Abstract: A current transformer for a load switch which has an interior construction tightly engaged with a main bushing therein, allows a voltage in a cable to be detected by forming an engaging hole, communicated with a conductive socket of the main bushing, on a portion of an outer circumferential surface thereof, and which has a current transformer coating casing, made of a rubber material, for thereby diminishing a thickness of the current transformer, includes a core in a ring shape, a coil winding the core, a rubber coating member for tightly covering the core and the coil therein, and coil terminals connected to both ends of the coil. The rubber coating member includes a lower coating part for tightly covering a base unit of the main bushing, and an upper coating part for tightly covering a jaw unit of the main bushing, as well as the coil and the core.

Abstract: The present invention provides a floating shield for a high voltage bushing. Preferably the bushing is conically shaped and has a composite housing for substantially optimizing the electrical performance of the bushing according to the invention. The floating shield is preferably suspended within the bushing housing by a supporting insulator placed in a low electrical stress region of the bushing. In a preferred embodiment, the supporting insulator is disposed between a ground grading shield and the bushing housing. The composite housing preferably provides a protective inner tube made of a fiber reinforced material and an outer silicone rubber housing having weather sheds formed in a helix on the surface of the housing.

Abstract: Two electrical conduit sections are attached to a thermal expansion joint which permits relative axial movement between the conduit sections. One of the conduit sections has an end portion which is axially slidably disposed inside of the expansion joint. A ring shaped grounding element is mounted on a screw thread formed in that slidable end portion and is disposed in sliding connection with a cylindrical surface of the joint which surrounds the slidable end portion.

Abstract: A feedthrough bushing for a high voltage diode provides for using compression sealing for all sealing surfaces. A diode assembly includes a central conductor extending through the bushing and a grading ring assembly circumferentially surrounding and coaxial with the central conductor. A flexible conductive plate extends between and compressively seals against the central conductor and the grading ring assembly, wherein the flexibility of the plate allows inner and outer portions of the plate to axially translate for compression sealing against the central conductor and the grading ring assembly, respectively. The inner portion of the plate is bolted to the central conductor for affecting sealing. A compression beam is also bolted to the central conductor and engages the outer portion of the plate to urge the outer portion toward the grading ring assembly to obtain compression sealing therebetween.

Abstract: A gas insulated current transformer wherein the metal tank having the inductive unit therein is mounted on the hollow insulating bushing and preloaded with spring pressure so that when the insulating gas within the bushing and the container reaches a predetermined and maximum safe limit the excess build up of gas pressure is allowed to escape between the otherwise sealed contact between the container and the bushing.

Abstract: An electrical bushing comprises a central conductor supported at the opposite ends of a hollow insulating tube, one end of the central conductor being axially movable relative to the insulating tube. A stationary terminal element is secured and electrically connected to the movable end of the central conductor, and a movable terminal is disposed axially movable relative to the stationary terminal element. An expansion chamber housing with a terminal cap for defining therein an expansion chamber is hermetically attached to the insulating tube to enclose the movable end of the conductor. A flexible conductor is used for electrically connecting the stationary terminal element and the movable terminal element while allowing an axial movement therebetween, and a compression spring axially biases the movable terminal element against the terminal cap to establish an electrical contact therebetween.

Abstract: An electrical insulating bushing for conversion between various current ratings and characterized by a tubular column including an insulating portion, a tubular conductor extending through the column and connected to terminals at the top and bottom of the column, and another conductor disposed within the tubular conductor and connected to the terminal at the top of the column. In order to convert the bushing to a different current rating, a replacement conductor is provided which can be substituted for the conductor within the tubular conductor. The replacement conductor and tubular conductor are electrically connected together in spaced alignment near the bottom terminal by a conductive annulus and a coil spring.

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: First and second conductive flanges adjacent first and second ends of a hollow insulator column are biased together by a through-rod assembly such that the first and second flanges cooperate with the insulator column to form a substantially enclosed chamber. The through-rod assembly means includes three coaxial cylinders connecting the first conductive flange to the second conductive flange. The innermost cylinder is connected to the first conductive flange and extends internally into the enclosed chamber. An external shoulder extends from the distal end of the first cylinder and supports one end of a second cylinder. The remaining end of the second cylinder terminates at an internal flange extending from the distal end of a third cylinder which extends from the second conductive flange.

Abstract: A termination applicable to electric power cables for normal, high and very high voltages comprises a housing for accommodating an end length of the cable shield, or a shield section including the shield end and a cable length extending beyond said shield end and comprising the conductor and associated insulation. Provision is made within the housing for a conductive fluid body having completely immersed therein the shield section including the shield end, and an insulating fluid body fully or partially filling up the remaining space within the housing, the latter being suited to receive and contain said fluids with a good sealing effect.

Abstract: An electric penetration assembly for passing electrical conductors through the wall of a pressure vessel has at least one hermetically sealed electric feed-through conductor surrounded by an insulator. The insulator is symmetrical about an axis parallel with the conductors and is impervious with a pervious means disposed between the ends. The insulator is shaped wherein an external conical section is disposed between two external cylindrical sections and wherein the pervious means communicates with the conical section. The assembly is inserted into a header plate having at least one transverse aperture formed with a female conical section disposed between two female cylindrical sections. In the female conical sections are formed two axially spaced grooves for accepting O-ring type gaskets and the plate has at least one capillary bore formed therein which communicates with the conical section and with one face of the plate.

Abstract: An electrical insulating bushing with longitudinally extending channels for parallel coolant flow across the entire inner and outer surfaces of a hollow conductor. A first channel is formed by a plurality of ducts disposed between the conductor and a layer of insulative material which surrounds the electrical conductor; while a second channel is formed by a tubular member concentrically disposed within and radially spaced from the electrical conductor. An insulative bushing housing is spaced from the outer surface of the layer of insulative material to form a longitudinally extending third channel, the ends of which are in fluid flow communication with the ends of the first channel.

Abstract: A stud for a terminal bushing is cooled by a liquid flowing through a spiral groove formed in a juncture of telescoping tubular members utilized to form the conducting stud of the terminal bushing.

Abstract: A bushing for leading an electrical connector through a wall or the like has an intermediate flange for attachment in the wall and two metallic end flanges on either side of the intermediate flange. Two hollow insulating bodies are clamped between the intermediate flange and the end flanges, and a bushing conductor runs the length of the bushing. The bushing conductor is movable in relation to the remainder of the bushing or at least in relation to one of the end flanges. A drawing member is connected between the end flanges and is composed of first and second elongated metallic bodies each of which is attached to the corresponding end flanges overlapping each other for a certain distance. A pressure transmitting member, which is formed of a material with a greater coefficient of thermal expansion than the first and second metallic bodies, forms a power transmitting connection between the free ends of the metallic bodies.