Influence of nano-fillers on electrical treeing in epoxy insulation

Alapati, Sridhar; Thomas, M. Joy

doi:10.1049/iet-smt.2011.0046

Cited by 55 publications

(24 citation statements)

References 18 publications

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“…Nanocomposites with nanofiller took a long time to initiate compared to unfilled SiR. This result agrees with the result from Alapati et al's work [18]; they showed that even small amounts of added nanofiller led to significant improvements in tree initiation times. Our study has shown, however, that the STNC has a faster initiation time compared to DMNC and PTNC.…”

Section: Electrical Tree Parameterssupporting

confidence: 83%

“…From the results, it is clear that the growth rate of the electrical tree decreased with an increase in nanofiller loading; the decrease was significant in 1 wt % growth-rate nanocomposites compared to unfilled SiR. This result agrees with that of Ahmad et al [18], who found that small amounts of nanofiller (1 wt %) exhibited a slow propagation time, which resulted in slow growth rates compared to unfilled samples. In addition, from this result, it can be seen PTNC showed the slowest growth rate compared to that of DMNC and STNC.…”

Section: Electrical Tree Parameterssupporting

confidence: 82%

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Investigating the Influence of Plasma-Treated SiO2 Nanofillers on the Electrical Treeing Performance of Silicone-Rubber

et al. 2016

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This study presents an investigation of electrical tree performance as well as the effect of filler concentration of silicone rubber (SiR) filled with atmospheric-pressure plasma-treated silicon dioxide (SiO2) nanofiller. Atmospheric-pressure plasma was used to treat the SiO2 nanofiller surfaces to enhance compatibility with SiR matrices. A fixed AC voltage of 10 kV, 50 Hz was applied to untreated, silane-treated, and plasma-treated nanocomposites with filler concentrations of 1, 3, and 5 wt % to investigate their electrical performance during electrical treeing. The result showed that plasma-treated SiO2 nanoparticles were uniformly well dispersed and formed strong covalent bonds with the molecules of the SiR polymer matrix. The plasma-treated nanocomposites were able to resist the electrical treeing better than the untreated or silane-treated nanocomposites. The increase in filler concentration enhanced the electrical tree performances of the nanocomposites. The result from this study reveals that the plasma-treated nanocomposites exhibited the best result in inhibiting the growth of electrical treeing compared to the existing surface treatment methods used in this study.

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Section: Electrical Tree Parameterssupporting

confidence: 83%

Section: Electrical Tree Parameterssupporting

confidence: 82%

Investigating the Influence of Plasma-Treated SiO2 Nanofillers on the Electrical Treeing Performance of Silicone-Rubber

et al. 2016

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“…In cables, voids can be controlled by heating the cable using ultrasonic, infrared, or electron beams to high temperatures, while under high pressure .…”

Section: Electrical Treeingmentioning

confidence: 99%

Characterization of electrical trees in Bakelite insulator by fractal analysis

Kanchana

2014

Int. Trans. Electr. Energ. Syst.

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Electrical trees are characterized by a technique of fractal characteristics in pattern formation for decades. The geometrical patterns of dielectric breakdown such as lightning discharge, surface discharges, and electrical trees are known to be fractal in nature. It is well known that the electrical trees are frequently occurring in insulating materials. The present investigation deals mainly with the fractal properties of 2D (Dimension) patterns of real electrical tree obtained in insulating materials. The electrical tree patterns are generated experimentally under AC and DC of different voltage levels. The time of voltage application is noted, and the leakage current is measured using digital storage oscilloscope. A charge-coupled device (CCD) camera is used to record the propagation of electrical tree during the experiment. C++ is used to calculate the fractal dimension for experimentally obtained electrical trees by using box counting method. It is found that fractal dimension is a function of magnitude of the voltage, treeing time, and leakage current. Fractal analysis is a good and suitable tool for the analysis of electrical treeing.

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“…Therefore, improving electrical tree resistance to enhance the reliability of polymer insulation has become an important issue [7][8][9][10]. The development of nanotechnology provides new ways to modify the performance of a polymer; several researches show that adding nanofiller in a polymer considerably improves the dielectric properties, including electrical tree resistance [11][12][13][14][15][16]. However, the mechanism of nanofiller effects on electrical tree in a polymer should be further researched.…”

Section: Introductionmentioning

confidence: 99%

Electrical tree propagating characteristics of polyethylene/nano-montmorillonite composites

Chi

Gao

Zhang

2015

IEEE Trans. Dielect. Electr. Insul.

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Electrical tree occurring in polymer insulation limits the applications and reduces the service lifetime of power equipment. To improve electrical tree resistance in polymer insulation, polyethylene (PE) nanocomposites with nano-montmorillonite (MMT)layered fillers are compounded and investigated in terms of electrical tree characteristics. By an organization process, intercalation and coupling agents are used to modify the inorganic-layered MMT nanofillers in sequence. Polyethylene/nanomontmorillonite (PE/MMT) composites with different MMT contents are prepared by melting intercalation. Fourier transform infrared spectrophotometry is used to determine the chemical characteristics of the MMT in different surface-modification stages. The crystalline morphologies and MMT distributions in the composites are characterized by polarizing microscopy and scanning electron microscopy. The electrical tree propagating characteristics and corresponding conduction properties of the PE and PE/MMT composites are investigated. Results show that the electrical tree resistance of PE/MMT composites significantly improves. The electrical tree length decreases and the fractal dimension increases in PE/MMT composites compared with pure PE. After performing electrical tree initiation, conductive current slightly increases in composites but decreases in PE. This result suggests that the characteristics and conductive mechanism of electrical tree differ between PE and PE/MMT.Index Terms -Polyethylene/nano-montmorillonite composites, electrical tree, conductive current, conductive mechanism of tree channels.

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Influence of nano-fillers on electrical treeing in epoxy insulation

Cited by 55 publications

References 18 publications

Investigating the Influence of Plasma-Treated SiO2 Nanofillers on the Electrical Treeing Performance of Silicone-Rubber

Investigating the Influence of Plasma-Treated SiO2 Nanofillers on the Electrical Treeing Performance of Silicone-Rubber

Characterization of electrical trees in Bakelite insulator by fractal analysis

Electrical tree propagating characteristics of polyethylene/nano-montmorillonite composites

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