ABSTRACT
In this study, it is the most important to develop the Spacer, a key component for the miniaturization and the compactification of the GIS, the power apparatus of HVAC & HVDC for the transformation of electric power. But, in fact, the Spacer compactification, as the insulation ma...
ABSTRACT
In this study, it is the most important to develop the Spacer, a key component for the miniaturization and the compactification of the GIS, the power apparatus of HVAC & HVDC for the transformation of electric power. But, in fact, the Spacer compactification, as the insulation material using the classical micro-alumina, is not very well expected to improve the electrical, mechanical, and thermal property. In this reason, the classical alumina is an essential material in order to improve the properties such as the mechanical property and the coefficient of thermal expansion.
To develop the insulation material being able to improve the electrical insulative performance, the thermal property, and the mechanical tensile strength, and to suppress the permittivity’ decline and the space charge, I tried to develop the composite with epoxy/nano alumina, by adding a little nano-alumina and reforming the surface of nano particle. For the sake of reforming the surface of nano particle, I reformed the surface in using Glycerol Diglycidyl Ether(GDE), and produced several samples including epoxy nano-micro alumina composite(epoxy-multi composite).
For the properties’ evaluations, I accomplished a study like the following. I measured the short-time dielectric breakdown, the treeing phenomenon, and the resistance of the partial discharge. And I evaluated the tensile and flexural strength as the mechanical properties. In checking out the each-measured property, I confirmed the alpha and gamma states’ crystals on the structural characteristic, as the result of the XRD diffraction experiment of micro-alumina and nano-alumina. In the case of resulted dispersion in using TEM. I realized that this was a good dispersion. In the thermal property, the glass transition temperature and the coefficient of expansion of the micro epoxy/micro alumina composite deccreased while the filled contents increased. But among the original-formed epoxy resin, the nano-alumina composite, and the multi-alumina composite, the glass transition temperature of the nano-alumina composite was the highest, and that of the multi-alumina composite was lower than the original-formed epoxy resin’s. The coefficient of expansion decreased while the filled contents of the epoxy micro-alumina composite increased. It also showed that of the micro-composite increased more than the multi-alumina composite’s. And, in the aspect of the mechanical property, it resulted that the tensile and flexural strength of the multi-alumina composite improved in the GDE3 more than the micro composite’s. In the aspect of the electrical property, in the case of the short-time dielectric breakdown’s strength, the epoxy micro-alumina composite appeared lower than the original-formed epoxy resin. But, in comparison with the mechanical property, the GDE1 of the epoxy multi-alumina composite showed the best insulative property, and it improved greatly in the 40wt%. In the treeing fracture characteristic, it showed that the nano-alumina composite with the surface treatment was suppressed more greatly in the treeing, being compared with the original form, and I confirmed that the GDE1 showed the more improved treeing-depression effect than the GDE3.
In the resistance of the partial discharge, I saw that the epoxy multi-alumina composite was damaged less than the micro-alumina composite in comparison with the epoxy micro composite. By doing so, the dispersion of the nano particle was brought about in the effect of the developed insulation material with the GDE’s nano particle surface treatment for the GIS Spacer’s application. In the long run, I obtained the result that the electrical, mechanical, and thermal properties of the multi-alumina improved much more.
ABSTRACT
In this study, it is the most important to develop the Spacer, a key component for the miniaturization and the compactification of the GIS, the power apparatus of HVAC & HVDC for the transformation of electric power. But, in fact, the Spacer compactification, as the insulation material using the classical micro-alumina, is not very well expected to improve the electrical, mechanical, and thermal property. In this reason, the classical alumina is an essential material in order to improve the properties such as the mechanical property and the coefficient of thermal expansion.
To develop the insulation material being able to improve the electrical insulative performance, the thermal property, and the mechanical tensile strength, and to suppress the permittivity’ decline and the space charge, I tried to develop the composite with epoxy/nano alumina, by adding a little nano-alumina and reforming the surface of nano particle. For the sake of reforming the surface of nano particle, I reformed the surface in using Glycerol Diglycidyl Ether(GDE), and produced several samples including epoxy nano-micro alumina composite(epoxy-multi composite).
For the properties’ evaluations, I accomplished a study like the following. I measured the short-time dielectric breakdown, the treeing phenomenon, and the resistance of the partial discharge. And I evaluated the tensile and flexural strength as the mechanical properties. In checking out the each-measured property, I confirmed the alpha and gamma states’ crystals on the structural characteristic, as the result of the XRD diffraction experiment of micro-alumina and nano-alumina. In the case of resulted dispersion in using TEM. I realized that this was a good dispersion. In the thermal property, the glass transition temperature and the coefficient of expansion of the micro epoxy/micro alumina composite deccreased while the filled contents increased. But among the original-formed epoxy resin, the nano-alumina composite, and the multi-alumina composite, the glass transition temperature of the nano-alumina composite was the highest, and that of the multi-alumina composite was lower than the original-formed epoxy resin’s. The coefficient of expansion decreased while the filled contents of the epoxy micro-alumina composite increased. It also showed that of the micro-composite increased more than the multi-alumina composite’s. And, in the aspect of the mechanical property, it resulted that the tensile and flexural strength of the multi-alumina composite improved in the GDE3 more than the micro composite’s. In the aspect of the electrical property, in the case of the short-time dielectric breakdown’s strength, the epoxy micro-alumina composite appeared lower than the original-formed epoxy resin. But, in comparison with the mechanical property, the GDE1 of the epoxy multi-alumina composite showed the best insulative property, and it improved greatly in the 40wt%. In the treeing fracture characteristic, it showed that the nano-alumina composite with the surface treatment was suppressed more greatly in the treeing, being compared with the original form, and I confirmed that the GDE1 showed the more improved treeing-depression effect than the GDE3.
In the resistance of the partial discharge, I saw that the epoxy multi-alumina composite was damaged less than the micro-alumina composite in comparison with the epoxy micro composite. By doing so, the dispersion of the nano particle was brought about in the effect of the developed insulation material with the GDE’s nano particle surface treatment for the GIS Spacer’s application. In the long run, I obtained the result that the electrical, mechanical, and thermal properties of the multi-alumina improved much more.
주제어
#에폭시
#멀티알루미나
#유리전이온도
#열팽창계수
#인장강도
#굴곡강도
#단시간 교류 절연파괴
#트리잉 파괴
#부분방전 저항성
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