Dielectric Properties of Series Joined Silicone Rubber and Epoxy Resin Formulations (original) (raw)
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Studying dielectric losses of serially combined silicone rubber and epoxy resin
Tanzania Journal of Engineering and Technology, 2023
High voltage outdoor insulation systems are conventionally ceramics and glass with several advantages, such as proven in the field, excellent dielectric properties, durability, and long life. However, they are heavy, attract vandals and break easily, and they can lose their dielectric properties easily when subjected to high voltage transients, arcing, and surges. To curb this, polymer insulators are used because they have excellent dielectric properties, such as those of ceramics and glass, with the added advantages that they do not break easily and recover their lost dielectric properties after any electrical transients. Therefore, this paper investigates the dielectric properties of polymeric materials – silicone rubber (SR) and epoxy resin (ER). Some SR samples were manufactured in the laboratory, and others were obtained from the industrial manufacturer. All the ER samples were manufactured in the laboratory. The dielectric measurements were performed with the Insulation Diagnostics System. Within the measured frequency ranges, the dielectric losses of SR manufactured industrially differ from the laboratory-manufactured specimens. This is due to filler materials in the industrially manufactured samples. For the case of serially connecting the SR and ER, there was a higher influence of dielectric loss of SR than the ER, with some remarkable dielectric losses at some frequencies.
Dielectric Spectroscopy of Composites of Epoxy Resin
Journal of Basic & Applied Sciences, 2013
The dielectric behavior of composite of epoxies having different composition of prepolymer and epoxy equivalent is investigated in the frequency range 1E-1Hz to 1E5Hz at room temperature. The measurements presented consist of two sets of sample of epoxy resin with two different proportions 1:1 and 1:0.5 of resin and hardener. Samples having different proportion of resin and hardener shows low frequency dispersion (LFD) in the frequency range below 3 KHz at small thickness (less than 0.38mm). At large thickness the sample response is similar for the two different proportions.
Dielectric Properties of Filled Composites of Epoxy Resin
Journal of Basic & Applied Sciences, 2014
The addition of fillers in composite of epoxies, improves the dielectric response of the epoxies. The dielectric properties of unfilled and filled composites of epoxy resins have been studied as a function of thickness in the frequency range 10-1 Hz to 10 5 Hz at room temperature. The response of the unfilled samples shows that the composites behave as an insulator for all thickness. In filled composites at small thickness (0.32 mm) the response shows a loss peak in low frequency regime. The peak is broader than the Debye loss peak which is obscured by the dc conductance. At frequencies greater than p the response shows a well defined power law behaviour after the subtraction of C. Similar behaviour has been observed at different thickness.
2016
Currently, many operated the coal fired power plant to meet the energy needs of the world's electricity. But the coal fired power plant produces waste that can pollute the environment, such as fly ash and bottom ash, so requires management to not cause environmental problems, because coal fly ash classified as a hazardous waste. Fly ash has a particle size that is very smooth, and of some literature research done previously, fly ash coal containing silica (SiO2), alumina (Al2O3), titanium dioxide (TiO2), magnesium oxide (MgO) and zinc oxide (ZnO) are potentially as filler that are likely to be used as a mixture of silicone rubber and epoxy resin for electrical insulators. So this research theme was engineering insulation materials by utilizing waste coal fly ash. The purpose of this study was to obtain performance characteristics of waste coal fly ash as filler in silicon rubber and epoxy resin. To achieve these objectives, the activities that have been done is examined the effects of the use of fly ash as filler in silicone rubber material and epoxy resin. Parameters measured were dielectric strength and relative permittivity. The result of this research is the dielectric strength of silicone rubber rose with increasing quantity of fly ash. Conversely in epoxy resin, dielectric strength decreases with increasing quantity of fly ash. Furthermore, the measurement results relative permittivity, where the value of the relative permittivity of silicon rubber swell if it is filled with fly ash, as well as epoxy resin which has a value of permittivity relative to the concentration of fly ash filler material is linear.
