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.
The DC conduction of transformer oil and transformer oil-based nanofluids were investigated with increasing electric field strength in this paper. The results show that entire process of conduction can be divided into three stages, including resistance stage, tunneling stage and space-charge limited stage. Further analysis indicate that the generation and movement mechanism of carriers are different...
In order to explore the relationship between microstructure and macroscopic performance of transformer oil-based nanofluids, the transformer oil modified by silicon dioxide nanoparticles were prepared whose stability and moisture content were measured. Then the dielectric spectroscopy of the pure oil and transformer oil-based nanofluids were measured and the influence of nanoparticle concentration...
The transformer oil-based nanofluids have significant improvements in their thermal conductivity and dielectric strength than traditional transformer oil, so they have a wide prospect of application. In order to explore the mechanism of the thermal dissipation enhancement of transformer oil-based nanofluids, the flow field distribution of them under the DC voltage were measured by particle image velocimetry...
Transformer oil-based nanofluids have gained wide recognition for its higher dielectric strength compared with pure oil. But few researches focus on its thermal capability. In this paper, computational models working on different kinds of nanoclusters in transformer oil fluidic system have been developed at an atomic-molecular level to explore the temperature impact on the systems' viscosity. SiO2...
Oil-paper insulation is widely used in power transformers. Thus, its insulation quality, aging included, has a strong impact on the operation of power transformer. The purpose of this paper is to evaluate oil-paper insulation's aging condition more reliably. The frequency domain spectroscopy of several oil-immersed paper samples with different aging conditions were measured at 25°, 60°, 90° and 120°...
Nowadays, global energy system and environment are facing enormous challenges. In the context of energy internet, transport fleet is transitioning to electric, plug-in and fuel cell vehicles and energy utilization are greener. The electric vehicles and renewable energy synergies in smart grid are of great significance for ensuring energy security, preventing air pollution and promoting energy saving...
The dispersion stability of nano-modified transformer oil with the greater thermal conductivity and dielectric strength is a difficulty to be investigated. In order to have a deep understanding of the stable mechanism of nano-modified transformer oil, the total interaction energy was calculated by the molecular dynamic (MD) simulation based on the DLVO theory. A COMPASS force field was employed, and...
This paper studies on the method for the fault diagnosis of switching power supply. The method is based on the diagnosis principle of the sensitivity sequence of node-voltage and refers to the fault dictionary method which is mostly applied to the artificial circuit without tolerance and the linear circuits. In this paper, it is extended for the nonlinear circuit of switching power supply with tolerance...
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.