Dry-type transformer core
View Patent ↗A dry-type transformer core has an iron core with a number of limbs designed to be wrapped with a winding and interconnected by a number of magnetic yokes. The object is to produce a transformer of this type in a simple manner, which is especially well protected against corrosion. For that purpose, the dry-type transformer core includes a casing that is formed onto the iron core. The casing surrounds the iron core in a substantially flush manner.
1. A dry-type transformer core, comprising:
an iron core having a plurality of limbs that are configured to be provided with a winding and a plurality of yokes connecting said limbs to one another;
a housing integrally formed on said iron core and surrounding said iron core in a substantially flush manner; and
wherein clearance spaces between said iron core and said housing are filled with a material mass.
2. The dry-type transformer core according to claim 1 , wherein said housing is non-magnetic.
3. The dry-type transformer core according to claim 1 , wherein said housing has a mean relative permeability between −1.01 and 1.01.
4. The dry-type transformer core according to claim 3 , wherein said housing has a mean relative permeability between −1.001 and 1.001.
5. The dry-type transformer core according to claim 1 , wherein said housing has a wall with a wall thickness of less than 1 cm.
6. The dry-type transformer core according to claim 1 , wherein said housing is predominantly made of a plastic material.
7. The dry-type transformer core according to claim 1 , wherein said housing is predominantly made of steel.
8. The dry-type transformer core according to claim 1 , wherein said housing is grounded.
9. The dry-type transformer core according to claim 1 , wherein said housing is constructed from a plurality of parts, and wherein one of said parts substantially surrounds one of said yokes.
10. The dry-type transformer core according to claim 1 , wherein said housing has a number of fastening devices on an outside thereof.
11. The dry-type transformer core according to claim 1 , wherein said iron core consists of amorphous foils.
12. The dry-type transformer core according to claim 1 , wherein said housing comprises an insulating part that is configured not to enable a closed conductor loop to be formed around said iron core.
13. A dry-type transformer, comprising:
a dry-type transformer core according to claim 1 ; and
a plurality of coils wound around said limbs and surrounded by said housing.
14. The dry-type transformer according to claim 13 , configured for a nominal voltage of greater than 1 kV.
15. The dry-type transformer according to claim 13 , configured for a nominal power of greater than 50 kVA.
16. The dry-type transformer according to claim 13 , configured for a nominal voltage of greater than 1 kV and a nominal power of greater than 50 kVA.
17. The dry-type transformer according to claim 13 , being a cast resin transformer.
18. The dry-type transformer core according to claim 1 , wherein said housing is predominantly made of electrically conductive material and said housing further comprises an insulating part that is configured not to enable a closed conductor loop to be formed around said iron core.
19. The dry-type transformer core according to claim 18 , wherein said limbs and said yokes extend substantially orthogonal relative to one another and said insulating part is a rectangular insulator extending along said limbs and said yoke on an inside of a rectangle formed by said limbs and yokes.