Abstract:
The invention is related to a transformer core (30, 50, 80, 100, 110), comprising at least three hollow-cylindrical rectangular shaped core-discs (10, 42, 44, 46, 52, 54, 56, 82, 84, 102, 104, 112) wound from a magnetic band-like material (12, 14, 16), wherein two opposed limb areas (20, 22) and an upper (24) and lower (26) yoke area are formed along a circumferential path (18a, 18b, 18c, 18d). The core-discs (10, 42, 44, 46, 52, 54, 56, 82, 84, 102, 104, 112) comprise one first (60, 64, 90, 94) and at least one second (58, 62, 86) slanted area parallel to the circumferential path (18a, 18b, 18c, 18d) in the belonging limb (20, 22) area. The at least three core-discs (10, 42, 44, 46, 52, 54, 56, 82, 84, 102, 104, 112) are connected according to a polygonal layout (48) at their belonging first slanted areas (60, 64, 90, 94), which are arranged adjacently face to face. At least one flat plate (66, 68, 88, 92, 106) is foreseen in each limb area (20, 22), which is connected even and stiff with a belonging adjacent slanted area (58, 60, 62, 64, 86, 90, 94).
Abstract:
Die Erfindung betrifft einen Transformator in Trockenbauweise mit einem Kern aus amorphem Material, welches empfindlich gegen mechanische Beanspruchungen ist, mit wenigstens einem den Kern umgebenden, aus wenigstens je einer Primärwicklung und Sekundärwicklung gebildeten Wicklungskörper sowie mit wenigstens einer Haltevorrichtung, sowie ein Verfahren zu dessen Herstellung, wobei die Haltevorrichtung zur Fixierung der wenigstens je einen Primärwicklung und Sekundärwicklung dient und hierzu den wenigstens einen Wicklungskörper jeweils an dessen Stirnseiten beaufschlagt.
Abstract:
The invention is related to an on-load tap-changer (10, 40, 60, 80) for dry transformers, comprising an electric insulating hollow casing (12, 62) extending around a virtual axis (14, 70), wherein several electric contact sections (16, 18, 20, 22) are foreseen along the inner surface of the hollow casing (12, 62), which are electrically joined through the wall of the hollow casing (12, 62) and a selector contact in the inner of the casing which is rotatable around the virtual axis and that's radial outer end is selectively connectable with one of the contact sections by a respective rotation. The inner space (30) of the hollow casing (12, 62) is hermetically sealed and filled with a preferably pressured insulating gas. The invention is also related to a transformer with an on-load tap-changer (10, 40, 60, 80).
Abstract:
Die Erfindung betrifft eine Trockentransformatorspule (10, 32, 34, 36, 52, 54, 56), umfassend eine hohlzylindrische Spule mit wenigstens einer radial innen (12) liegenden und einer radial außen (14) liegenden Wicklung. An der radial äußeren Oberfläche der Spule ist eine zumindest teilweise umlaufende und sich wenigstens über deren axiale Länge erstreckende Barrierenstruktur mit wenigstens einer Lage Leisten (16) aus einem isolierenden Material und wenigstens einer radial von diesen abgestützten Barrierewandung (18) vorgesehen, wobei die radial äußerste Barrierewandung (18) einen elektrischen Schirm (20, 42, 58, 60, 62) aufweist. Die Erfindung betrifft auch einen Trockentransformator, umfassend einen Transformatorkern mit wenigstens zwei Kernschenkeln, wobei um jeden der wenigstens zwei Kernschenkel (26) eine erfindungsgemäße Trockentransformatorspule (10, 32, 34, 36, 52, 54, 56) angeordnet, deren jeweiliger elektrischer Schirm (20, 42, 58, 60, 62) mit Erdpotential (24, 44, 64) verbunden ist.
