Materials Literature
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Doping high thermal conductivity fillers into polymers as a major way to improve the thermal conductivity of materials, but the failure mechanism of the coupling agents and entangled polymer chains on the thermal conductivity of nanofillers is missing. In order to explore those, the thermal conductivity of pure BN nan…
Insulators of the spacer have been studied to relax the electric field in order to downsize gas insulated switchgears (GISs). We have been researching to make electric field relaxation of solid insulation material by filling with ZnO varistor granules. In our previous study, when we applied positive lightning impulse…
Indoor electrical devices like smoothing reactor in Ultra High Voltage Direct Current (UHVDC) converter station demand certain performance in discharge characteristic, which is of vital importance in the valve hall and indoor Direct Current (DC) field. Concerning the complexity of structure in the valve hall and DC fi…
The Partial Discharge phenomenon represents one of the major causes of the deterioration and ageing of the insulating systems of electric machines and, consequently, leads to a considerable shortening of their lifetime. Although the theory and practice focus more on partial discharges caused by a sinusoidal power supp…
Nickel oxide (NiO) nanoparticles were produced by wire explosion process (WEP) in Oxygen ambience. XRD studies have confirmed the formation of NiO during WEP under oxygen rich environment and with high energy ratios. Crystallite size of synthesized NiO nanoparticles was found to be 26.7 nm. The particles produced are…
Energetic electrons from the space can penetrate through the aluminum shield of spacecraft and deposit in the deep layer of insulating materials, leading to internal charging. When the space charge accumulation exceeds a certain threshold, Electric field distortion occurs, resulting in the failure of electronic equipm…
Salah satu jenis penambat elastis adalah penambat elastis tipe e-clip. Penggunaan penambat elastis e-clip sendiri mendapatkan pengesahan dan rekomendasi pemakaian dari Direktur Jenderal Perkeretaapian Kementrian Perhubungan No. KA.405/SK.10/DJKA/II/10. Salah cara untuk menaikan batas elastik baja dengan cara perlakuan…
In our previous studies, we confirmed that the breakdown voltage did not decrease significantly even if nitrogen (N2) fine bubbles were added to pure water. In addition, we confirmed that the conductivity of pure water increased when we used a metallic fine bubble generator. In this study, we investigated an influence…
Nano-coatings, which are generally composed of inorganic nanofillers and polymer binders, have attracted increasing interest in electrical industry, because of their unique advantages for improving the dielectric and electrical properties of the electric devices, accompanied by the versatile manufacturing process. Her…
In experiment, it was found that the electrons injected into fluorinated polyethylene (PE) were much less than pure PE. In order to clarify the microscopic mechanism of this phenomenon, the PE/fluorinated layer structure is constructed with the help of molecular dynamics. The constructed model's density is in correspo…
The contact form between the electrode and the insulator is an important factor affecting flashover. In this paper, the surface flashover characteristics of insulators in three different contact forms were studied in C4F7N/CO2mixtures, which is a new environmental-friendly gas. And through the calculation and analysis…
Hydrophobicity and flashover strength are important properties of outdoor insulators, especially in the tropic region, which have high pollution and high intensity of rainfall. This study examines the impact coal fly ash as a micro filler on static hydrophobicity and DC dry flashover strength of the silicon rubber. Th…
In this paper, from the perspective of the change of energy level distribution in the polymer after filled with nanoparticles, a method for the evaluation of energy level distribution in nanocomposite was deeply investigated by analyzing the polarization current. And the feasibility of the method was verified by the c…
The soft epoxy resin (SE) and the hard epoxy resin (HE) used in the nuclear power plants were simultaneously given heat and radiation. The glass transition temperature (Tg), indenter modulus (IM), and complex permittivity were measured. The difference in Tg between SE and HE is very significant, which exerts a great d…
This paper discusses gas production of monoesters under low thermal stresses and evaluation of fault interpretation methods to the oils. Two kinds of monoesters, namely the monoester having C=C bond and that without C=C were heated locally at the temperatures of 200, 250 and 300 °C. Three kind of fault interpretation…
In polymeric insulations space charges tend to form under DC voltage stress. Consequently, at a polarity reversal of the voltage, the electric field is intensified locally, which accelerates the aging of the insulation and can lead to the destruction of the insulating material in the worst case. The aim of this work i…
Metal - Insulator - Metal (MIM) and Metal - Insulator- Semiconductor (MIS) capacitors were fabricated by spin coating poly (methyl methacrylate) (PMMA) as the insulating material. Here, we consider the effect of dissimilar contact electrodes systems (Cu/Pt and Cu/n-Si) on the dielectric and electrical response. From t…
The electrical insulation in mass-impregnated high voltage direct current (HVDC) cables consists of many layers of paper tapes that are wound helically around the conductor and subsequently impregnated in oil. The oil fills the interstices between the fibers in the paper, as well as the larger gaps ("butt gaps") betwe…
The quantitative evaluation of the cable life has always been a technical problem. An equivalent thermal circuit model of multi-loop trench laying cables is proposed for the fast calculation of the conductor temperature rise. The thermal coupling between multiple loops of the cables is characterized by the mutual ther…
Al2O3nanoparticles were treated by plasma and silane coupling agent. Polyimide nano (PI/Al2O3) composite films were prepared by in-situ polymerization. The microstructure of PI/Al2O3films was observed by scanning electron microscopy and Fourier transform infrared spectroscopy. The structure and functional groups were…