Nano- and micro-filler combination enabling practical use of nanocomposite insulating materials

Imai, T.; Komiya, Gen; Murayama, Kiyoko; Ozaki, T.; Sawa, Fumio; Shimizu, Toshio; Harada, Miyuki; Ochi, Mitsukazu; Ohki, Yoshimichi; Tanaka, Toshikatsu

doi:10.1109/iseim.2008.4664556

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…The important parameters considered for selecting the dielectric materials were Dielectric strength, Conductivity, Dielectric constant, Loss factor, Flash point, Gas content, Viscosity, Mechanical strength, Compressive strength, Bonding strength, Surface resistance, Tracking resistance and Chemical properties. Organic varnishes and solvent less resin were widely used in the Insulation system of electrical machines for impregnation and finishing applications [1][2][3]. Impregnating and finishing agents offer several advantages, such as increased mechanical bonding to the winding wire, improved dielectric properties, improved thermal conductivity and protection to the winding against moisture and chemically corrosive environment.…”

Section: Introductionmentioning

confidence: 99%

“…The dielectric property depends upon the atomic structure of the material. For crystals, the dielectric constant depends on the direction along materials [3][4][5]. The passage of electrons through insulators by jumping from one energy level to another in the forbidden band due to the presence of impurities or structural defects was called as Hopping effect.…”

Section: Introductionmentioning

confidence: 99%

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Electrical and Thermal Characterization of Organic Varnish Filled with ZrO₂Nano Filler Used in Electrical Machines

Selvaraj¹,

Vijayaraj²,

Sugumaran³

2015

Journal of Electrical Engineering and Technology

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-In the last decade it has been witnessed significant developments in the area of nano particles and nano scale fillers on electrical, thermal, and mechanical properties of polymeric materials such as resins, varnishes, enamel and bakelites. The electric and thermal properties were more important in the electrical equipments for both steady state and transient state conditions. This paper deals with the characterization of the electric and thermal properties of the pure varnish and zirconia (ZrO 2 ) filler mixed varnish. The electric properties such as dielectric loss (tan δ), dielectric constant (ε), dielectric strength and partial discharge voltage were analyzed and detailed for different samples. It was observed that zirconia nano filler mixed varnish has the superior dielectric and thermal properties when compared to those of standard varnish. It has shown that at power frequency the 1wt% nano composite sample has the higher permittivity value when compared to other samples. It has been examined that the 1wt% sample was having higher inception and extinction voltages when compared to other samples. It has been observed that 1wt% sample has higher dielectric strength when compared with other samples. There has been an improvement of thermal property by adding few weight percent of zirconia nano fillers. There was not much variation in glass transition among the nano mixed composites. The weight loss was improved at 1wt% of the zirconia nano fillers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrical and Thermal Characterization of Organic Varnish Filled with ZrO₂Nano Filler Used in Electrical Machines

Selvaraj¹,

Vijayaraj²,

Sugumaran³

2015

Journal of Electrical Engineering and Technology

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“…Since it is the ratio of the same quantity it has no unit. It is used as a measure of the polarization in the dielectric material [3]. Polarization is defined as the process of producing diploes in the dielectric materials by an external electric field.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Dielectric Properties of Polyamide Enamel Insulation in High Voltage Apparatuses Used in Medical Electronics by Adding Nano Composites of SiO₂and Al₂O₃Fillers

Biju¹,

Victoire²,

Selvaraj³

2015

Journal of Electrical Engineering and Technology

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-In recent days, there was a significant development on the electrical, thermal, mechanical, physical, chemical, magnetic and optical properties of the polyamide enamel, varnish and other insulating materials by the addition of nano fillers to it. Enamel was used in High Voltage Apparatuses used in Medical Electronics as insulation. Insulating materials determine the life time of the electrical apparatuses. The life time of the insulating materials was improved by the addition of nano fillers to it. Hence the life time of the electrical apparatuses was improved by the mixing of nano fillers to the enamel. In this research, the basic dielectric properties of the enamel and enamel mixed with nano composites of silica and alumina were analyzed and compared with each other. The addition of nano fillers has improved the quality factor and capacitance of the enamel. It was also observed that the addition of nano fillers has reduced the dissipation factor and dielectric losses of the enamel. Heat produced by the dielectric losses was also reduced by adding nano fillers to it.

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“…2 Despite the basic understanding of electrical breakdown (BD) of materials, electrical surface°ashover phenomena, physical mechanisms responsible for the initiation of such unwanted electrical activities within an insulation system composed of such advanced materials must be investigated before they can be commercially available. 3,8,9 The¯ndings of such studies were essential for the development of nanoelectric and other advanced materials and the techniques to predict the reliability of the advanced electrical systems utilize these materials. 6 The nanostructured polymeric materials are object of great interest by the researchers.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Dielectric and Thermal Properties of Polyamide Enamel Filled With Carbon Nanotubes

Selvaraj¹,

Sugumaran

Ganesan³

et al. 2013

Int. J. Nanosci.

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In recent days, there was a signi¯cant development in the area of nanoparticles and nanoscalē llers on dielectric, thermal and mechanical properties of polymeric materials. The dielectric and thermal properties of standard polyamide and nanoscale-¯lled samples were detailed and analyzed. Carbon nanotubes were used as nano¯llers. Carbon nanotubes were synthesized by chemical vapor deposition (CVD). The basic properties such as dielectric loss tangent (tan ), dielectric constant ("), dielectric strength, partial discharge inception voltage, surface resistivity, quality factor, phase angle, dielectric conductivity, dielectric power loss and thermal withstand strength of the polyamide enamel¯lled with carbon nanotubes were analyzed and compared with the properties of the standard enamel. The experimental results show that carbon nanotubes mixed with polyamide enamel had better thermal properties when compared to that of standard enamel.

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Nano- and micro-filler combination enabling practical use of nanocomposite insulating materials

Cited by 7 publications

References 4 publications

Electrical and Thermal Characterization of Organic Varnish Filled with ZrO₂Nano Filler Used in Electrical Machines

Electrical and Thermal Characterization of Organic Varnish Filled with ZrO₂Nano Filler Used in Electrical Machines

Enhancement of Dielectric Properties of Polyamide Enamel Insulation in High Voltage Apparatuses Used in Medical Electronics by Adding Nano Composites of SiO₂and Al₂O₃Fillers

Analysis of Dielectric and Thermal Properties of Polyamide Enamel Filled With Carbon Nanotubes

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Nano- and micro-filler combination enabling practical use of nanocomposite insulating materials

Cited by 7 publications

References 4 publications

Electrical and Thermal Characterization of Organic Varnish Filled with ZrO2Nano Filler Used in Electrical Machines

Electrical and Thermal Characterization of Organic Varnish Filled with ZrO2Nano Filler Used in Electrical Machines

Enhancement of Dielectric Properties of Polyamide Enamel Insulation in High Voltage Apparatuses Used in Medical Electronics by Adding Nano Composites of SiO2and Al2O3Fillers

Analysis of Dielectric and Thermal Properties of Polyamide Enamel Filled With Carbon Nanotubes

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Electrical and Thermal Characterization of Organic Varnish Filled with ZrO₂Nano Filler Used in Electrical Machines

Electrical and Thermal Characterization of Organic Varnish Filled with ZrO₂Nano Filler Used in Electrical Machines

Enhancement of Dielectric Properties of Polyamide Enamel Insulation in High Voltage Apparatuses Used in Medical Electronics by Adding Nano Composites of SiO₂and Al₂O₃Fillers