Electric conduit assembly for transmitting electric power at UHV and EHV levels

摘要

An electric conduit assembly using air as the insulative medium is capable of transmitting electric power at UHV and EHV levels. The conduit assembly comprises a conduit housing having a cylindrical conductor concentrically disposed therein with a cylindrical metal shield interposed between the conductor and conduit housing. The entire space within the conduit housing is filled with air under normal atmosphere conditions. A series of discrete lumped impedances, preferably lumped capacitances, are contained within the metal shield and electrically connect the shield to the conductor at spaced intervals along their lengths. The lumped impedances effectively reduce the electric field gradient thereby increasing the insulating withstand capability to such an extent that air under normal atmosphere conditions can be used as the insulative medium.