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Vladimir Zworykin, television pioneer ; Talking about an invention in which he played a critical role.
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| Number | Title | Issue Date |
| 8081054 | Hyper-cooled liquid-filled transformer A transformer is disclosed that includes a housing having a core-winding assembly positioned therein that is immersed in a dielectric transformer fluid contained within the housing. A cooling system is provided to cool the dielectric transformer fluid contained with... | 12/20/2011 |
| 7902951 | Hermetically sealed electrical apparatus An electric apparatus, preferably a transformer, is hermetically sealed and filled with a dielectric liquid. Devices for recording heat-related volume variations of the dielectric liquid are contained in the apparatus. Volume variations are compensated with the aid ... | 03/08/2011 |
| 7760060 | Vehicle transformer In a vehicle transformer including a core 1, a winding 2, a rectangular tank 3 holding them, a cooling unit 7 for cooling a cooling medium 6 filling the tank 3, and a circulating pump 8 for forcibly circulating the co... | 07/20/2010 |
| 7330096 | Fault current limiter A fault current limiter (FCL) comprises: an air core flat clock spiral inductor comprising wound electrically conductive material and insulated turns; and two terminations configured for attaching the spiral inductor in series with a power carrying conductor. ... | 02/12/2008 |
| 7317598 | Electric transformer explosion prevention device A device for preventing the explosion of an electric transformer equipped with a tank filled with combustible coolant fluid, includes a pressure relief element to decompress the tank, a reservoir arranged downstream of the pressure relief element and at least one st... | 01/08/2008 |
| 7310242 | Self-shielding high voltage distribution box A distribution box for enclosing an electrical connection in an electrical wiring system includes a housing that is resistive to penetration by electromagnetic fields and a plurality of electrical conductors that form the electrical connection. A mirror plate is dis... | 12/18/2007 |
| 7301743 | Device and a method for advanced protection from short circuit current A two channel universal device for advanced protection from a short circuit current which evaluates a rate-of-change of current in a supply feeder and compares the current in the supply feeder and the current in load phases generating a differential signal in such a... | 11/27/2007 |
| 7205874 | Method and apparatus for decreasing gassing and decay of insulating oil in transformers The invention deals with increasing the quality of insulating mineral oil in transformers, by providing an isolating layer of flowing nitrogen over the oil's surface to keep ambient air from combining or absorbing with or in the oil, also providing a kidney or filte... | 04/17/2007 |
| 7205875 | Hybrid air/magnetic core inductor An inductor includes an elongate magnetic core, a coil wrapped around the core and a spacer that separates the coil from the core to provide a coolant passage between the coil and the core. The coolant passage may include an air passage that extends substantially pa... | 04/17/2007 |
| 7161456 | Systems and methods for driving large capacity AC motors A drive system for driving large capacity motors includes a motor and a variable frequency drive which accepts input from a three-phase power source. The drive system includes a step-up transformer, preferably of a high-capacity three-phase type, positioned between ... | 01/09/2007 |
| 7071678 | Low power consuming current measurements for high currents This invention propose a way of controlling the flux density in a current transformer to keep the transformer core saturated between two consecutive measurements in a sampling measurement system. Saturation disables transformation of primary to secondary current, an... | 07/04/2006 |
| 7049922 | Method and apparatus for decreasing gassing and decay of insulating oil in transformers The invention deals with increasing the quality of insulating mineral oil in transformers, by providing an isolating layer of flowing nitrogen over the oil's surface to keep ambient air from combining or absorbing with or in the oil, also providing a kidney or filte... | 05/23/2006 |
| 6985061 | Arrangement and method for installing a subsea transformer An arrangement and a method for use in installation procedures for subsea transformers. A central, hole or tube is included in an encapsulation enclosing a transformer that is to be installed. Three core elements of the transformer are arranged symmetrically around ... | 01/10/2006 |