Abstract:
The present invention relates to an active part of a dry-type distribution transformer having an insulation system with electrical field control. An active part of the dry transformer comprising a core (1) with yokes (2) and limbs (3) having an a longitudinal axis (A) around which LV coils (4) and winding bobbin (5) is placed concentrically. The bobbin (5) has a shape of a longitudinal cylinder (5a) which is ended with annular discs (5b). The bobbin (5) is made of material having a dielectric permittivity which is two to five times higher more the dielectric permittivity of the insulating body (8) surrounding the limb (3) around the axis (A), in which the LV coils (4) and HV coils (6) are embedded. The external facial surfaces of the insulating body (8) is provided with a metallic layer (10) having such electric conductivity that the part of the insulating body (8) between an internal surface of the metallic layer (10) and an external surface of the annular disc (5b) has a thickness (d3) which is sufficient for insulation. A side surface of the cylinder (5a) is covered with a resistive layer (7) being a control shield of an electric field around the limb (3) of the core (1) and the HV coils (6) and the LV coils (4).
Abstract:
Die Erfindung betrifft einen Kern-Ring (2) eines Transformators (1) oder einer Drossel, welche(r) als Wickelbandkern aus einem Band gebildet ist, wobei zwischen Unterseite (3) und Oberseite (4) des Kern-Rings (2) ein über die gesamte Schichthöhe verlaufender Schnitt (6 - 14, 16 - 25) unter einem ersten Winkel α zur Oberfläche des Bandes und einem zweiten Winkel ß zur Stirnfläche des Kern-Rings (2) eingebracht ist.
Abstract:
The invention relates to a method for manufacture of a transformer core made of ferromagnetic material, such as amorphous metal or silicon iron, which is provided as a single ribbon layer or as multiple ribbon layers, characterized by the following steps : a) the single ribbon layers or bundle of ribbon layers of ferromagnetic material, such as amorphous metal or silicon iron, are continuously wound into loops, whereas the shape of the core loops is effected by means of an appropriate mandrel to be directly formed into its final shape; b) the single or multiple ribbon layers of the loops are being cut in that - a mechanical device or a laser is used for cutting, allowing fast and precise cutting of the ribbons, and in that - all ribbons of the loops are cut at at least one position along the circumference of each ribbon layer. Furthermore the invention relates to a method of manufacture of a transformer having a core manufactured according to the method being illustrated before as well as to a transformer provided with such a core manufactured according to the claimed method.
Abstract:
The invention relates to a three-phase high performance dry- type transformer (10) with epoxy insulated coils (12, 14, 16) having a triangular core (20) formed by three core legs linked together by an upper yoke (18) and a lower yoke, each coil wound around its own core leg and provided with reinforcing fibres and cast resin. Furthermore it relates to a method for manufacturing same where a lower yoke is connected with core legs, each core leg is provided with a winding of copper wire, each winding is laminated with reinforcing fibres, rovings, or prepregs made thereof, in each winding a tube like body is fitted in order to form a channel for discharging heat losses during operation, and each coil is provided with cast resin. Each coil is then shifted on the respective core leg, the upper yoke is connected to the core legs, and the electrical installation of the conductors of each coil is finalized.
Abstract:
Trockentransformatorkern für einen Trockentransformator (34), mit einem amorphes Material (14) aufweisenden Transformatorkern (10, 32, 46), welcher auf seiner Oberfläche mindestens teilweise eine Kapselung (36) zum Schutz vor Umwelteinflüssen, wie Feuchtigkeit und Oxidation, aufweist.
Abstract:
Es wird ein Verfahren zur Herstellung einer Kern/Spulen-Konfiguration eines Transformators oder einer Drosselspule vorgeschlagen, welches dadurch gekennzeichnet ist, dass in einem ersten Schritt zur Bildung von Vormontageeinheiten (6, 7, 8, 9) ein kompressibles Abstützmaterial (4) in einen starren Rahmen (5) eingedrückt wird, wobei die Seitenschenkellänge (a) des Abstützmaterials (4) dem definierten gewünschten Abstand zwischen Kern (2) und Spule (3) entspricht und die Seitenschenkellänge (b) des Rahmens (5) kleiner als die Seitenschenkellänge des Abstützmaterials (4) ist, dass in einem zweiten Schritt die Vormontageeinheiten (6, 7, 8, 9) zwischen Kern (2) und Spule (3) eingebracht werden und dass in einem dritten Schritt der starre Rahmen (5) vom Abstützmaterial (4) entfernt wird, so dass Abstützungen (10, 11, 12, 13) zwischen Kern (2) und Spule (3) gebildet werden.