Influence of absorbed moisture on the dielectric properties of epoxy resins
2010
The dielectric response of two bisphenol-A epoxy resin systems Araldite CY1301 (Tg ~ 50C) and Araldite CY1311 (Tg ~0C) was studied at different levels of relative humidity. The dielectric measurements were carried out over the frequency range 1 mHz to 100 kHz and the results were characterised in terms of conduction and relaxation processes. The characteristic parameters (frequency and magnitude) of all processes have found to be moisture dependent. The experimental data were fitted to a Dissado-Hill model and the form of the water dependence was characterized for all components of the dielectric response. The influence of possible interfacial features on the measured results is discussed.
The Curing Classifier of Dielectrics Based on Epoxy Resins
Conference Record of the 2006 IEEE International Symposium on Electrical Insulation, 2006
Monitoring of the properties and applicability of highvoltage insulating systems containing epoxy resins require knowledge of curing degree of these resins. This curing degree is considered to be the key parameter for quality of materials used for these systems. Application of Differential Thermal Analysis (DTA) for evaluation of curing degree of three-component composite materials (glass fabric, reconstructed mica, and epoxy resin) is presented in the article. Used analysis enables to observe characteristic structural parameter -the concentration of reaction-able particles in organic component of this material. In our investigation, concept of curing reactions courses was obtained as well as details for determination of optimal curing time of material. These conclusions have been verified with the other methods such as Thermomechanical Analysis (TMA) or loss factor and permitivity determination. Based upon these results it is obvious, that the conclusions correspond to one another.
Dielectric Properties of Industrial Polymer Composite Materials
2005
Frequency and temperature dependence of dielectric constant ε and dielectric loss ε in pure polyester resin and polymer composites with various types of glass fiber are studied in the frequency range 330 Hz-3 MHz and in the temperature range 25-150 • C. The experimental results show that ε and ε increased with the addition of glass fiber in polyester resin. The value of ε decreased with increasing frequency, which indicates that the major contribution to the polarization comes from orientation polarization. Dielectric loss peaks were also observed in the composite materials at high temperature due to Tg of polyester. The value of ε increased with increasing temperature, and is due to greater freedom of movement of the dipole molecular chains within the polyester at high temperature.
DIELECTRIC PROPERTIES OF CURED EPOXY WITH TETA
The dielectric properties of epoxy resin (diglycidylether of bisphenol A, DGEBA) with triethylene tetramine (TETA) were investigated by the complex impedance spectroscopy technique. The dielectric parameters have been measured using parallel plate capacitor method using HP 4192A LF Impedance Analyzer in the frequency range from 1 MHz to 13 MHz and in the temperature range from 25 C to 120C. Variations of real (e1) and imaginary (e2) parts of dielectric constants of material with frequency and temperature have been studied. The general behaviours of e1 and e2 are found to stable with increasing frequency up to 8 MHz. Over this frequency, an anomaly behaviours of e1 and e2 were reported except 25 C. e1 increase from about 9 MHz to approximately 10 MHz. e2 start to rapidly decrease about 8.5 MHz and they have been a deep about 9.7 MHz. e2 increases from about 9.7 MHz to 10 MHz. their behaviours are smooth above 10 MHz. When the Cole-Cole plots are investigated, e2 increase with e1 below 9 MHz and they are smooth with e1 above 10 MHz. But there are appeared rings between approximately 8 MHz-10 MHz.
Dielectric Properties of Laminating Resin
2018
Resin has been used in industries because of different essence. The main objective of the thesis was to develop a module to study the dielectric constant change during wetting and curing and to study if the wetting of the composite results in an apparent change in capacitance due to a partial or complete displacement of all cavities air by cavity resin. Three different sensors, big finger capacitor with photolithography, sprial and finger sensor were developed inorder to perfrom the research. The designing of the sensor was done with Eagle and Audacity was used to collect the data. Lamination were done with all sensors and results were analysed. For big finger capacitor, lamination was done on the top of it and lamina was first constructed and then the spiral and finger sensors were placed on top. The results analysed illustrates that at lower frequencies the resin molecules oscillates more as compared to the higher frequencies and oscillation stops as the resin gets cured. The demo...