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.
Continuous application of high voltages in an underground cable can cause slow deterioration of its insulation system. Electronic charges can be generated within the medium of the material and this can lead to permanent change of its dielectric properties to withstand high electrical stresses. The long-term degradation of underground cable insulation plays an important role in its eventual breakdown...
Insulation of an underground cable that has been in service for a very long time is subjected to various degrees of degradation. The degradation can lead to premature breakdown of its insulation, and the cost of replacing the cable can be very expensive. Thus there is a constant need from power utility companies' point of view to continuously monitor the condition of cable insulation in order to ensure...
Polymeric-insulated power cables are often subjected to multiple sources of degradation. Generally, the main cause for electrical breakdown in this type of cable insulation is usually due to the microscopic impurities and defects located in the bulk, or even at the interfaces of the material. When the dielectric is subjected to a high electrical stress, imperfections such as protrusions, contaminants...
When a solid-state material is subjected to a high electrical field stress, an emission of light known as electroluminescence (EL), will occur. This phenomenon has been used extensively to study charge injection and recombination mechanisms at the metal-polymer interface and as a probe to study early electrical ageing in insulating polymers. Most of the EL studies undertaken nowadays deal with measurements...
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.