| 6980450 | High power density inverter and components thereof A compact high-power pure-sinewave inverter amenable to mass manufacturing techniques. Methods for increasing the power rating, power density and/or power conversion efficiency of a sinewave-modulated pulse-width-modulated (PWM) inverter having a either half-bridge ... | 12/27/2005 |
| 6954129 | Wire core inductive devices having a flux coupling structure and methods of making the same An inductive device (10) comprises a magnetic core (16) including a portion of a plurality of wires (18), an electric winding (20) extending around said magnetic core, with one or more of the plurality of wires (18) at least partia... | 10/11/2005 |
| 6914195 | Distribution transformer An oil-filled pole-mounted distribution transformer comprises a tank housing a transformer core-coil assembly immersed in cooling oil. The tank is made of a corrosion-proof composite material and a radiator is provided for cooling the oil. The radiator is external t... | 07/05/2005 |
| 6909349 | Apparatus and method for cooling power transformers A system (27) for reducing the temperature of cooling oil for a power transformer (12) includes a heat exchanger (44) interposed in the cooling oil system. The heat exchanger (44) relies upon a liquid-to-liquid exchange of heat from the h... | 06/21/2005 |
| 6905638 | Vegetable oil based dielectric fluid and methods of using same In one aspect, the present invention provides a dielectric fluid for use in electrical equipment comprising a vegetable oil or vegetable oil blend. In another aspect the invention provides devices for generating and distributing electrical energy that incorporate a ... | 06/14/2005 |
| 6873236 | Fault current limiter A fault current limiter (FCL) comprises: an air core flat clock spiral inductor comprising wound electrically conductive material and insulated turns; and two terminations configured for attaching the spiral inductor in series with a power carrying conductor. ... | 03/29/2005 |
| 6838968 | Transformer with forced liquid coolant In order to cool the windings, core and optionally the wall of the element (1) receiving the windings (3,4) and the core (2) as effectively as possible, conducting surfaces (5, 6, 8,15) are disposed inside said element in such a way that ... | 01/04/2005 |
| 6709496 | Air demoisturizer for oil-insulated transformers, chokes and tap changers An air demoisturizer for an oil expansion vessel of an electrical power unit like an oil-filled transformer, tap changer or choke, has a heating element in the body of absorbent and utilizes a heat-regeneratable absorbent which is cut off by a moisture detector from... | 03/23/2004 |
| 6661322 | Sound-insulating device for an induction machine A sound-insulating device for a stationary induction machine with an active part, an insulating fluid surrounding the active part, and a tank enclosing the insulating fluid. The sound-absorbing device includes a gas-filled cavity and a resilient member su... | 12/09/2003 |
| 6613250 | Vegetable oil based dielectric fluid and methods of using same In one aspect, the present invention provides a dielectric fluid for use in electrical equipment comprising a vegetable oil or vegetable oil blend. In another aspect the invention provides devices for generating and distributing electrical energy that inc... | 09/02/2003 |
| 6563410 | Small footprint power transformer incorporating improved heat dissipation means A small footprint power transformer constructed so as to exhibit improved heat dissipation characteristics and an enhanced flow of a cooling medium. The transformer construction achieves small footprint by superimposing the core legs with the windings in ... | 05/13/2003 |
| 6549110 | Compensating device suitable for use in railway car transformers A compensating device suitable for use in railway car transformers has at least one compensation receptacle in fluid communication connection with the interior of the housing of a transformer and having a fluid volume. A separating element limits the flui... | 04/15/2003 |
| 6529108 | Electric appliance In an electric apparatus, insulating cylinders having different diameters are arranged in a shape of multiple cylinders between the iron core and the low voltage winding, between the low voltage winding and the high voltage winding and on the periphery of... | 03/04/2003 |
