Patent application number | Description | Published |
20090206979 | LAYERED ELECTRICALLY CONDUCTIVE MATERIAL - An electrical resistor has an electrically conductive stack, which includes a plurality of metal first layers and second layers. The stack allows to produce a highly anisotropic resistor, in which the resistance in the direction perpendicular to the layers is much higher than in the plane of the layers. The anisotropy allows the current flowing through the stack to be made homogenous, e.g., to be distributed over the entire stack surface, even if the current is input into the stack in an inhomogenous manner. | 08-20-2009 |
20110175695 | HOUSING FOR AN ELECTRIC MACHINE - The disclosure relates to a housing for an electric machine, for example, an electric power transformer, such as a dry-type transformer, with cooling channels being provided within the housing for a cooling medium. The electric machine and a cooling system can be arranged in the housing, with vertically arranged first and second channels for the cooling medium being provided. The medium can flow around the electric machine, with the housing accommodating the electric machine and the cooling system substantially forming a hermetic encapsulation. | 07-21-2011 |
20110291791 | METHOD FOR PRODUCING WINDINGS FOR A DRY-TYPE TRANSFORMER - A method is provided for producing windings for a dry-type transformer with in each case one winding for the low voltage (LV winding) and one for the high voltage (HV winding). The LV and HV windings are each electrically insulated from one another and have layers which are electrically insulated from one another by virtue of, initially, the winding for the low voltage being produced from electrically conductive wire or tape material and an insulating layer including resin-impregnated fibre material. Prior to the application of the HV winding, the maximum insulating thickness for the layer insulation and the number of fibre rovings corresponding to this insulating thickness can be determined, and each winding layer and the associated insulating layer can be produced simultaneously with a physical offset with respect to one another. To produce the winding, fibre polymer layers can be applied, as layers of insulation, simultaneously with the winding conductor between the individual winding layers of the winding, and the finished winding is subjected to a curing operation. | 12-01-2011 |
20120000628 | METHOD FOR FUNCTION MONITORING AND/OR CONTROL OF A COOLING SYSTEM, AND A CORRESPONDING COOLING SYSTEM - Exemplary embodiments relate to a system and method for monitoring functional operational reliability of a cooling system having at least one thermosyphon for transformers provided with at least one evaporator and with at least one condenser. The cooling system using a coolant which can be vaporized and a gaseous medium, as a heat carrier. | 01-05-2012 |
20120056706 | WOUND TRANSFORMER CORE WITH SUPPORT STRUCTURE - A wound transformer core is provided with at least one core loop made of a magnetic material. The transformer core includes multiple thin amorphous band-like iron sheets which are concentrically stacked around at least one center axis. A lower yoke section, an upper yoke section, and at least two limb sections are formed. The transformer core includes a modular plate-like support structure which is affixed upright to the center axis on both face sides of the lower yoke section and on both face sides of each limb section such that neighbored iron sheets are affixed together at their outer edge. The modular plate-like support structure includes, for each face side of the corresponding core sections, at least two plate-like modules, which are each connected to each other by a first or second plug-in connection. | 03-08-2012 |
20120274430 | HEAT EXCHANGER SYSTEM FOR DRY-TYPE TRANSFORMERS - Exemplary embodiments are directed to a heat exchanger system for transformers or reactors having at least one coil being cooled by gaseous fluids circulating around the transformer. The system having an enclosure that houses the transformer and the at least one coil, where flow of cooling gaseous fluid passes over the coil and is heated by the heat of the transformer or reactor the heated gas is directed to pass over a thermosiphon heat exchanger which dissipates the heat to a cooling media. | 11-01-2012 |
20130021130 | ARRANGEMENT HAVING AT LEAST TWO COILS WHICH ARE ARRANGED AXIALLY ONE ABOVE THE OTHER ON A COMMON CORE LIMB - An exemplary arrangement includes blocks arranged between the inner winding, the individual barriers and the outer winding in order to maintain defined spacing's along the circumference. At least two coils are arranged axially one above the other on a common core limb. Each coil has at least two windings arranged radially one above the other and barriers are provided between the windings. The barriers of adjacent coils are radially offset with respect to one another, and the edge regions of the barriers engage one another in a comb-like manner. | 01-24-2013 |
20130113597 | TRANSFORMER WITH SHIELDED CLAMPS - The present disclosure provides for the shielding of clamps of a transformer, and including an electric shielding arrangement for a transformer and a transformer with the arrangement. An electric shielding arrangement for a transformer is provided, with a clamp which is attached at a yoke and stabilizes the yoke of the transformer. The arrangement includes an electric shielding device arranged at the clamp between the yoke and a winding of the transformer and having a trough-like form. The electric shielding device may have the form of a rounded cover and is configured to shield the clamp from an electric field of the winding. | 05-09-2013 |
20130113598 | TRANSFORMER WITH SHIELDING RINGS IN WINDINGS - A coil and electric shielding arrangement for a dry-type transformer includes an electric shielding device arranged at a distance from a winding, at an axial end of the winding perpendicular to a longitudinal axis of the transformer, and parallel to a top surface of a coil that is wound around the axis such that the electric shielding device covers a cross-sectional area of the winding perpendicular to the longitudinal axis. An insulation material attached to the winding and to the electric shielding device establishes a first distance between the winding and the electric shielding device along the longitudinal axis such that the winding is shielded against another electric field. The winding and the electric shielding device are casted in a block which insulates the electric shielding device from the electric field of the winding by establishing a second distance between the winding and the electric shielding device. | 05-09-2013 |
