Dead tank housing for high voltage circuit breaker employing puffer interrupters

A dead tank high voltage circuit breaker comprising, in combination:

• a gas-filled cylindrical elongated metal housing having an exterior support framework;
• first, second and third elongated interrupter structures disposed parallel to one another and having respective central axes which are equally spaced from one another;
• three pairs of insulator bushings;
• each of said three pairs connected to the opposite ends of respective ones of said first, second and third interrupter structures;
• each of said pairs of bushings extending outwardly of said metal housing to provide exterior connection points for each of said interrupter structures;
• an operating mechanism disposed exteriorly of said elongated metal housing and having operating shaft means connected to each of said interrupter structures for simultaneously operating each of said interrupter structures;
• said gas-filled metal housing being filled with sulfur hexafluoride under positive pressure;
• and an elongated tray filled with filter drier material for absorbing moisture from said gas disposed on the bottom of said cylindrical metal housing and being disposed generally parallel to said axes of said interrupter structures;
• the axes of said first and second interrupter structures lying in a horizontal plane which is below said axis of said third interrupter structure whereby said tray has the greatest possible lateral spacing from any one of said interrupter structures.

A dead tank high voltage circuit breaker comprising, in combination:

• a gas-filled cylindrical elongated metal housing having an exterior support framework;
• first, second and third elongated interrupter structures disposed parallel to one another and having respective central axes which are equally spaced from one another;
• three pairs of insulator bushings, each of said three pairs connected to the opposite ends of respective ones of said first, second and third interrupter structures;
• each of said pairs of bushings extending outwardly of said metal housing to provide exterior connection points for each of said interrupter structures;
• an operating mechanism disposed exteriorly of said elongated metal housing and having operating shaft means connected to each of said interrupter structures for simultaneously operating each of said interrupter structures;
• said cylindrical metal housing having a plurality of generally circular openings therein;
• each of said openings having relatively sharp peripheral edges which would create high dielectric stress in the gas adjacent said edge in the presence of a high electric field;
• each of said insulator bushings being fixed to said metal housing at a respective one of said openings and having a bushing conductor which extends through said respective opening;
• and respective corona shield means for the edges of said openings;
• each of said corona shield means comprising a hollow flexible metal corrugated tube;
• each of said tubes having a length equal to the periphery of their respective opening, and being bent to the shape of their respective opening;
• each of said tubes having a slot in their outer periphery;
• said peripheral edge of each of said openings being received in the said slot of their respective flexible tubular corona shields.

A dead tank high voltage circuit breaker comprising, in combination:

• a gas-filled cylindrical elongated metal housing having an exterior support framework;
• first, second and third elongated interrupter structures disposed parallel to one another and having respective central axes which are equally spaced from one another;
• three pairs of insulator bushings, each of said three pairs connected to the opposite ends of respective ones of said first, second and third interrupter structures;
• each of said pairs of bushings extending outwardly of said metal housing to provide exterior connection points for each of said interrupter structures;
• an operating mechanism disposed exteriorly of said elongated metal housing and having operating shaft means connected to each of said interrupter structures for simultaneously operating each of said interrupter structures;
• each of said insulator bushings comprising a hollow gas-filled insulation shell, a central conductive stud coaxial with said shell and extending the length of said bushing and connected to an end of a respective one of said interrupter structures, and a conductive end plate at the free end of said bushing;
• said conductive end plates being compressed against the free ends of their said respective insulation shells;
• said conductive end plates being welded to an end of their said respective central conductive stud to produce an integral conductive stud and end plate structures for each of said bushings.