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US 7,023,312 B1Granted
Integrated cooling duct for resin-encapsulated distribution transformer coils
AssigneeABB Technology AG
InventorsThomas J. Lanoue, Michael J. Mitchell, William E. Pauley, Jr., Charlie H. Sarver
Life of this patent
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Abstract
A dry-type, resin-encapsulated transformer coil that includes multiple layers formed from a length of conductive material, and multiple cooling ducts that are formed of thermoplastic material and spaced between the layers of conductive material. The thermoplastic material forming the cooling ducts and the resin that encapsulates the multiple layers of conductive material are thermally and electrically compatible.
Claims21
An electrical transformer comprising:
- a coil comprising:
- a plurality of layers successively disposed around a central axis, one or more of said layers being conductive and one or more of said layers being insulating;
- a plurality of cooling ducts disposed between the layers, each of said cooling ducts being disposed between, and adjacent to, a pair of successive layers and having an interior passage and being comprised of a first resin;
- and
- a second resin encapsulating the layers, said second resin being different than the first resin.
2 more elements
An electrical transformer comprising:
- a coil formed by a method comprising:
- providing a plurality of rigid pre-formed cooling ducts, each of said pre- formed cooling ducts having an enclosed periphery with open ends and an interior passage and being comprised of a first resin reinforced with fiberglass;
- providing a length of conductive sheet material and a length of insulating sheet material;
- winding the lengths of conductive sheet material and insulating sheet material around a central axis to form a plurality of layers comprising insulating and conductive layers;
- during the winding, positioning the pre-formed cooling ducts so as to be disposed between the layers;
- and
- encapsulating the layers in a second resin, said second resin being different than the first resin.
4 more elements
A coil for an electrical transformer, said coil comprising:
- a plurality of layers successively disposed around a central axis, one or more of said layers being conductive and one or more of said layers being insulating;
- a plurality of cooling ducts disposed between the layers, each of said cooling ducts being disposed between, and adjacent to, a air of successive layers and having an interior passage and being comprised of a first resin;
- and,
- a second resin encapsulating the layers, said second resin being different then the first resin.
1 more element
Dependencies are inferred from the claim text.