Hitachi Energy Ltd

Anders Daneryd

Kiran Chandra Sahu

Manoj Pradhan

Göran Eriksson

Seyed Ali Mousavi

A transformer comprising at least two phase windings, each phase winding having coil turns around a coil axis, wherein the at least two phase windings comprise at least a first type of phase winding and a second type of phase winding, each of the first type of phase winding and the second type of phase winding comprising a plurality of winding portions comprising at least a first winding portion and a second winding portion, the first type of phase winding comprising a first winding portion having a first winding portion stiffness and a second winding portion having a second winding portion stiffness, and characterized in that a stiffness difference between said first winding portion stiffness and said second winding portion stiffness of said first type of phase winding is such that the acoustic power is minimized at said main frequency.

Transformer and a transformer arrangement

A transformer comprising a core and winding wound around a winding axis extending along a limb of the core, said winding terminating in an axial end surface extending in a direction perpendicular to said winding axis, said transformer comprising a ring comprising magnetic material, said ring being located outside said winding and adjacent to said axial end surface. The ring comprises a set of magnetic metal components, such as magnetic metal sheets, said magnetic metal components being distributed about the winding axis and electrically insulated from each other. The core comprises a yoke, said yoke extending radially across the ring, at one or more crossing locations, from a radial inside of the ring to a radial outside of the ring. The cross-sectional height of the ring varies about the winding axis such that magnetic metal components at the crossing locations have lower height along the winding axis than magnetic metal components further away from the crossing locations.

Transformer comprising winding

A winding for a phase winding of a transformer. The winding has coil turns around a coil axis. The winding is adapted to transform voltage in a transformer at a predetermined frequency, when the transformer is operating. The winding is excited by a mechanical load having a main frequency corresponding to the predetermined frequency multiplied by two and has vibration modes. The combination of load and vibration modes results in a vibration of the winding. The winding has a set of vibration modes. Each vibration mode has a vibration mode frequency, wherein a main contributing vibration mode of the set of vibration modes is the vibration mode resulting in the largest acoustic power of the vibration modes. The winding is excited by the load and a stiffness difference between a first winding portion stiffness and a second winding portion stiffness is such that the acoustic power is minimized at said main frequency.

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Västerås, Sweden

Anders Daneryd