Electrical Treeing in Polymer Nanocomposites

Alapati, Sridhar; Thomas, Joy M

doi:10.2202/1553-779x.2234

Cited by 18 publications

(16 citation statements)

References 8 publications

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“…The tree does not propagate through the nanoparticles, because they have higher dielectric strength than the polymer matrix, and are more resistant to partial discharges. The electrical tree grows around the nanoparticles forming a zigzag pattern [9][10][11]. Electrical tree can appear under both DC and AC voltages.…”

Section: Present Understanding Of Tree Initiation and Propagationmentioning

confidence: 99%

“…The first model refers to the slow tree propagation which is exhibited at low electric field. The tree propagates through the polymer and every time that a tip of the tree collides with a nanoparticle, the propagation continues through the interface between the polymer and the nanoparticle [9,14]. Partial discharges are the main reason for tree propagation at low electric field, whereas, according to the second model, under higher voltages charge injection and electron avalanches lead to tree propagation, where the tree propagates through the polymer matrix without contacting the nanoparticles [14].…”

Section: Present Understanding Of Tree Initiation and Propagationmentioning

confidence: 99%

“…Partial discharges are the main reason for tree propagation at low electric field, whereas, according to the second model, under higher voltages charge injection and electron avalanches lead to tree propagation, where the tree propagates through the polymer matrix without contacting the nanoparticles [14]. Nanoparticles act as barriers to electrical tree propagation and enforce the tree channels to move around the nanoparticles and not straightforward, not only under the application of AC voltage [9,11] but also under the application of DC voltage [15]. The DC resistivity of epoxy-ZnO nanocomposites increases, while increasing ZnO loading.…”

Section: Present Understanding Of Tree Initiation and Propagationmentioning

confidence: 99%

“…A possible solution, which describes the interaction between two identical spheres under the influence of an electric field, is Eqs. (9), (10). The direction of this electric field is parallel to the imaginary line that unites the centers of the two particles.…”

Section: Simulation Details and Processmentioning

confidence: 99%

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Influence of homocharges and nanoparticles in electrical tree propagation under DC voltage application

et al. 2011

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The influence of nanoparticles and homocharges on the propagation of electrical treeing in polymer insulation is examined for a needle-plane electrode arrangement. A simulation is carried out using a model based on Cellular Automata (CA). A DC voltage application on the needle electrode is assumed. Nanoparticles are introduced in the polymer matrix in the vicinity of the needle electrode, and simulations with different homocharge densities are performed. It is confirmed that the propagation of electrical trees is hindered by the presence of nanoparticles and homocharges. A larger quantity of homocharges forms a barrier to the injection of charge carriers in the nanocomposite sample. Electrical trees seem to go around and/or stop at nanoparticles and thus, their propagation becomes more difficult. In other words, the proposed simulations show that electrical trees follow a tortuous path, avoiding the nanoparticles.

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Section: Present Understanding Of Tree Initiation and Propagationmentioning

confidence: 99%

Section: Present Understanding Of Tree Initiation and Propagationmentioning

confidence: 99%

Section: Present Understanding Of Tree Initiation and Propagationmentioning

confidence: 99%

Section: Simulation Details and Processmentioning

confidence: 99%

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Influence of homocharges and nanoparticles in electrical tree propagation under DC voltage application

et al. 2011

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“…Highly improved characteristics of insulation through the use of nanofillers have given a new perspective for epoxy nanocomposites. Remarkable findings such as prolongation of tree initiation and propagation [37], improved performance towards voltage endurance and partial discharge studies due to mitigation of polarization at interfaces by Maxwell-Wagner effect, low permittivity, tan delta and resistivity values, significant improvement in corona resistance, reduced space charge [48][49][50][51][52][53] are reported.…”

Section: Epoxy Nanocompositesmentioning

confidence: 99%

A Review on Nanocomposite Based Electrical Insulations

Paramane¹,

Kumar²

2016

Transactions on Electrical and Electronic Materials

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The potential of nanocomposites have been drawing the intention of the researchers from energy storage to electrical insulation applications. Nanocomposites are known to improve dielectric properties, such as the increase in dielectric breakdown strength, suppressing the partial discharge (PD) as well as space charge, and prolonging the treeing, etc. In this review, different theories have been established to explain the reactions at the interaction zone of polymer matrix and nanofiller; the characterization methods of nanocomposites are also presented. Furthermore, the remarkable findings in the fields of epoxy, cross-linked polyethylene (XLPE), polypropylene and polyvinyl chloride (PVC) nanocomposites are reviewed. In this study, it was observed that there is lack of comparison between results of lab scale specimens and actual field aged cables. Also, non-standardization of the preparation methods and processing parameters lead to changes in the polymer structure and its surface degradation. However, on the positive side, recent attempt of 250 kV XLPE nanocomposite HVDC cables in service may deliver a promising performance in the coming years. Moreover, materials such as self-healing polymer nanocomposites may emerge as substitutes to traditional insulations.

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Application of Cold Plasma in Nanofillers Surface Modification for Enhancement of Insulation Characteristics of Polymer Nanocomposites: A Review

2021

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Polymer nanocomposites have gained much attention among researchers due to their excellent characteristics, such as high thermal resistivity and the ability to withstand higher electrical stress. Introducing nanoparticles into the polymer matrix can further improve the insulation characteristics. However, the effectiveness of nanocomposite polymer to suppress an electrical tree, enhancing the partial discharge, and increase the breakdown strength is still a question mark due to the agglomeration issue of nanoparticles, which causing the nanoparticle to be dispersed non-uniformly within the polymer matrix. Plasma treatment is one of the methods that potentially replace conventional modification techniques such as chemical functionalization and heat treatment to improve the dispersion of nanoparticles, nanocomposite bonding, and the compatibility between polymer-nanoparticle interfaces. By altering the surface of nanoparticles using cold plasma with a glow discharge mechanism, the surface morphology of nanoparticles can be modified in terms of chemical structure, which indirectly solves the nanoparticle agglomeration. This study presents a review on the application of cold plasma in surface modification to enhance insulation characteristics of nanocomposite polymers. Various polymer hosts combined with different untreated and plasma-treated nanofillers are also reviewed. The trends on nanomaterial surface modification using the cold plasma technique based on its operating pressure to improve the dielectric properties of nanocomposite polymers are also discussed accordingly.INDEX TERMS Cold plasma, nanofillers surface modification, nanocomposites polymer, and plasma treatment.

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Electrical Treeing in Polymer Nanocomposites

Cited by 18 publications

References 8 publications

Influence of homocharges and nanoparticles in electrical tree propagation under DC voltage application

Influence of homocharges and nanoparticles in electrical tree propagation under DC voltage application

A Review on Nanocomposite Based Electrical Insulations

Application of Cold Plasma in Nanofillers Surface Modification for Enhancement of Insulation Characteristics of Polymer Nanocomposites: A Review

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