公开(公告)号：US20220005643A1

公开(公告)日：2022-01-06

申请号：US17289927

申请日：2019-10-30

Applicant: ABB POWER GRIDS SWITZERLAND AG

Inventor： Thomas GRADINGER ,  Uwe Drofenik

IPC: H01F27/28 ,  H01F27/34 ,  H01F41/066

Abstract: A transformer includes a first winding arranged around an axis, and a second winding arranged around the axis. The second winding includes a litz wire having an end portion located at an axial end position of the second winding and a middle portion located at an axial middle position of the second winding. The litz wire has a first cross section at the end portion and a second cross section at the middle portion, the cross sections each including in a quadrant between the axial outward direction and the direction pointing towards the first winding a curvature extending between the axial outward direction and the direction pointing towards the first winding. The curvature of the first cross section is smaller than the curvature of the second cross section thereby reducing the peak magnitude of the electrical field between the end portion of the second winding and the first winding.

公开(公告)号：US20210391117A1

公开(公告)日：2021-12-16

申请号：US17279611

申请日：2019-09-24

Applicant: ABB Power Grids Switzerland AG

Inventor： Uwe Drofenik ,  Thomas Gradinger

IPC: H01F27/32 ,  H01F27/24 ,  H01F41/066 ,  H01F41/12 ,  H01F41/00

Abstract: A transformer is described. The transformer includes a transformer core having a core leg having a longitudinal axis, a low voltage winding arranged around the core leg, the low voltage winding extending along a first length in the direction of the longitudinal axis, a high voltage winding arranged around the low voltage winding, the high voltage winding extending along a second length in the direction of the longitudinal axis, wherein the second length is shorter than the first length, and a casting embedding the low voltage winding and the high voltage winding. The casting has a recess. The recess is provided at a radial location of the high voltage winding and the recess extends in the direction of the longitudinal axis.