Abstract: The present disclosure relates to a cable for a high voltage winding of an electromagnetic induction device. The cable includes a conductor having a width w, and a shield arranged around at least a portion of the conductor, wherein in any cross-section of the conductor the conductor has rounded corners with a radius r in the range w/5<r?w/3. A high voltage electromagnetic induction device having a cable forming a high voltage winding is also disclosed.

Abstract: The present disclosure relates to a cable for a high voltage winding of an electromagnetic induction device. The cable includes a conductor having a width w, and a shield arranged around at least a portion of the conductor, wherein in any cross-section of the conductor the conductor has rounded corners with a radius r in the range w/5<r?w/3. A high voltage electromagnetic induction device having a cable forming a high voltage winding is also disclosed.

Abstract: A method and a device for estimating the winding clamping force on a winding package of a transformer or a reactor, the winding package comprising at least one winding with connections and an iron core. The device includes a current pulse generator configured to generate a current pulse sufficient to excite the winding, means for supplying the current pulse to the winding, a sensor for measuring vibrations of the transformer or the reactor generated by the current pulse, and a computing unit configured to calculate a mechanical resonant frequency based on the measured vibrations and to estimate the clamping forces on the winding packages based on the calculated mechanical resonant frequency and a predetermined relation between the expected mechanical resonant frequency and the clamping force.

Abstract: A method and a device for estimating the winding clamping force on a winding package of a transformer or a reactor, the winding package comprising at least one winding with connections and an iron core. The device includes a current pulse generator configured to generate a current pulse sufficient to excite the winding, means for supplying the current pulse to the winding, a sensor for measuring vibrations of the transformer or the reactor generated by the current pulse, and a computing unit configured to calculate a mechanical resonant frequency based on the measured vibrations and to estimate the clamping forces on the winding packages based on the calculated mechanical resonant frequency and a predetermined relation between the expected mechanical resonant frequency and the clamping force.

Abstract: An induction winding (20) consisting of at least one turn, containing current-carrying means (10) comprising stranded conductors (11) arranged in at least one layer (12, 13, 14) where the said at least one layer is electrically insulated from adjacent layers (16, 17, 18) and at least two adjacent strands constituting the said at least one layer are uninsulated.