Abstract: According to this invention, therein is provided a puffer-type compressed gas circuit interrupter comprising stationary and movable contacts and a stationary cylinder, a movable piston, connected to the movable contacts and which slides in the stationary cylinder to compress the sulfur hexafluoride insulating gas therebetween to provide a puffing action to extinguish the arc drawn between the separating stationary and movable contacts. The puffer apparatus is disposed within an insulating tube which has a plurality of openings therein disposed about the stationary contact. The tube, with the puffer apparatus disposed therein, is disposed within an outer metallic housing in which an insulating barrier is further disposed between the insulating tube and the housing. The insulating barrier, which lines the inside of the outer housing, is disposed adjacent to the apertures in the insulating tube so as to prevent a dynamic insulation breakdown to ground.

Abstract: A gas insulated transmission line includes a hollow outer conductor having an inner conductor and a support framework disposed therein. A tensioned insulating member is utilized to support the inner conductor within the outer conductor and the support framework. The insulating member is made of flexible insulating filaments which are tensioned to a predetermined amount which is greater than the tension caused by suspending the weight of the inner conductor alone.

Abstract: A power circuit breaker has a novel trip valve on the pneumatic operating mechanism for reducing air consumption of the breaker pneumatic operating mechanism. The novel trip valve includes the addition of a valve stem extension to the trip valve shaft disposed in a sliding fit with an exhaust port to the trip valve actuating cylinder which together provide for quick elimination of compressed air from the trip valve actuating cylinder at a predetermined time during the operation of the breaker mechanism. Positive positioning of the breaker contact and rapid closing of the trip valve at a predetermined time is effectuated, thereby reducing air consumption while providing a fail-safe air cushion to the driving piston of the pneumatic mechanism to insure positive positioning of the breaker contacts.

Abstract: A process for preparing the interior of a corrugated pipe or sheath comprises the steps of placing a predetermined amount of a tumbling abrasive material into the sheath, and then rotating the sheath.

Abstract: A gas-insulated bushing comprises an elongated epoxy insulating shell having a grounded mounting plate secured at one end thereof and an electrical connection terminal secured at the other end thereof. An inner conductor at high voltage is disposed within the shell and is secured to the terminal, with an insulating gas electrically insulating the inner conductor from the shell. An electrically grounded ground shield is cast into the epoxy shell and extends outwardly to physically and electrically contact the grounded mounting plate. A throat shield is secured to the mounting plate and extends longitudinally into the interior of the shell. The dual shield system disclosed functions to inhibit puncturing of the insulating shell, with a resultant loss of insulating gas, in the event of either internal or external flashovers.

Abstract: An electric circuit interrupter comprising a pair of separable contacts, an operating mechanism for opening and closing the contacts and a drive mechanism including a cylinder-piston assembly and a gas pressure generator having multiple stationary combustion chambers and a directing device for selectively directing an expulsion of gaseous medium from any one of the multiple stationary combustion chambers.

Abstract: A particle trap to outer elongated conductor or sheath contact for gas-insulated transmission lines. The particle trap to outer sheath contact of the invention is applicable to gas-insulated transmission lines having either corrugated or non-corrugated outer sheaths. The contact of the invention includes an electrical contact disposed on a lever arm which in turn is rotatably disposed on the particle trap and biased in a direction to maintain contact between the electrical contact and the outer sheath.

Abstract: A gas-insulated transmission line includes a corrugated outer conductor, an inner conductor disposed within and insulated from the outer conductor by means of support insulators and an insulating gas, and a transport device for supporting and permitting movement of the inner conductor/insulating support assembly axially along the corrugated outer conductor without radial displacement. The transport device includes two movable contacts, such as skids or rollers, supported on a common pivot lever, the pivot lever being rotatably disposed about a pivot lever axis, which pivot lever axis is in turn disposed on the periphery of a support insulator or particle trap if one is used. The movable contacts are separated axially a distance equal to the axial distance between the peaks and valleys of the corrugations of the outer conductor and separated radially a distance equal to the radial distance between the peaks and valleys of the corrugations of the outer conductor.

Abstract: A gas-insulated circuit breaker is described which includes a Y-shaped, hollow grounded metal base member formed from a support section and two angularly-extending legs. A hollow insulating casing is secured to each base member leg. A stationary and a movable contact, separable from each other to establish an arc therebetween, are disposed in one of the casings, with an insulating gas disposed within both the base member and the insulating casings. A mechanism is used for directing a blast of insulating gas into the arc established between the separating contact, and includes a piston fixedly disposed in the one casing and a puffer cylinder secured to the movable contact and movable over the piston to compress the gas therebetween. An operating mechanism is associated with the base member support section for moving the movable contact, and a drive rod insulatably connects the movable contact and the operating mechanism. The operating mechanism thus moves the movable contact through the insulating drive rod.

Abstract: Gas insulated electrical apparatus having first and second conductors separated by an insulating support within an insulating gas environment, and particle traps disposed along the surface of the high potential conductor for trapping and inactivating foreign particles which may be present within the insulating gas medium. Several embodiments of the invention were developed which are particularly suited for vertically aligned gas insulated transmission lines. The particle traps are grooves or cavities formed into the walls of the tubular inner conductor, without extending into the hollow portion of the conductor. In other embodiments, the traps are appendages or insert flanges extending from the inner conductor, with the insulator supports contacting the appendages instead of the inner conductor.

