens. ATH/SiR nanocomposites with 5 wt % loading showed comparable tracking performance to SiO2/SiR microcomposites with 20 wt % loading. For detailed analysis, measurements of surface contact angle (SCA) and surface leakage current, and thermo-gravimetric analysis (TGA) were performed. As the nano-ATH filler concentration increased, both thermal stability and leakage current characteristics were improved. Such results agreed with the tracking resistance performance by showing that thermal decomposition and surface charge transport is inhibited in ATH/SiR nanocomposites. Furthermore, performance improvement in nanocomposites was achieved, even at low filler loadings, compared to microcomposites. Meanwhile, the change in SCA was found to be rather limited, regardless of filler loading and filler size.

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Effect of concentration on tracking failure of epoxy/TiO₂ nanocomposites under dc voltage

Cited by 27 publications

References 48 publications

High thermal conductivity transformer oil filled with BN nanoparticles

High thermal conductivity transformer oil filled with BN nanoparticles

Effect of Molecular Structure Modification and Nano-Doping on Charge Transportation of Polyimide Films for Winding Insulation

Effect of Filler Concentration on Tracking Resistance of ATH-Filled Silicone Rubber Nanocomposites

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Effect of concentration on tracking failure of epoxy/TiO2 nanocomposites under dc voltage

Cited by 27 publications

References 48 publications

High thermal conductivity transformer oil filled with BN nanoparticles

High thermal conductivity transformer oil filled with BN nanoparticles

Effect of Molecular Structure Modification and Nano-Doping on Charge Transportation of Polyimide Films for Winding Insulation

Effect of Filler Concentration on Tracking Resistance of ATH-Filled Silicone Rubber Nanocomposites

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Effect of concentration on tracking failure of epoxy/TiO₂ nanocomposites under dc voltage