Abstract: The invention, intended for large power transformers and industrial heat transfer installations, is systemic in nature and calls upon two components which complement each other, the first one effecting the continuous on-line de-gassing of an insulating or heat transfer medium by the application of a vacuum whose pressure reducing effect is compensated by hydrostatic pressure or the combination of an impeller downstream and a restrictor upstream of the pressurized part; the second component of the complementary system is constituted by an expansion space which is separated from a displaceable buffer liquid by a membrane.

Abstract: A waterproof box-like casing including, a box-like body having an opening, a lid for closing the opening and having a communication hole, and a bulkhead member for covering the communication hole hermetically. The communication hole provides communication between the inside and outside of the box-like body. Furthermore, the bulkhead member expands volume when the air inside of the waterproof box-like casing expands because of thermal expansion and contracts volume when the air inside of the waterproof box-like casing contracts because of thermal contraction.

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: An insulting-liquid immersed electrical machine comprises an electrical machine, a hermetically sealed tank containing the electrical machine, and insulating liquid arranged between the electrical machine and the tank, wherein the tank includes a deformable member through which gas and liquid cannot pass and whose shape is variable so that a receiving volume capable of receiving the insulating liquid between the tank and the electrical machine is variable. The insulating liquid completely fills the receiving volume in the tank, and a pressurizing arrangement is provided for adjusting the shape of the deformable member so that the pressure of the insulating liquid in the tank is kept at a suitable degree for preventing the insulating liquid from vaporizing.

Abstract: A housing for an electric device, such as a power transformer or an X-ray tube, comprises a tank which contains electric components of the device and which is filled with an insulating and/or cooling liquid, such as. A lid is arranged at a planar top portion of the tank and hermetically sealed thereto. The lid is at least partially flexible for enabling movement of the lid when the liquid expands and contracts due to heating and cooling, respectively. In a preferred embodiment, the lid comprises a gasket at its periphery and a rigid portion at its center. A frame can be provided for pressing the gasket against the tank. At the frame, at least one rod or spring can be fastened for guiding the movement of the lid perpendicular to the plane of the planar top portion.

Abstract: A transformer of the type used to produce high voltage for an electrostatic field apparatus has a hermetically sealed container. The container encloses a coil assembly having primary and secondary coils wound on a common core. Electrical terminals extend outward from the container and are connected to the coils. The interior volume of the container is completely filled with a thermally conductive, electrically non-conducting fluid. The internal pressure of the transformer is less than one atmosphere at 22.degree. C. The transformer can be operated in any mounting orientation of its rated power. A method of manufacturing the transformer is described by which gases are removed from the container so that it can be completely filled with the fluid.

Abstract: A unique air vent is provided for use with heat-recoverable closures when installed on pressurized cables. Typically, when a heat-recoverable closure is used to repair a hole or opening in the jacket of a pressurized cable the cable must be depressurized during installation of the closure to ensure formation of a pressure and watertight seal. The air vent assembly permits installation of a heat-recoverable closure without the need for depressurizing the cable. After installation, the air vent can be used as an access point to the pressurized air within the cable.

Abstract: In an electronic package in which a fluid is encased to provide efficient thermal transfer between electronic components and cooling plate, the thermal expansion of the cooling fluid is compensated for by tubing in the enclosure. The tubing is vented to the atmosphere and as the cooling fluid expands, the tubing is compressed. The tubing is generally coiled within the chamber and can have a kink in the center region, dividing the tubing into two portions. Both portions of the tubing are vented to the external environment. In the preferred embodiment, surgical tubing is employed to compensate for the thermally induced changes in volume.