Abstract: An electric circuit interrupter comprising a drive mechanism with a stationary drive piston and a movable drive cylinder for actuating an operating mechanism to selectively open and close a pair of separable contacts.

Abstract: An improved puffer-type compressed-gas circuit interrupter includes a stationary tubular contact and a movable contact structure operably engageable with the stationary contact when the circuit interrupter is closed. A hollow nozzle directs a blast of compressed gas into the arc established between the stationary contact and the movable contact during opening. The nozzle in the interior thereof has a neck portion of predetermined diameter for directing the blast of compressed gas into the arc. The stationary contact has venting apertures therein of predetermined size and shape with at least a portion of the venting aperture means being within a predetermined section of the stationary contact. The stationary contact section has a length measured along the axis of the stationary contact equal to about three times the inside diameter of the stationary contact.

Abstract: A gas-insulated transmission line includes an outer enclosure, an inner conductor insulatably supported within the outer conductor, and an insulating gas providing electrical insulation of the inner conductor. The outer enclosure includes a cylindrical insulating pipe or sheath with a separate electrostatic shield disposed on the sheath. The pressure containing function is separated from the electrostatic shielding function, thereby minimizing the use of the more expensive electrostatic shielding material for the pressure containing function.

Abstract: A disconnect switch and grounding apparatus therefor particularly adapted for use in gas insulated substations. The disconnect switch comprises a chamber having a pair of electrical conductors entering the chamber. Supporting the conductors and insulating them from contact with the chamber itself are insulators, which may be sealingly placed so as to prohibit the escape of the gas. A fixed contact member electrically attached to the first of the pair of conductors and a movable contact member is electrically attached to the second pair of conductors. A movement mechanism to move the movable contact members so as to make and break contact with the fixed contact member. A grounding strip electrically attached to the movable contact member, positioned so as to come in contact with the chamber wall immediately after the breaking of contact between the fixed and the movable contact members.

Abstract: A gas-insulated transmission line includes an outer enclosure, an inner conductor insulatably supported within the outer conductor, and an insulating gas providing electrical insulation of the inner conductor. The outer enclosure includes a cylindrical insulating pipe or sheath with a separate electrostatic shield disposed on the sheath. The pressure containing function is separated from the electrostatic shielding function, thereby minimizing the use of the more expensive electrostatic shielding material for the pressure containing function.

Abstract: A low-pressure gas-insulated bushing is provided including an elongated, hollow insulating shell having a terminal end and a throat end with a opening therethrough. A bushing terminal is secured to the shell terminal end, and an insulating gas at low pressure is disposed in the shell. A tubular electric conductor is disposed in the shell and extends outwardly therefrom through the throat end opening. The conductor is in electrical contact with the terminal end, thereby providing electrical connection to an overhead line. The conductor is expanded in diameter in the vicinity of the throat end to minimize the throat diameter required, while the conductor at the remainder of its length is sized to carry the rated current of the bushing.

Abstract: A gas-insulated bushing includes an elongated hollow insulating shell with an elongated inner conductor disposed therein spaced apart from the insulating shell, with an insulating gas electrically insulating the conductor from the insulating shell. A terminal is sealingly secured to the insulating shell and prevents the escape from the interior of the shell of the insulating gas disposed therein. The terminal includes an electrical connector which is external to the shell and which includes a portion extending inwardly into the shell. This electrical connector is aligned with, but spaced apart from, the electrical conductor to provide room for thermal expansion of the electrical conductor.

Abstract: A gas-insulated transmission line includes an outer enclosure, an inner conductor insulatably supported within the outer conductor, and an insulating gas providing electrical insulation of the inner conductor. The outer enclosure includes a cylindrical insulating pipe or sheath with a separate electrostatic shield disposed on the sheath. The pressure containing function is separated from the electrostatic shielding function, thereby minimizing the use of the more expensive electrostatic shielding material for the pressure containing function.

Abstract: An electric switch includes a pair of separable contacts operable between open and closed positions with respect to each other. An operator shaft is utilized for moving one of the contacts, and the operator shaft has attached thereto at the opposite end an operator piston which is disposed within an operator cylinder. A chemical operator is utilized for generating a hot gas within the operator cylinder and against the operator piston to cause movement thereof.

Abstract: Apparatus for coating selected portions of the troughs of a corrugated pipe within an adhesive includes a support disposed within the pipe with a reservoir containing the adhesive disposed on the support. A pump, including a spout, is utilized for supplying the adhesive from the reservoir to a trough of the pipe. A rotatable applicator is supported on the support and contacts the trough of the pipe. The applicator itself is sized so as to fit within the trough, and contacts the adhesive in the trough and spreads the adhesive in the trough upon rotation. A trough shield, supported by the support and disposed in the path of rotation of the applicator, is utilized to prevent the applicator from contacting selected portions of the trough. A locator head is also disposed on the support and provides a way for aligning the spout, the applicator, and the trough shield with the trough.