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.
Pre-breakdown light emission, current and photo current are measured, simultaneously. For a negative needle point, figures of light emission are divided into two patterns. They change from a bush-type to a tree-type as the applied voltage and the oil surface pressure increases. In the case of the tree-type, they are caused by streamer only at the initial stage. In the case of the bush-type, the lights...
The results presented here refer to a tungsten point anode and stainless steel plane cathode. Figure 1 relates maximum positive streamer growth to pulse duration and pulse amplitude in nhexane. The figure shows a scatter in experimental points on the graph typical of such a set of curves. A smooth curve is drawn through each set of points, by eye, to approximate a best fit curve with a degree of uncertainty...
Using Kerr effect charge injection from point cathode and anode in nitrobenzene in prebreakdown electric field under pulse voltage of microsecond range has been recorded. Cathode emission started at Ei=0.5MV/cm and anode - at Ei=1.0MV/cm. Negative space charge was approximately uniformly distributed around the point cathode top, and anode positive charges injection was of local nature. Prebreakdown...
Polarity and conditioning effects of breakdown in liquid helium and the influence of electrode coating by solid insulator are studied. The breakdown strength under positive needle condition, decreases with repeating breakdown events. However, it increases under negative needle condition, which can be explained in terms of severe damage of cathode surface and it influence on electron emission from...
A study was made of the time-lag characteristics of a trigatron spark gap in a several liquid hydrocarbons for both anode and cathode triggering. The influence of the main gap voltage and of the gap length was investigated. The significance of the results obtained is discussed.
The prebreakdown processes have been recorded in n-hexane, toluene, and Marcol 70, both in a pure state and with selected impurities. The study was carried out using a point-plane geometry. A low ionization potential additive had only a small effect on the breakdown voltage or the streamer propagation speed but did significantly alter the shape of the prebreakdown streamer when the needle was the...
The various mechanisms proposed to explain the conductivity of organic dielectric liquids at high fields (50 to 2000 kV/cm) are considered and their range of validity assessed.
The breakdown voltage versus gap length characteristics were obtained for degassed silicone oil, oil saturated with oxygen and oil containing varying concentrations of 1-methylnaphthalene as additive. Both aluminium and stainless steel electrodes were used. The breakdown voltage - gap characteristics for various additive concentrations in degassed oil all pass through a critical gap length at which...
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.