Cooling system for dry transformers
View Patent ↗The disclosure is related to a dry transformer, which includes a transformer core with at least two parallel limbs and upper and lower yokes, and at least two hollow cylindrical coils, each arranged as neighbored coils around a limb of the at least two parallel limbs. A cooling system can include at least one wall-like diaphragm in-between the neighbored coils, which is in parallel to the orientation of the limbs.
1. Dry transformer, comprising:
a transformer core with at least three parallel limbs and upper and lower yokes;
at least three hollow cylindrical coils, each arranged as neighbored coils around a limb of the at least three parallel limbs;
a cooling system having at least one wall-like diaphragm in-between the neighbored coils which are configured in parallel to an orientation of the at least three parallel limbs;
wherein the at least three parallel limbs are arranged polygonally around a virtual center axis parallel thereto; and
wherein the diaphragms are connected in a region around the virtual center axis forming a star-like cooling module, and wherein the star-like cooling module comprises:
a chimney around the virtual center axis, which forms an inner cooling channel.
2. Dry transformer according to claim 1 , wherein the at least three parallel limbs are three limbs configured in a triangular shape.
3. Dry transformer according to claim 1 , comprising:
ribs and/or fins, on a surface of the at least one wall-like diaphragm.
4. Dry transformer according to claim 1 , wherein the at least one wall-like diaphragm has a convex shape, which is adapted to an outer shape of neighboring coils.
5. Dry transformer according to claim 1 , wherein the at least one wall-like diaphragm is made at least in part from a metal.
6. Dry transformer according to claim 1 , wherein the at least one wall-like diaphragm is made at least in part from a dielectric material.
7. Dry transformer according to claim 1 , comprising:
a thermoconducting connection between the at least one wall-like diaphragm and at least one part of the transformer core.
8. Dry transformer according to claim 7 , wherein the thermoconducting connection comprises:
slitted sleeves surrounding a yoke.
9. Dry transformer according to claim 1 , wherein the wall-like diaphragms have a height, which corresponds to at least an axial height of the cylindrical coils.
10. Dry transformer according to claim 1 , wherein the cylindrical coils and the wall-like diaphragms are oriented vertically.
11. Dry transformer according to claim 1 , wherein the wall-like diaphragms are heat absorbing and are black in color.
12. Dry transformer according to claim 1 , wherein the wall-like diaphragms are made of a material having thermoconducting characteristics.
13. Dry transformer according to claim 1 , wherein the at least three parallel limbs are three limbs configured in a triangular shape, and the wall-like diaphragms are three symmetrically arranged wall-like diaphragms, which are arranged at an angle of 120 degrees to one another.
14. Dry transformer, comprising:
a transformer core with three parallel limbs and belonging upper and lower yokes, wherein the parallel limbs are arranged triangular around a virtual center axis parallel thereto;
three hollow cylindrical coils, each of the three hollow cylindrical coils arranged around a limb;
a cooling system comprising a wall-like diaphragm in between each neighbored coils, which is in parallel to the orientation of the limbs,
wherein the wall-like diaphragms form guide plates for an additional natural air flow; and
wherein the wall-like diaphragms are elongated in direction of the virtual center axis and arranged in a star-like arrangement, and wherein the star-like cooling arrangement comprises:
a chimney around the virtual center axis, which forms an inner cooling channel.
15. Dry transformer according to claim 14 , wherein the wall-like diaphragms have a height, which corresponds to at least an axial height of the cylindrical coils.
16. Dry transformer according to claim 14 , wherein the cylindrical coils and the wall-like diaphragms are oriented vertically.
17. Dry transformer according to claim 14 , wherein the wall-like diaphragms are heat absorbing and are black in color.
18. Dry transformer according to claim 14 , wherein the wall-like diaphragms are made of a material having thermoconducting characteristics.
19. Dry transformer according to claim 14 , wherein the wall-like diaphragms are three symmetrically arranged wall-like diaphragms, which are arranged at an angle of 120 degrees to one another.