The wound core of the present invention has at least one arbitrary bent region 5A, in a plurality of corner portions (3), in which the corner portion (3) bulges outward to confine the magnetic flux flowing in the wound core so that the angle ? formed by the straight line PQ and the straight line PR satisfies 23????50?.

An object of the present invention is to improve a mechanical strength and to ensure a low magnetic loss without using a supporting member even when amorphous ribbons are used for an inner core. To attain the object, a stationary induction apparatus core of the present invention includes an inner core formed from the amorphous ribbons and outer cores formed from silicon steel sheets, the outer cores being disposed on two sides of the inner core in a depth direction as opposed to a standing direction of the inner core in such a manner as to sandwich the inner core therebetween.

A core for a three-phase transformer is disclosed. The core includes: first, second and third core segments joined together to define three lengthwise extending core legs and first and second core ends disposed generally perpendicularly to the core legs. The core ends are arranged to define a Y shape. Each core segment is formed by nesting together a plurality of magnetic steel strip laminations, the laminations having end sections. The end sections of the laminations overlap such that the ratio of the thickness of the first core end to the thicknesses of the leg thickness is greater that 1:1 and less than 2:1. In one form the ratio of the thickness of the first end to the thicknesses of the leg thickness is 3:2.

A core for an electrical induction device has a plurality of lamination stacks which are each formed by laminated sheets. The lamination stacks lie on top of each other parallel to the layer plane of the laminated sheets. At least one of the lamination stacks is segmented and has at least two partial lamination stacks, the two partial lamination stacks respectively lying opposite each other with their stack end faces standing transverse, in particular perpendicular, to the layer plane of the laminated sheets. The stack end faces of the two partial lamination stacks have a spacing between each other through which a gap is formed extending between the two partial lamination stacks perpendicular to the layer plane. The gap forms a cooling channel or at least a section of a cooling channel, the channel longitudinal extension thereof extending transversely, in particular, perpendicular to the layer plane of the laminated sheets.

An iron core (1, 11, 31) for a stationary induction apparatus according to one embodiment is configured by laminating a plurality of electromagnetic steel plates (5, 16, 33). The electromagnetic steel plates are laminated so that joint parts (6, 17, 18, 32), at which the end portions of the electromagnetic steel plates abut one another, are disposed in a staggered manner; and the electromagnetic steel plates are provided with a magnetic domain fine differentiation processed part (7, 19, 34), which is located on the portion, of a surface of the end portion of each of the electromagnetic steel plates, lapped with the joint part of another electromagnetic steel plate, and which has been subjected to warping-derived magnetic domain fine differentiation.

Cores for electromagnetic devices are discussed. In one example, a core comprises three arc-shaped limbs. Each limb has a first end and a second end, and is arranged around a central axis. The first ends of the limbs are mutually connected at a first position along the central axis, and the second end of the limbs are mutually connected at a second position along the central axis. Each limb comprises a plurality of bent electrical steel strips. Methods for manufacturing such cores are also discussed.

A rolled iron core traction transformer, comprising an iron core (1); the iron core (1) is formed by splicing two symmetrical annealed iron-core closed single frames (1-1); each iron-core closed single frame (1-1) is formed by sequentially coiling continuous silicon steel sheets; the iron-core closed single frame (1-1) has two iron core column single bodies (1-1-1) having approximately semicircular cross sections; the iron core (1) has two iron core columns (1-2) thereon spliced by the iron core column single bodies (1-1-1) and having approximately circular cross sections; each iron core column (1-2) is sequentially provided with a low-voltage T winding (6), a low-voltage F winding (5) and a high-voltage winding (4) thereon from inside to outside; two sides of each high-voltage winding (4) are respectively provided with a first tapping area and a second tapping area; the first tapping area is provided with low-voltage side high-voltage tapping outgoing lines (16); the second lapping area is provided with high-voltage side high-voltage tapping outgoing lines (18); two low-voltage side high-voltage tapping outgoing lines (16) are connected together via a no-load voltage regulation switch (9); and two high-voltage side high-voltage tapping outgoing lines (18) are connected together via another no-load voltage regulation switch (9). The transformer reduces no-load loss, has a small no-load current, low noise and strong anti-short circuit capability, reduces the electrodynamic force generated by a sudden short circuit, and improves the short circuit tolerance capability of the transformer.

A core for an electrical induction device has a plurality of lamination stacks which are each formed by laminated sheets. The lamination stacks lie on top of each other parallel to the layer plane of the laminated sheets. At least one of the lamination stacks is segmented and has at least two partial lamination stacks, the two partial lamination stacks respectively lying opposite each other with their stack end faces standing transverse, in particular perpendicular, to the layer plane of the laminated sheets. The stack end faces of the two partial lamination stacks have a spacing between each other through which a gap is formed extending between the two partial lamination stacks perpendicular to the layer plane. The gap forms a cooling channel or at least a section of a cooling channel, the channel longitudinal extension thereof extending transversely, in particular, perpendicular to the layer plane of the laminated sheets.

The present invention allows individual control of an output voltage of a main transformer and an output voltage of a teaser transformer while utilizing output characteristics of the respective transformer when a Scott connected transformer has control equipment arranged on the input side thereof, including first control equipment arranged in one of two phases of the main transformer on the input side in order to control a voltage or a current and second control equipment arranged in one end of a primary coil of the teaser transformer on the input side in order to control a voltage or a current, the control equipment controlling an output voltage of the main transformer and an output voltage of the teaser transformer individually.

The present invention allows individual control of an output voltage of a main transformer and an output voltage of a teaser transformer while utilizing output characteristics of the respective transformer when a Scott connected transformer has control equipment arranged on the input side thereof, including first control equipment arranged in one of two phases of the main transformer on the input side in order to control a voltage or a current and second control equipment arranged in one end of a primary coil of the teaser transformer on the input side in order to control a voltage or a current, the control equipment controlling an output voltage of the main transformer and an output voltage of the teaser transformer individually.