The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Under high DC voltage, the space charge accumulation can largely alters the local field distribution in epoxy resin. And it has been revealed that nanoparticles have great influences on space charge distribution in epoxy resin. To reveal the mechanism of nanoparticles, the effects of nanoparticles on trap depth are investigated under different temperature. In this work, epoxy resin and its nano composite...
Under high DC voltages, the space charge distribution can greatly distort the electric field and may cause premature failure of the insulation material. The development of space charge in the material is affected by several factors like electrical field, temperature and electrode materials. In this work, the pulsed electroacoustic (PEA) technique was used to measure the space charge distribution in...
Comparing to the base epoxy resin, nano-composites usually have enhanced mechanical, thermal and electrical properties, and a lot of technology was introduced to get high quality nano-composites. In this work, Ag nanoparticles have been synthesized by using ethanol (and DMF) as reducing agent and solvent in the presence of ultraviolet radiation and polyvinyl pyrrolidone. The particle size can be controlled...
Surface flashover in vacuum is a primary limitation to pulsed-power devices. Recently, there are more studies on the pulsed vacuum surface flashover focused on the flashover mechanism. In this paper, the UV illumination is used to study the mechanism of vacuum surface flashover. The effects of different illumination positions, different illumination durations and different illumination intensities...
Micro TiO2 and Al2O3·3H2O fillers were loaded into the epoxy resin by mixing different weight ratio. The flashover studies were conducted using 20 ns (rise time)/1.5 μm (half-height width time) pulse under 5 × 10-3Pa vacuum. The surface flashover properties of micro TiO2 and Al2O3·3H2O/epoxy composites were presented. In addition, their dielectric spectrum and thermally stimulated depolarization current...
This paper mainly studies the influence of nano/micro Al2O3 and Al(OH)3 in epoxy composites on the ablation resistance, by quantifying the mass loss and observing the surface topography of sample after several times surface flashover in vacuum (the peak value is approximately 10kA, and the wave front is 8us, wave tail is 20us(8/20us)). The experimental results show that the addition of inorganic filler...
Micro TiO2/epoxy composite samples with different filler weight percentage were prepared. Their flashover voltages under the 50ns (rise time)/2.5μm (half-height width time) pulse in transformer oil were measured. The results of surface flashover voltages as the number of flashovers, weight percentage of the filler, fluid pressure and the steepness of the pulse were presented. It is demonstrated that...
The vacuum surface flashover characteristic of solid material under steep pulse severely restricts the structure and performance of pulsed-power devices; and with excellent performance in insulation and mechanical strength, epoxy resin has been widely employed in pulse equipment; moreover, the accumulation of surface charge not only enhances the electric field but also affects the movement of the...
Micro and nano Al2O3middot3H2O fillers are loaded into the epoxy resin by mixing different weight ratio. The flashover studies were conducted using three kinds of nanosecond rise pulse under 5 times 10-3 Pa vacuum. The surface flashover properties of nano and micro Al2O3middot3H2O/epoxy composites are presented. The influence of filler size and content on the interface structure, interface layer distribution...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.