20130127582 | SINGLE- OR MULTI-PHASE DRY-TYPE TRANSFORMER HAVING AT LEAST TWO COILS - A single- or multi-phase dry-type transformer includes at least two coils. A barrier between phases made of an electrically insulating material is arranged in the intermediate space between the individual coils. | 05-23-2013 |
20130176092 | COOLED TRANSFORMER HAVING AT LEAST ONE STRIP WINDING - A strip winding for a transformer includes a plurality of winding modules each having a strip conductor wound around a winding axis. A winding segment is formed by at least two radially adjacent winding modules. At least one cooling channel extending in the axial direction is provided between at least two radially adjacent winding modules. At least two axially adjacent winding segments are provided, and the winding modules are connected electrically in series by connecting conductors. At least one connecting conductor is led at least in sections through the cooling channel along the axial extension of the cooling channel. | 07-11-2013 |
20130181796 | TRANSFORMER WINDING - A transformer winding, having at least two multi-layered winding modules, which are connected electrically in series, extend about a common winding axis, and are nested one inside the other hollow-cylindrically, at least one cooling channel, which is arranged along the common winding axis hollow-cylindrically between the winding modules, and a flat electrical shield is provided within the at least one cooling channel at least sectionally along the radial circumference thereof, wherein the electrical shield extends over approximately the entire axial length and through which electrical shield the electrical capacitance distribution in the transformer winding connected electrically in series is influenced. | 07-18-2013 |
20130293329 | TRANSFORMER WINDING WITH COOLING CHANNEL - At least two winding modules nested hollow-cylindrically one inside the other and extending around a common winding axis, wherein said winding modules are spaced radially apart from one another within at least one hollow-cylindrical cooling channel arranged therebetween by means of insulation strips, wherein the insulation strips have a cross-sectional form which avoid a surface profile radially with respect to the winding axis, the insulation strips including one of a fiber-reinforced epoxy, polyester resin, or from an unreinforced thermoplastic material. | 11-07-2013 |
20130293340 | TRANSFORMER WINDING - An exemplary transformer winding including at least two hollow-cylindrical, axially adjacent winding modules, which are arranged about a common winding axis and have an electrical conductor wound in layers, and a common electrical insulting layer, through which the winding modules are enveloped. The insulating layer has at least one annular, radial depression or annular, radial elevation, which is salient transversely to the winding axis on the radial outer face of said insulating layer. | 11-07-2013 |
20130300526 | COOLING SYSTEM FOR DRY TRANSFORMERS - The disclosure is related to a dry transformer, which includes a transformer core with at least two parallel limbs and upper and lower yokes, and at least two hollow cylindrical coils, each arranged as neighbored coils around a limb of the at least two parallel limbs. A cooling system can include at least one wall-like diaphragm in-between the neighbored coils, which is in parallel to the orientation of the limbs. | 11-14-2013 |
20140035709 | DRY TRANSFORMER HEATER - A dry-type transformer heater includes a closed housing, and at least one transformer winding arranged in the housing. The at least one transformer winding includes at least one corresponding winding conductor and a corresponding insulation layer surrounding the transformer winding, respectively. In addition to the respective winding conductor, at least one coil heating wire is provided in at least one of the insulation layer and on the surface of the insulation layer to input thermal power into the respective insulation layer. | 02-06-2014 |
20140077913 | SUPPLEMENTARY TRANSFORMER WINDING - A transformer winding and a dry-transformer are disclosed, which include a main transformer winding, and a supplementary transformer winding configured to be electrically connected in series with the main transformer winding. The supplementary transformer winding can include a first winding module, a second winding module, and a third winding module, each of the winding modules having at least a first, a second and a third winding segment, and wherein each of the winding segments has a tap. A changer is configured to be connected to the taps of the second winding module, and wherein the second winding module is configured to be electrically connected in series to at least one winding segment of the first winding module and the third winding module. | 03-20-2014 |
20140077918 | WINDING DEVICE, WINDING METHOD, AND TRANSFORMER WINDING - A transformer winding device, a method and a transformer are disclosed. The transformer winding winding device includes a rotary device configured to extend along an axis of rotation and configured to receive a transformer winding to be wound, at least one device configured to provide a plurality of insulation strips, and a comb-like guide device. The comb-like device is configured to deflect the plurality of insulation strips into at least one common winding plane and fed parallel to one another, at an angle to an axis of rotation, to the transformer winding to be wound. The comb-like guide device can include at least a first guide device element for a first group of insulation strips and a second guide device element for a second group of insulation strips, wherein the first and second guide device elements are offset with respect to one another in terms of axial length. | 03-20-2014 |
20140320253 | TRANSFORMER-CORE - A transformer core is disclosed, which can include at least three hollow-cylindrical rectangular shaped core-discs wound from a magnetic band-like material, wherein two opposed limb areas and an upper and lower yoke area can be formed along a circumferential path. The core-discs can include one first and at least one second slanted area parallel to the circumferential path in the belonging limb area. The at least three core-discs can be connected according to a polygonal layout at their first slanted areas, which can be arranged adjacently face to face. Conical shaped polygonal adapter plates fitted to the polygonal layout within the upper and lower yoke areas, which can be clamped together. | 10-30-2014 |