Abstract: A pressure regulating device for fluidtight, fluid-filled apparatus comprises a solid body with a shallow recess in a surface enclosed by a flexible diaphragm. A narrow passage, preferably of capillary dimensions, connects the recess to the interior of the apparatus and the diaphragm is flexible enough to be deformed without injury so as to enter the recess and reduce its volume substantially and preferably practically to zero. The recess contains a volume of air which for optimum performance should be equal to the amount by which the volume can be reduced by movement of the diaphragm and also equal to the volume expansion of the fluid (or if more than one device is fitted its share of the fluid) from atmospheric conditions to mean working temperature (less the volume of any air occluded elsewhere in the apparatus). By this means, the diaphragm is substantially unstressed both under atmospheric conditions and under mean working conditions, since the gas will be compressed to a negligible volume.

Abstract: In a high-voltager transformer including a closed casing, a magnetic core with at least one winding, a cooling liquid filling the casing and surrounding the winding, and insulated casing lead-throughs for connecting external lines to the winding, a compensating device forms part of the casing and is exposed to the cooling liquid for permitting expansion of the cooling liquid on being heated, and the cooling liquid is subjected to a pressure greater than that of the ambient air at all operating temperatures of the transformer.

Abstract: Method and apparatus for replacing flammable, insulating oil in an oil-filled electric cable by non-flammable, insulating oil in which the flammable oil is withdrawn at least from the cable oil duct under vacuum and with heating of the cable to its maximum operating temperature and thereafter, the flammable oil which was withdrawn is replaced by non-flammable oil. During operation of the cable, oil which flows out of the cable during heating of the cable is sent to a first reservoir, through a check valve and during subsequent cooling, such oil is replaced by non-flammable oil from a second reservoir containing non-flammable oil and connected to the cable duct by a check valve. Also, an oil-filled cable having its insulation impregnated with flammable, insulating oil or a mixture of such oil with non-flammable, insulating oil and having an oil duct filled with a non-flammable, insulating oil which is different from the flammable oil.

Abstract: An enclosure includes a closed housing having a wall dividing the housing into a first compartment containing a high voltage portion of the power supply and a second compartment containing a low voltage portion of the power supply. A dielectric fluid fills the first compartment and partially fills the second compartment. A first check valve disposed in the wall enables fluid to flow from the first compartment to the second compartment during a temperature increase to compensate for expansion of the fluid in the first compartment. A second check valve disposed in the wall, in communication with the fluid in the second compartment, enables the fluid to flow from the second compartment to the first compartment during a temperature decrease to maintain the first compartment full of the fluid.

Abstract: An ebullition cooled transformer has a housing, a core and coil assembly disposed on the lower portion of the housing to be immersed into a condensible electrically insulating refrigerant, a cooler unit located above the core and coil assembly within the housing, and a communicating tube disposed at the top of the housing to communicate with the outside air and provided with a porous filter permitting the air to permeate it but preventing a vapor of the refrigerant from permeating it.

Abstract: A heat dissipating container for electrical components immersed in a liquid dielectric in one chamber and for electrical components surrounded by an air dielectric in another chamber. A flexible bladder serves as a common wall with the liquid dielectric chamber and an air filled recess that is in communication with the air filled chamber to compensate for expansion and contraction of the liquid.

Abstract: A compressed gas insulated high voltage line which has a metal encapsulation and supports the high voltage conductors on support insulators in which movability of the conductor in the axial direction relative to the encapsulation is provided by means of at least two parallel, sliding guidance pins extending parallel to the axis of the high voltage conductor and the encapsulation. The pins are connected to one end of the support insulator and provide longitudinal movability for accommodating length changes of the high voltage conductor relative to the encapsulation under thermal stress.

Abstract: Electrical inductive apparatus cooled and electrically insulated by a vaporizable liquid dielectric having a boiling point within the normal operating temperature range of the apparatus. When the electrical inductive apparatus is at ambient temperature, the liquid dielectric completely fills the enclosure providing electrical insulation for the electrical members. As the temperature of the apparatus increases towards its normal operating range, the liquid dielectric is gradually withdrawn into a reservoir until, at the normal operating temperature, only a quantity of liquid dielectric sufficient to completely cover the electrical inductive apparatus remains in the enclosure. In response to a temperature decrease, the liquid stored in the reservoir is gradually returned to the enclosure thereby maintaining a constant level of dielectric strength between the electrical members.

