A transformer and a method of manufacturing a transformer are disclosed. The transformer can include a transformer core with at least three core limbs which are arranged in parallel with respect to one another and perpendicular to corner points of an area spanned by a polygon, and wherein axial end regions of each of the at least three core limbs transition into a respective yoke segment arranged transversely with respect to the axial end regions. Main windings can be arranged around each of the at least three core limbs in a hollow-cylindrical winding region. A magnetic cross section of a respective core limb can be greater than a magnetic cross section of the respective yoke segment. Additional windings can be electrically connected to a respective main winding and can be arranged around each of the respective yoke segments.
1. A transformer, comprising:
a transformer core with at least three core limbs which are arranged in parallel with respect to one another and perpendicular to corner points of an area spanned by a polygon, and wherein axial end regions of each of the at least three core limbs transition into a respective yoke segment arranged transversely with respect to the axial end regions;
main windings arranged around each of the at least three core limbs in a hollow-cylindrical winding region, and wherein a magnetic cross section of a respective core limb is greater than a magnetic cross section of the respective yoke segment; and
additional windings which are electrically connected to a respective main winding and which are arranged around each of the respective yoke segments.
2. The transformer according to claim 1 , wherein the transformer core has an area of an equilateral triangle.
3. The transformer according to claim 1 , wherein the main windings e formed by a respective flat ribbon conductor.
4. The transformer according to claim 1 , wherein the additional windings are formed by a respective flat ribbon conductor.
5. transformer according to claim 1 , wherein the transformer core is a hexaformer core or a delta core.
6. The transformer according to claim 1 , wherein a magnetic cross-sectional area of a respective yoke segment is half the magnetic cross-sectional area of a respective core limb.
7. The transformer according to claim 1 , wherein at least one winding of the additional winding is guided through a gap in the yoke segment.
8. The transformer according to claim 1 , wherein each additional winding is provided with a plurality of taps accessing different turns of the additional winding.
9. The transformer according to claim 8 , comprising:
switching means for electrically connecting each respective main winding to one of the taps of a respective additional winding, and wherein a number of active turns of the respective electrically connected main and additional winding are matched.
10. The transformer according to claim 9 , wherein the switching means comprises:
an on-load tap changer and/or power electronic components.
11. A method of manufacturing a transformer, the method comprising:
providing a transformer core with at least three core limbs which are arranged in parallel with respect to one another and perpendicular to corner points of an area spanned by a polygon, and wherein axial end regions of each of the at least three core limbs transition into a respective yoke segment arranged transversely with respect to the axial end regions;
winding each of the at least three core limbs with a main winding arranged around a respective core limb in a hollow-cylindrical winding region, and wherein a magnetic cross section of a respective core limb is greater than a magnetic cross section of the respective yoke segment; and
electrically connecting additional windings to a respective main winding, the additional windings being arranged around each of the respective yoke segments.
12. The method according to claim 11 , wherein the transformer core has an area of an equilateral triangle.
13. The method according to claim 11 , comprising:
forming the main windings by a respective flat ribbon conductor.
14. The method according to claim 11 , comprising:
forming the additional windings by a respective flat ribbon conductor.
15. The method according to claim 11 wherein the transformer core is a hexaformer core or a delta core.
16. The method according to claim 11 , wherein a magnetic cross-sectional area of a respective yoke segment is half the magnetic cross-sectional area of a respective core limb.
17. The method according to claim 11 , comprising:
guiding at least one winding of the additional winding through a gap in the yoke segment.
18. The method according to claim 11 , comprising:
providing each additional winding with a plurality of taps accessing different turns of the additional winding.
19. The method according to claim 18 , comprising:
switching means for connecting the respective main winding to one of the taps of the respective additional winding, and wherein a number of active turns of the respective electrically connected main and additional winding are matched.
20. The method according to claim 19 , wherein the switching means comprises:
an on-load tap changer and/or power electronic components.