| 6522229 | Transformer The invention relates to a transformer tank generally shaped like a rectangular prism and filled with insulating liquid and assembled mainly by welding. The tank comprises a detachably fastened transformer cover plate and a transformer core placed in the ... | 02/18/2003 |
| 6456179 | Transformer A container (2) with an oil immersed core (1) and windings has corrugated walls. Bushing insulators (9,10) have pressure-resistant and water-resistant cable shoes (11). A tank encompasses another container (4) filled with insulating oil (3) and has pressu... | 09/24/2002 |
| 6398986 | Food grade vegetable oil based dielectric fluid and methods of using same In one aspect, the present invention provides a dielectric fluid for use in electrical equipment comprising a vegetable oil or vegetable oil blend. In another aspect the invention provides devices for generating and distributing electrical energy that inc... | 06/04/2002 |
| 6384703 | Fully immersed magnetic transformer with multiple condensing surfaces and method A sealed transformer for use in charging the batteries of an electric automobile includes a housing that contains the secondary windings, a core and a dielectric fluid. A removable primary winding coupler is inserted into the housing to complete a magneti... | 05/07/2002 |
| 6217634 | Apparatus and method for monitoring and purifying dielectric fluids The present invention monitors and removes contaminants from dielectric fluids by utilizing an apparatus having a chamber and tube configuration. The chamber encloses a plurality of tubes which include porous hollow fibers with an inert polymer coating. C... | 04/17/2001 |
| 6185099 | Cooling device for an electronic power system Electronic power system is connected at an input to an electrical supply cable (24) and at an outlet to a conductive cable (17) connected to a system of current transmission, the whole of the device being adapted to be buried in the ground in a concrete b... | 02/06/2001 |
| 6157282 | Transformer cooling method and apparatus therefor This invention relates to a cooling system for a transformer. A winding defining a coil, including a duct having an open top and bottom, is sealed to a sleeve, thus forming a closed circulatory path. A fluid is retained and circulated within the circulato... | 12/05/2000 |
| 6052060 | Temperature monitor for electrical switchgear Insulating oil in electric power transmission switchgear such as a load tap changer for a transformer is filtered for removal of accumulated water and carbon particles. The filter and associated circulation pump is usually located in a separate cabinet ex... | 04/18/2000 |
| 5912215 | Food grade dielectric fluid A food grade, biodegradable dielectric composition and method for preparation thereof, comprising an unsaturated hydrocarbon alone, or in a blend with a food grade natural or synthetic hydrocarbon, which has been processed to remove polar contaminants and... | 06/15/1999 |
| 5778863 | Ignition coil for an internal combustion engine To provide an ignition coil for an internal combustion engine which improves high-voltage sealing performance and moreover reduces housing outer diameter, an ignition coil for an internal combustion engine is made up of a transformer portion of cylindrica... | 07/14/1998 |
| 5736915 | Hermetically sealed, non-venting electrical apparatus with dielectric fluid having defined chemical composition An electrical apparatus, such as a transformer, includes an expandable internal chamber that is nonventing and completely and permanently sealed from the ambient environment. The chamber houses a core and coil assembly or other current-carrying conductor ... | 04/07/1998 |
| 5462685 | Ferrofluid-cooled electromagnetic device and improved cooling method A convection-cooled electromagnetic device, such as a transformer, and methods of cooling that utilize a ferrofluid as a cooling medium. The device's leakage magnetic field, which can be augmented by auxiliary magnets, draws the ferrofluid toward the devi... | 10/31/1995 |
| 5341083 | Contactless battery charging system A contactless recharging system and method for recharging a battery storage device onboard an electric vehicle has a primary converter station for converting power from a power source into high frequency power at a selected charging rate. The vehicle has ... | 08/23/1994 |
| 5336847 | Stationary induction apparatus containing uninflammable insulating liquid An nonflammable insulating liquid is obtained by adding an emulsifying agent having a volume ratio of 1 to 3% to an insulating liquid containing a fluorocarbon liquid of at least 25% in a volume ratio to cause emulsification. In this liquid mixture, when ... | 08/09/1994 |