Abstract: Gas-insulated electrical apparatus is connected to oil-insulated electrical apparatus within an intermediate oil-filled tank having an oil pressure lower than the pressure within the oil-insulated apparatus. If gas leaks into the relatively low pressure oil, the gas contaminated oil cannot leak into the oil-insulated equipment. The intermediate oil-filled tank has larger electrical clearances than the oil-insulated apparatus.

Abstract: The arrangement includes an enclosed container containing therein high voltage electrical components. A dielectric oil is disposed in and completely fills the container. A volume/pressure compensator is fastened to the bottom inner surface of the enclosed container with the compensator including a confined compressible dielectric material compatible with the dielectric oil chemically, thermally and structurally.

Abstract: An expansion joint is provided that accommodates dimensional changes occurring during the cooldown and warm-up of large cryogenic devices such as superconducting magnet coils. Flattened tubes containing a refrigerant such as gaseous nitrogen (N.sub.2) are inserted into expansion spaces in the structure. The gaseous N.sub.2 is circulated under pressure and aids in the cooldown process while providing its primary function of accommodating differential thermal contraction and expansion in the structure. After lower temperatures are reached and the greater part of the contraction has occured, the N.sub.2 liquefies then solidifies to provide a completely rigid structure at the cryogenic operating temperatures of the device.

Abstract: An electrical penetration assembly for a nuclear reactor containment wall in which solid copper conductors are removably mounted into the penetration canister from outside the containment wall. Each conductor is mounted in a feedthrough pipe by glass-sealed headers, one of which has a metal bellows that permits axial expansion of the conductor when it is subjected to elevated temperatures.

Abstract: The invention relates to a method of manufacturing phase cores for oil-filled cables and apparatus therefor, whereby a current-carrying core is obtained by means of twisting together a number of individual wires, then a paper insulation tape is wound around the current-carrying core and the insulated current-carrying core is reeled on a drum, after which the core is dried, impregnated with an insulating compound and placed in a provisional sealed housing for the period of storage and shipment to the site where the core is to be laid out and inside which the core is subjected to the required electrical measurements and insulation tests. The current-carrying core is placed inside the provisional sealed housing right after it is has been wound with the paper insulation tape.

Abstract: A coupling flex-plate member comprising a circular metallic member having a centrally-disposed annular groove provided therein, providing a generally H-shaped cross-section, is fixedly secured to the confronting ends of adjacent inner high-voltage tubular conductors of a gas-insulated transmission line to permit a limited, but sufficient flexibility, of the inner conductor sections, or conductor buses. A low-strength high-conductivity material is used for the coupling flex-plate member, and permits an axial bending in a spring-like fashion until material yielding occurs. Inaccuracies during fabrication and assembly of the component parts are accommodated by the use of such a coupling flex-plate member without damaging adjacent components, especially spacing insulators, which are, of course, brittle and subject to fracture.

Abstract: An underwater electrical connector having an oil filled chamber in one connector member behind the insulator therein in which the contacts are mounted. A pressure compensating bellows is mounted in the wall of the housing of the connector member. An adjustable piston is also mounted in the wall of the housing for establishing a predetermined pressure on the oil in the chamber, whereby the bellows is preloaded thereby enhancing the pressure compensating characteristics of the bellows.

Abstract: A conservator system for transformers includes a conservator tank. The apparatus is filled with oil which is saturated with a non-combustible gas. The conservator tank is connected by conduits to the top and if suitable also to the bottom of the transformer tank, respectively. The top of the conservator tank is filled with free non-combustible gas. A bag of flexible material is arranged in the top of the conservator tank and the interior of this bag is connected to the atmosphere so that it separates the oil and the gas in the tank from the atmosphere.