Space charge measurements on different epoxy resin-alumina nanocomposites

Magraner, Francisco; Garcı́a-Bernabé, Abel; Gil, Marcelo; Llovera, P.; Dodd, S.J.; Dissado, L.A.

doi:10.1109/icsd.2010.5568087

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…It was revealed that the reduction of the permittivity values strongly depends on filler type as well as filler size [ 33 , 34 , 35 ]. On the other hand, the presence of nanofillers in epoxy resin affects the space charge accumulation in polymer matrix [ 26 , 36 , 37 , 38 ]. The accumulation of space charge has a huge influence on dielectric properties of insulation systems.…”

Section: Nanocomposite Used In High-voltage Applicationsmentioning

confidence: 99%

Properties of Polymer Composites Used in High-Voltage Applications

et al. 2016

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Abstract:The present review article represents a comprehensive study on polymer micro/nanocomposites that are used in high-voltage applications. Particular focus is on the structure-property relationship of composite materials used in power engineering, by exploiting fundamental theory as well as numerical/analytical models and the influence of material design on electrical, mechanical and thermal properties. In addition to describing the scientific development of micro/nanocomposites electrical features desired in power engineering, the study is mainly focused on the electrical properties of insulating materials, particularly cross-linked polyethylene (XLPE) and epoxy resins, unfilled and filled with different types of filler. Polymer micro/nanocomposites based on XLPE and epoxy resins are usually used as insulating systems for high-voltage applications, such as: cables, generators, motors, cast resin dry-type transformers, etc. Furthermore, this paper includes ample discussions regarding the advantages and disadvantages resulting in the electrical, mechanical and thermal properties by the addition of micro-and nanofillers into the base polymer. The study goals are to determine the impact of filler size, type and distribution of the particles into the polymer matrix on the electrical, mechanical and thermal properties of the polymer micro/nanocomposites compared to the neat polymer and traditionally materials used as insulation systems in high-voltage engineering. Properties such as electrical conductivity, relative permittivity, dielectric losses, partial discharges, erosion resistance, space charge behavior, electric breakdown, tracking and electrical tree resistance, thermal conductivity, tensile strength and modulus, elongation at break of micro-and nanocomposites based on epoxy resin and XLPE are analyzed. Finally, it was concluded that the use of polymer micro/nanocomposites in electrical engineering is very promising and further research work must be accomplished in order to diversify the polymer composites matrices and to improve their properties.

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Section: Nanocomposite Used In High-voltage Applicationsmentioning

confidence: 99%

Properties of Polymer Composites Used in High-Voltage Applications

et al. 2016

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“…Although it is also possible for homopolar space charge to be formed if positive/negative ions are extracted into the cathode/anode electrodes while homopolar ions remain, transport of ions into electrodes is much more difficult compared to electronic charge injection since mass transfer is involved in ion extraction. Another supporting fact is that steady heteropolar ionic charges can easily accumulate around the electrodes in many polymer dielectrics, since this cannot happen if ions can be effectively extracted into the electrodes [50][51]. Besides impurities in LDPE matrix, nanofillers can also introduce ionizable impurities, whose effect become more significant with increasing filler contents and aggregation of fillers.…”

Section: The Correlation Between Chargingmentioning

confidence: 99%

Stepwise electric field induced charging current and its correlation with space charge formation in LDPE/ZnO nanocomposite

Tian

Yao

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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This study intends to establish the correlation between charging current under stepwise increased electric field and space charge formation in low density polyethylene (LDPE) and LDPE/ZnO nanocomposites. By applying stepwise increased electric field, the charging current and space charge distribution were measured as a function of time under 10, 30 and 50 kV/mm, respectively. The results show that homopolar space charge formation induces increasing charging current with time, while heteropolar space charge formation induces decaying charging current and excellent space charge suppression is accompanied by constant charging current with time. The abundant deep trapping states introduced by nanofillers dominate both the lower steady charging current and space charge suppression in the nanocomposite. The results indicate that charging current behavior induced by stepwise increased electric field is extremely informative and is feasible to be a direct method for rough estimation of space charge formation and suppression in polymer dielectrics. Addition of ZnO nanofillers suppresses space charge accumulation in LDPE, indicating LDPE/ZnO nanocomposite is a potential insulation material for high voltage direction current cables.Index Termsstepwise increased electric field, charging current, space charge, nanodielectrics, LDPE/ZnO.

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Understanding the impact of gamma irradiation on electrical and mechanical properties of epoxy nanocomposites

Karpagam

Sarathi

Tanaka

2011

J of Applied Polymer Sci

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In this work, the influences of gamma irradiation on the electrical and mechanical properties of the epoxy nanocomposites were studied. The exfoliation characteristics of epoxy nanocomposite material analyzed through TEM studies. It is shown that the impact and flexural strength of the material is high with epoxy nanocomposites and gets reduced with the gamma‐irradiated specimen. The AC breakdown strength of the epoxy nanocomposites is high compared with the base epoxy resin. It is also observed that a reduction in permittivity and tan(δ) of epoxy resin added with 1 wt % of nanoclay. Increase in percentage of clay shows increase in permittivity and tan(δ). Gamma irradiation of epoxy nanocomposite material shows increase in permittivity. The volume resistivity of the material is high with epoxy nanocomposite and is less with gamma‐irradiated specimen compared with virgin specimen. The impact strength and flexural strength indicates correlation with breakdown strength of the material. It is observed that the increase in applied voltage shows an increase in magnitude of the charge density in the insulation structure. With the gamma‐irradiated specimen, the charge density (for the applied electric field) is less compared with the virgin specimen. Electric field analysis indicates that the electric field is uniform in the bulk volume of the epoxy nanocomposite material. The rate of charge decay is high with gamma‐irradiated specimen compared with virgin specimen. It is realized that material with lower resistivity has faster decay of stored charge. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Space charge measurements on different epoxy resin-alumina nanocomposites

Cited by 9 publications

References 7 publications

Properties of Polymer Composites Used in High-Voltage Applications

Properties of Polymer Composites Used in High-Voltage Applications

Stepwise electric field induced charging current and its correlation with space charge formation in LDPE/ZnO nanocomposite

Understanding the impact of gamma irradiation on electrical and mechanical properties of epoxy nanocomposites

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