Abstract: A transformer for a welding gun has a reduced resistance and reactance thus drawing less current. The transformer is of substantially reduced weight and may be operated at high duty cycles and in a welding gun performing a large number of welds per hour. The transformer is formed of a hollow coil and coolant is flowed through the coil to directly cool the primary. The secondary is electrically insulated from the primary but physically adjacent the primary so that heat from the secondary is dissipated through the primary to the contact.

Abstract: Transformer, including an iron core, high voltage and low voltage windings, at least one cast resin body completely embedding, holding and insulating the windings, the cast resin body having cooling channels formed therein and having additional channels formed therein being separated from the cooling channels, and insulating gas filling the additional channels.

Abstract: A disc coil winding of interwound coils is formed of winding conductors covered with normal insulation, the winding having a radially inner and a radially outer surface. A plurality of the coils are disposed at an input to the winding, and have respective turns thereof located at the inner and the outer surface of the winding as well as respective turns thereof located radially adjacent thereto. Supplemental insulations are provided for reinforcing the normal insulation, the supplemental insulations extending from respective starting locations both between the turn located at the inner surface and the turn adjacent thereto as well as between the turn located at the outer surface and the turn adjacent thereto for protecting at least one edge of the respective turns. The coils have a turn capacitance between respective turns thereof free of the supplemental insulations which is greater than the turn capacitance between the respective turns thereof provided with the supplemental insulations.

Abstract: An electrical shunt reactor coil comprises a rectangular magnetic frame in the form of two vertical members (1,2) interconnected at their ends by two horizontal yoke members (3,4). The frame members are constituted by respective stacks of magnetic laminations. A central core (7) extends across the middle of the frame parallel to the vertical members, and an electrical winding (6) is situated around the core. The horizontal yoke members are of width L which is less than the diameter of the winding and which is close or equal to the diameter of the central core. Magnetic shunts (20 to 23) are placed across the outside of the horizontal yoke members. The shunts are longer than the width L of the yoke members so that they overhang both sides thereof. The magnetic shunts are constituted by respective stacks of laminations extending parallel to the axis of the central core and at right angles to the laminations of the yoke members.

Abstract: This invention relates to improvements in a transformer apparatus in which a transformer unit insulated with insulating oil and a switch unit insulated with insulating gas are combined. The transformer unit is accommodated in a transformer tank filled with the insulating oil. The switch unit is accommodated in a switch tank filled with the insulating gas. The switch tank is disposed on the top of the transformer unit and made integral therewith such that these tanks are communicated with each other in the interior of the communicated tanks.

Abstract: Membrane switch assembly comprises a substrate, a membrane, and a separator between the opposed surfaces of the substrate and membrane. Opposed switch electrodes are provided on the opposed surfaces and circuit conductors are provided which extend between and among the electrodes. The assembly has a composite tail made up of a substrate tail section and a membrane tail section. The two tail sections are co-extensive and parallel. Substrate leads extend from the substrate onto the substrate tail section and membrane leads extend from the membrane onto the membrane tail section, the leads being parallel and offset from each other. Portions of the substrate tail section extend through slots in the membrane tail section and portions of the membrane tail section extend through slots in the substrate tail section.

Abstract: A shielded transformer of the type particularly used as an isolation transformer, has a greatly reduced interwinding capacitance. Metallic overlap is provided, completely across a juncture of the metallic shield with faces of the windows in the core, and completely across a juncture of the metallic shield with the metallic case. This metallic overlap is tolerant to misalignments and variations in fit, completely eliminating gaps that cannot be economically made small with the butt joint of present art. The overlap comprises grooves in faces of the window or in the case. In a second embodiment, the overlap comprises grooves in channels on faces of the window and on the case. The shield fits into the grooves.

Abstract: An a-c current sensor for measuring the current which flows in a conductor has an insulating frame having a central compartment open at its upper end and encompassed by a U-shaped receptacle for a bent portion of the conductor. A coil is housed in the central compartment. The frame is slidingly mounted within a sleeve made of a soft magnetic material and having two assembled half-shells. The voltage generated by the current across the coil is proportional to the intensity of current flow.

Abstract: A field coil insulation shield for a motor or generator is made of a single sheet of insulating material, and defines portions which substitute for the paper insulator conventionally disposed around a field pole and between a field coil and a motor frame, and portions which substitute for individual wrappings with tape to form the field coil and to protect it from the structure of the field pole which holds it in position. The portions which substitute for a wrapping of tape are provided with elongated projections which are latchingly received around the edge of a central aperture, through which the field pole passes.

Abstract: Transformer, including copper windings, electrical insulation for the windings, the electrical insulation being formed of sections of solid and liquid insulating material, the liquid insulating material serving as a cooling liquid containing a chemical compound from the class of N,N'-dihydrazides as a copper deactivator in a cooling liquid flow, and a supply depot disposed in the cooling liquid flow containing the copper deactivator as a solid material.

Abstract: Conductor bundles for the concentric coils of a dry inductor having no iron core. The coils define cooling air gaps therebetween, adjacent ones of the coils being electrically connected in parallel and each coil being comprised of turns of a conductor bundle of the same rectangular cross section, the coils having different numbers of said turns. The conductor bundles form the turns of the coils and comprise a plurality of conductors electrically insulated from each other and twisted together, the conductor bundles of all coils are structurally identical with respect to the number and cross-sectional dimension of the conductors, and the rectangular cross sections of the conductor bundles forming respective coils have different cross-sectional dimensions in the axial direction of the respective coil whereby the coils have the same dimension in said axial direction while the number of the turns of the coils differs.

