Perpustakaan Digital ITB

The use of compact high voltage equipment has become a necessity, along with the high value of land for substations and the need for environmentally friendly insulation materials makes a solid insulation one of the best alternatives used as insulation for high voltage equipment. Solid insulation materials basically have a very high electric strength, and this strength is distinctly higher than the strength of liquids and gases. Solid insulation also has specific advantages: High breakdown strengths (e.g. for thin films), reduced stresses due to field displacement and their applicability as mechanical construction materials. It is well known that Epoxy Resin is the best insulation material in Solid Insulated Switchgear (SIS) due to its excellent mechanical, electrical properties and chemical stability. In this research, the authors compared four types of Epoxy resins, namely EP/C60, epoxy added with 100% C60 fullerene as filler (EP Type A); EP/NMST, epoxy added with 60% C60 fullerene, 20% C70 fullerene and 20% others high fullerene (EP Type B); EP/NPH, epoxy added with 40% C60 fullerene, 40% C70 fullerene and 20% others high fullerene (EP Type C) and Neat EP, epoxy without adding fullerene as a filler (EP Type D). EP/C60, EP/NMST and EP/NPH has same content of filler, that is 0.22 %wt. The dielectric strength and the dielectric spectroscopy measurement were performed to analyzed the influences of epoxy resin impurities with fulerene addition in its dielectric strength and dielectric properties of epoxy resin. The results of AC breakdown measurement show that dielectric strength electrical breakdown of EP/C60, EP/NMST, and EP/NPH increased by 33 %, 32 % and 30 %. The dielectric spectroscopy measurement show that the impurities of epoxy resin with fullerene increased the dielectric constant and decreased the dielectric loss factor of epoxy composites. Quantum Chemical Calculation (QCC) was also performed using GausView 5.9 software to analyze the electron energy state for explaining the improvement of electrical breakdown by adding different kinds of fullerene to epoxy resin. The QCC results show that the addition of fullerene to epoxy resin can increase the electronegativity of epoxy resin from 1.44 to 3.66 eV. The increase in electronegativity of epoxy resin is more likely to allow epoxy resins to capture free electrons, resulting in the increase in the dielectric strength. compared to that of Neat EP, respectively.