Abstract: A high power static electromagnetic device with a flux path, a main winding and one or more regulation windings surrounding portions of the flux path. A control device is coupled to the flux path for selectively admitting the flux therein. In an exemplary embodiment, multiple flux paths are selectively turned on and off for including and excluding the regulation windings from the circuit. The windings may be formed of a magnetically permeable, field-confining insulating cable.

Abstract: A rotating electric machine for direct connection to all types of high-voltage networks, in which the magnetic circuit adapted for high voltage comprises a rotor, stator and windings. The winding comprising a conductor surrounded by a solid insulation system. The invention also relates to a method for manufacturing the same.

Abstract: For a method of operating of a synchronous compensator including a rotating electric machine including a rotor and a stator with at least one winding with a solid insulation enclosing the electric field, relevant parameters for temperature conditions in the rotor are determined, and during over-excited operation, to temporarily enlarge the field of operation of the synchronous compensator, cooling of the rotor is forced depending on a rotor temperature value determined from the parameters. The synchronous compensator measures parameters relevant for the temperature conditions of the rotor. A mechanism is also provided to force the cooling of the rotor depending on rotor temperature values determined from the parameters during over-excited operation of the electric machine.

Abstract: A rotating electric machine for direct connection to all types of high-voltage networks, in which the magnetic circuit adapted for high voltage comprises a rotor, stator and windings. The winding comprising a conductor surrounded by a solid insulation system. The invention also relates to a method for manufacturing the same.

Abstract: A high power static electromagnetic device with variable inductance has a magnetic circuit with a flux bearing region. A main winding and at least one control winding surrounds the portions of the flux bearing region. A control device is coupled to the control winding for varying the distribution of flux. The winding is formed of a magnetically permeable, field-confining insulating cable.

Abstract: The invention relates to a rotating electric machine comprising a stator (4) provided with windings drawn through slots in the stator, and a rotor (1) having a central axis (2) and poles (5, 6) in the form of pole pieces (8, 9) provided with windings and forming solenoids, pole gaps (13) being arranged between the poles. The machine also comprises coil supports (15, 16) in said pole gaps in order to support the solenoid windings (10, 11). It is characterized in that the coil supports (15, 16) are arranged in pairs and that each coil supports (15, 16) is shaped so that it supports only a part of the solenoid windings (10, 11) of the two adjacent poles (5, 6).

Abstract: For a method of operating of a synchronous compensator comprising a rotating electric machine comprising rotor (46) and stator (2) with at least one winding with a solid insulation enclosing the electric field, relevant parameters for the temperature conditions in the rotor are determined, and during over-excited operation in order to temporarily enlarge the field of operation of the synchronous compensator, the cooling of the rotor is forced depending on a rotor temperature value (TR) determined from said parameters. Such a synchronous compensator comprises measuring means for measuring parameters relevant for the temperature conditions of the rotor. Means (36, 38) are also provided to force the cooling of the rotor (46) depending on rotor temperature values (TR) determined from said parameters during over-excited operation of the electric machine.

Abstract: An insulated conductor for high-voltage windings and electric machine, and rotating electric machine that use the insulated conductor. The insulated conductor is suitable for use in a high-voltage winding application for devices such as an electric machine and a rotating electric machine. A feature of the insulated conductor is that the conductor includes at least one strand, and an inner conductive layer that surrounds the at least one strand. An insulating layer surrounds the inner conductive layer, and an outer conductive layer surrounds the insulating layer. When arranged in this manner, and when the outer conductive layer is suitably configured to provide an equipotential surface, the insulated conductor provides relatively high resistance to breakdown when operating at high voltages.

Abstract: A high voltage power cable termination with a current lead, a power cable having a first tube and an outer conductor, e.g., a superconductor, whose electrically conducting properties improve at low temperatures, arranged around the first tube and intended in use to be cooled to low temperatures by cryogenic fluid flowing through the first tube, a joint for electrically connecting one end of the current lead to the conductor at one end of the cable at or adjacent to one of the first tube, and a second tube communicating with the first tube at or adjacent to the joint for conveying cryogenic fluid to or from the first tube. The first and the second tube are arranged so that, in use, no cryogenic fluid conveyed by the tubes contacts the conductor or the current lead at the joint. The invention also relates to electrical apparatus, e.g., a high voltage induction device, having such a termination.

Abstract: A device for mechanically securing and controlling the potential of winding cables (10) outer semiconducting layers (14) in the end windings region of the stator (2) of a rotating high-voltage electric machine comprises spacers (12) of resilient, electrically conducting material arranged between the semi-conducting outer layers (14) of adjacent winding cables (10, 10′, 10″) Positioning devices (16, 18) are arranged to secure the cables in relation to each other with the outer layers in contact with the spacers.

Abstract: A device for avoiding wear between the cables in coilend packages on the stator (1) in a rotating electric machine comprises a resilient layer (10) in the contact area between two cables (4). The cables (4) are mutually secured by a securing device (12). The resilient layer (10) permits a certain relative movement between the cable (4) due to skewing of the resilient material and not due to sliding in the contact area.