Abstract: A current transformer having at least one ring-shaped core with a secondary winding mounted thereon, and a primary conductor, located within its casing. An inner tube is provided between the ring-shaped core and the primary conductor, one end of the tube being electrically connected to the casing and its other parts electrically insulated therefrom. A cylindrical, electrically conductive screening shield at least partially overlaps the inner tube and is electrically connected to the casing on the side of the ring-shaped core which is distal from the electrical connection between the casing and the inner tube, while the other parts of the shield are electrically insulated from the casing. This overlap forms a short-circuit loop for any steep progressing wave which is generated when switching on a potential-free part of the circuitry, or when due to an interruption, a small capacitive current breaks off.

Abstract: A current transformer including a tubular electrically conducting member of a circular cross section connected to one end of a primary winding in the form of a tubular electrically conducting coil having a single turn, a cruciform conducting member coaxially disposed within the tubular member to be connected to the other end of the coil, and a hollow cylindrical dielectric member coaxially disposed within the tubular member to form an incoming and an outgoing flow path between the tubular and dielectric members and between the dielectric and cruciform members, respectively. The tubular coil and the tubular member are wrapped in an insulating member and a secondary winding is wound around the primary winding through the insulating member. The transformer is immersed in a dielectric fluid a part of which fills the two flow paths and the interior of the primary winding communicating with them.

Abstract: A position-measuring transformer having a pair of confronting relatively movable supports (12, 14) upon the confronting faces (16, 18) of which lie patterns of conductors is disclosed (26, 50). The conductors (26, 50) on the respective supports (12, 14) are dimensioned, configured, and positioned in such a way that portions of the conductors of one support confront portions of the conductors of the other support. When the conductors of one support are energized, a coupling effect is produced in the conductors of the other support. This coupling effect varies as a function of the relative position of the conductors, i.e., the relative position of the support. The energized conductors comprise a pattern of strip-like conductors (30, 88, 116) placed side by side. The conductors in which the coupling effect is produced are of two configurations. The "fine data" pattern comprises strip-like conductors (116) placed side by side in a pattern similar to that of the energized conductors (30).

Abstract: A device for introducing an anti-microphony sponge into an air-cored coil for television channel selectors, comprising an axially displaceable hollow mandrel with an end portion which comprises two diametrically oppositely situated slots. Two blocking members can be introduced into the slots, after which cutting means are displaceable in a direction transversely of the axis of the mandrel. After the introduction of a length of spongy material into the mandrel, an air-cored coil is arranged on the end portion of the mandrel, after which the blocking members are moved into the slots so that the length of spongy material is clamped on both sides of the air-cored coil. Subsequently, the mandrel is withdrawn from the coil and the length of spongy material is cut in the zone between the blocking means and the withdrawn mandrel so that a piece of spongy material is left behind in the air-cored coil.

Abstract: A high voltage reactor includes a plurality of angularly spaced columns for supporting the layers of a disk winding in vertically spaced relation. Each of the columns is comprised of a monolithic casting of an insulative material and pairs of angularly spaced, rigid plastic casting forms disposed between each winding layer. The form pairs are in vertical alignment to establish requisite layer-to-layer and turn-to-turn separations, as well as to provide the sidewalls of a casting mold utilized in forming the column. The forms thereafter remain in place to constitute the column sidewalls.

Abstract: A power transformer characterized by inner and outer low voltage winding sections and a high voltage winding section disposed therebetween. The low voltage windings are comprised of a plurality of pancake coils, and the high voltage winding are comprised of a plurality of conductor strands spirally wound for a plurality of coil layers. The low and high voltage winding sections are laterally spaced with the low voltage windings disposed in side-by-side positions and adjacent to the high voltage windings. The high voltage windings having a smaller turn height than the low voltage windings and having conductor strands of smaller gauge than the pancake coils of the low voltage windings.

Abstract: A transformer including a lamination core of band iron and a magnetic screen which consists of a wound iron band arranged around the lamination core (5) and which is secured to the core by means of expansion wedges provided in the space between the core and the screen 13. The expansion wedges (7) extend transversely of or at an angle with respect to the winding direction of the wound iron band.

Abstract: A toroidal transformer is provided with an inner winding electrostatic shield formed by bringing together two conductive annular cups having a generally U-shaped radial cross section. The widths and radii of the sidewalls of these cups are dimensioned such that one of the sidewalls of the first cup forms a conductive interference fit with the corresponding sidewall of the second cup, while the other sidewall of the first cup is separated from the corresponding sidewall of the second cup by a gap, which prevents the shield from becoming a shorted turn. The shield formed by these two cups is placed around a wound core and a second winding is wound over the shield to form a transformer.

Abstract: In a high power density transformer composed of a core and a coil assembly unit (or two such units), with the coil assembly unit including a primary winding, a secondary winding, a coil carrier supporting the windings, an insulating system, and a metal shield between the primary and secondary windings which is in electrically and thermally conductive connection with a metal grounding structure so that the metal grounding structure constitutes a support for the coil assembly, the metal shield serves as the coil carrier which is disposed directly on the metal grounding structure.