Journal ArticleDOI
Nonlinear dielectric composites
TLDR
In this paper, the influence of nonlinear properties of filler material on the resulting dielectric properties has been studied both theoretically and experimentally, using effective medium theory to show how much of the nonlinearity of the filler is transferred to the composite.Abstract:
Polymer composites with high dielectric constant are widely used as shielding and field grading materials. An improvement of the refractive grading can be expected for a dielectric constant being a nonlinear function of the electric field or the temperature, as known for nonlinear resistive field grading. An increase of the dielectric constant in those areas where the highest electrical field occur will result in a homogenization of the field distribution. Such composite materials can be considered as having the smart functions of sensing and actuating. The influence of nonlinear properties of filler material on the resulting dielectric properties has been studied both theoretically and experimentally. Calculations using effective medium theory show how much of the nonlinearity of the filler is transferred to the composite. They are compared with experiments on composites containing ferroelectric, semiconducting and varistor-type filler material in a thermoset or thermoplastic matrix. Depending on the filler type, the dielectric constant increases by a factor of up to three, for example, on raising the temperature from 30 degrees C to 150 degrees C. Such an enhancement can be sufficient to rearrange the field distribution in stressed insulating parts.read more
Citations
More filters
Journal ArticleDOI
High-k polymer nanocomposites with 1D filler for dielectric and energy storage applications
TL;DR: In this article, the authors summarized the latest research on one-dimensional and quasi-1D fillers based high-k polymer nanocomposites with the focus on the superiority of 1D or quasi-one-dimensional highk fillers in enhancing the dielectric properties and energy storage capability of polymer composites.
Journal ArticleDOI
Partial discharge control in a power electronic module using high permittivity non-linear dielectrics
TL;DR: In this paper, the use of silicone gels filled with barium titanate to reduce the electric field enhancement at the edge of substrate metallization and therefore increase partial discharge inception voltages was examined.
Journal ArticleDOI
Polymer composite thermistors for temperature and current sensors
TL;DR: In this paper, the electrical resistivity of polymer composites is studied as a function of temperature and the choice of polymer and its processing determine the transition temperature from a conducting state to an insulating state.
Journal ArticleDOI
Improving electret properties of PP filaments with barium titanate
TL;DR: Barium titanate (BaTiO 3 ) containing polypropylene (PP) composite filaments were melt spun to modify polymer electrostatic charging characteristics as discussed by the authors, and their surface potentials were measured.
Journal ArticleDOI
One-dimensional model for nonlinear stress control in cable terminations
Jakob Rhyner,M.G. Bou-Diab +1 more
TL;DR: In this article, a one-dimensional model for field control in cable terminations is analyzed mathematically both for linear and nonlinear field grading materials, and the results show that conclusions for non-linear field control based on linear calculations in general are misleading.
References
More filters
Journal ArticleDOI
A New Equation for Predicting the Dielectric Constant of a Mixture
TL;DR: In this article, the dielectric constant of a compound consisting of two different materials was simulated using the Monte Carlo and finite element methods, and a new equation to predict the predicted value of the compound was derived, which was better than in any other case reported before.
Journal ArticleDOI
Equations for the conductivity of macroscopic mixtures
TL;DR: In this paper, the conductivity of a wide variety of binary macroscopic conducting mixtures as a function of the conductivities of the components, the volume fraction of each, the space dimension and a single parameter are presented.
Journal ArticleDOI
Electromechanical properties of smart materials
TL;DR: A smart material is one that can perform both sensor and actuator functions as mentioned in this paper, which allows for some flexibility in deciding how to qualify a material as "smart", since the fun damental mechanisms of operation may differ greatly between types of smart materials.
Journal ArticleDOI
Ultraviolet to far infrared optical properties of the one-dimensional conductor K2Pt(CN)4Br0·3. 3H2O
TL;DR: In this paper, an experimental study of the optical properties of single crystals of the quasi-one-dimensional conductor K2Pt(CN)4Br0·3, 3H2O in the spectral range from 45,000 to 10 cm−1 is presented.
Journal ArticleDOI
High Dielectric Constant Materials For Primary Voltage Cable Terminations
P. N. Nelson,H. C. Hervig +1 more
TL;DR: In this paper, a non-geometric high dielectric constant stress relef has been used successfully since the 1960' s for terminating shielded power cable primarily in tape form, and the resultant work provides an economical elastomer for terminating primary voltage cable, and effective distribution of the electrical field along the termination surface.
Related Papers (5)
Development of epoxy-aluminum nanocomposite dielectric material with low filler concentration for embedded capacitor applications
Siny Paul,T. K. Sindhu +1 more
Effect of resistivity ratio on energy storage and dielectric relaxation properties of 0-3 dielectric composites
Hongbo Liu,Brahim Dkhil +1 more
A review on electrical properties of fiber reinforced polymer composites
Deepak Pathania,Devender Singh +1 more