Abstract: The present invention relates to a stator for a rotating electric machine, comprising a stator, with a stator core and a winding, and a rotor, wherein said stator core is provided with stator teeth extending radially inwards, towards said rotor, characterized in that each stator tooth (3) is configured as a number of tooth sections (7) joined axially into a stator tooth plank (2) and that a number of stator tooth planks are fitted together side by side thus forming a section (1A, 1B, 1C, 1D; 31, 32, 33, 34) of a stator core or a complete stator core. The invention also relates to a corresponding method for use in the manufacturing of a stator, and a rotating electric machine including such a stator.

Abstract: In the stator winding in a rotating electric machine the winding is situated in radial slots (111) in the stator (106). According to the invention the winding consists of a cable which forms layers at different radial distances from the air gap (108) between the rotor (107) and the stator (106). The part of the cable (101) that passes to and fro once through the stator between different layers forms a coil (113) with an arcshaped coil end protruding from each end surface (114) of the stator (106). The coils (113) are divided into coil group parts. All coils (113) in the same coil group part are arranged axially, one outside the other with substantially coinciding centres and with successively increasing diameters. The number of slots (111) that are bridged by the coils (113) successively increases within the coil group part.

Abstract: A method and device for providing series compensation for rotating electric alternating current machines connected either directly, or via a static current converter, to a three-phase distribution or transmission network. The stator of the electric machine is Y-connected. A capacitive circuit for the fundamental frequency of the voltage is connected to each phase between the low voltage side of the winding and a ground of the transmission network.

Abstract: The invention relates to a rotating electric machine comprising a stator (4) provided with windings drawn through slots in the stator, and a rotor (1) having a central axis (2) and poles (5, 6) in the form of pole pieces (8, 9) provided with windings and forming solenoids, pole gaps (13) being arranged between the poles. The machine also comprises coil supports (15, 16) in said pole gaps in order to support the solenoid windings (10, 11). It is characterized in that the coil supports (15, 16) are arranged in pairs and that each coil support (15, 16) is shaped so that it supports only a part of the solenoid windings (10, 11) of the two adjacent poles (5, 6).

Abstract: A rotating electric machine, comprising a stator (1) wound with high voltage cable and provided with stator teeth (4) extending radially inwards from an outer yoke portion (23), wherein at least one stator tooth (4) in a tooth sector (18) is provided with at least one axially running cooling duct (24) connected to a cooling circuit (25) in which coolant is arranged to circulate and in that the axially running cooling tube (24) is connected at least at one end of the stator (1) to a clamping means (27, 28) for axial compression of the stator (1).

Abstract: In a method for mounting a cable winding, cable by cable, on a stator (S) for a generator a number of cables (K) of predetermined lengths are used for the intended winding. The method implies mounting each such cable starting at the stator slot representing the middle of an intended coil arc, the first cable half being mounted according to a winding diagram in one direction from the said center slot and other cable half being mounted according to the winding diagram in the opposite direction starting from the same center slot. The method is carried out by means of a device comprising a drum means, for instance in the form of a capstan machine (2), which originally supports the entire predetermined cable length of a cable. Further, there are two cable feeders (A, B) disposed on either side of the stator (S), which alternatively lay the cable (k) in the stator slots according to the winding diagram by means of intermediate storage means (3, 4).

Abstract: An electrode for control of an electric field strength in a gaseous electrically insulating medium at the surface of the electrode and in the vicinity of the electrode, comprising an electrically conducting inner electrode (1′) and an electrically non-conducting layer (8) on at least parts of the surface of the inner electrode, wherein the thickness of the non-conducting layer is at least 5% of the mean diameter of the inner electrode and that the relative dielectric constant of the non-conducting layer is smaller than 3.

Abstract: The present invention relates to a mounting device (80) for reducing short-circuiting forces that are transmitted from a stator core to a stator body in a rotating electric machine comprising a stator with windings drawn through slots in the stator, wherein the stator core is composed of a number of packs (82), each of which includes a number of metal sheets, or of a number of metal sheets, each pack (82) or metal sheet having two identical grooves (84) arranged for cooperation with wedge members (86) designed to join together packs (82) or metal sheets, and wherein the stator body comprises beams (88), each connected to a wedge member (86). The mounting device (80) also comprises a connector (90) arranged through the beam (88) and secured in the wedge member (86) in order to connect the beam (88) and wedge member (86) in such a manner as to permit sliding between the wedge member (86) and the beam (88) in the event of short-circuiting. The windings also consist of high-voltage cable (10).

Abstract: An insulated conductor for high-voltage windings in electric machines employs conductor formed of one or more strands, an inner, first semi-conductive layer surrounding the strands, a first insulating layer surrounding the inner, first semi-conductive layer and an outer, second semi-conductive layer surrounding the first insulating layer. The second semi-conductive layer has at least two different earth points along the insulated conductor, the second semi-conductive layer has breaks located between consecutive earth points. A shielding device is located in each of said breaks for reducing amplification of the electric field strength produced at the breaks.