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.
High speed photography has been used for many decades in the study of gas breakdown but only recently has the technology become adequate to permit similar work with solids. Using a simple camera we previously investigated1 the impulse wavefront breakdown of a composite consisting of a column of air in series with a layer of polymethyl methacrylate (PMMA). The hypothesis in vogue2 is that such insulation...
It is currently believed that the extension of an electrical “tree” in solid insulation depends on the establishment of a plasma within an existing tubule. Thus, voltage is conveyed from the electrode to regions deep in the solid, which breakdown locally where the stress concentration is such that the intrinsic strength is exceeded. Evidently the electric strength of the gas in the tubules is an important...
There have been many reports in recent years of the premature failure of extruded polyethylene insulated cables. In seeking reasons for this it has become apparent that polyethylene under electrical stress will absorb water when in contact with it. Many accounts have been given of the deleterious effect of water on the electrical properties of the insulation, but little has been established about...
It is frequently assumed that composite insulation, consisting for example, of a column of air in series with a solid dielectric, breaks down because a discharge in the weaker gaseous section acts like a thin conducting extension of the electrode. The applied voltage is conveyed by the discharge channel to the stronger medium, which breaks down provided the stress concentration is such that the intrinsic...
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.