Laminated layer structure for producing an insulation material
View Patent ↗A layer structure for producing a planar insulation laminate, including the following sequence of planar individual layers arranged one on the other: a B-stage resin, a glass fabric, a core layer made of polyester film, a glass fabric, and a B-stage resin. In the hardened state, an insulation material produced therefrom is suitable, for example, to be used as an insulation barrier between a low-voltage winding and a high-voltage winding of a transformer winding.
1. A laminated layer structure for the production of an insulation material, comprising, arranged in the following sequence:
a first B-stage resin layer;
a first glass fabric layer;
a core layer made of polyester foil;
a second glass fabric layer; and
a second B-stage resin layer,
wherein the first B-stage resin layer is in direct contact with the first glass fabric layer, and
wherein the second B-stage resin layer is in direct contact with the second glass fabric layer.
2. The laminated layer structure as claimed in claim 1 , wherein the ratio of the thickness of at least one of the first and second B-stage resin layers to the thickness of at least one of the first and second glass fabric layers adjacent thereto is about 3:20.
3. The laminated layer structure as claimed in claim 2 , wherein the thickness of each of the first and second B-stage resin layers is about 15 μm and the thickness of each of the first and second glass fabric layers is about 100 μm.
4. The laminated layer structure as claimed in claim 1 , wherein the core layer includes two plies of a polyester foil.
5. The laminated layer structure as claimed in claim 1 , wherein each of the first and second B-stage resin layers contains a phenol-epoxy precondensate or a bisphenol A resin.
6. The laminated layer structure as claimed in claim 1 , wherein the structure has a hollow cylindrical shape.
7. An insulation material produced by heating the laminated layer structure as claimed in claim 1 to a baking temperature, wherein the heating is effective to completely polymerize the B-stage resin of the first and second B-stage resin layers.
8. The insulation material as claimed in claim 7 , wherein the heating to the baking temperature takes place within a temperature range from 140° C. to 180° C. for a period of at least 30 minutes.
9. A high-voltage winding, comprising:
a lower-voltage winding that is arranged in the form of a hollow cylinder around a winding axis,
an upper-voltage winding arranged in the form of a hollow cylinder around the same winding axis, wherein the upper-voltage winding is radially separated from the lower-voltage winding, and
the laminated layer structure as claimed in claim 1 , wherein the laminated layer structure is present in a cavity formed by the radial separation between the lower-voltage winding and the upper-voltage winding.
10. The high-voltage winding as claimed in claim 9 , wherein an insulation material is produced from the laminated layer structure by heating the entire winding to a baking temperature.
11. The laminated layer structure as claimed in claim 1 , wherein the first B-stage resin layer is in direct contact with the first glass fabric layer, and wherein the second glass fabric layer is in direct contact with the second B-stage resin layer.
12. The laminated layer structure as claimed in claim 11 , wherein upon heating the first and second B-stage resin layers, the first B-stage resin layer is at least partially absorbed into interstices of the first glass fabric layer, and the second B-stage resin layer is at least partially absorbed into interstices of the second glass fabric layer.
13. The laminated layer structure as claimed in claim 1 , wherein:
the first B-stage resin layer is in directed contact with the first glass fabric layer, the first glass fabric layer is in direct contact with the core layer made of polyester foil,
the core layer made of polyester foil is in direct contact with the second glass fabric layer, and
the second glass fabric layer is in direct contact with the second B-stage resin layer.
14. The laminated layer structure as claimed in claim 13 , wherein upon heating the first and second B-stage resin layers, the first B-stage resin layer is at least partially absorbed into interstices of the first glass fabric layer, and the second B-stage resin layer is at least partially absorbed into interstices of the second glass fabric layer.
15. The laminated layer structure as claimed in claim 1 , wherein the laminate layer structure does not include a polyester non-woven.
16. The laminated layer structure as claimed in claim 4 , wherein each ply of the core layer has a thickness of about 350 μm.
17. The laminated layer structure as claimed in claim 6 , wherein all of the layers of the laminated layer structure are concentrically arranged, wherein the first B-stage resin layer is the innermost concentric layer and the second B-stage resin layer is the outermost concentric layer.
18. The laminated layer structure as claimed in claim 1 , wherein the first glass fabric layer is in direct contact with the core layer, and wherein the second glass fabric layer is in direct contact with the core layer.
19. The laminated layer structure as claimed in claim 18 , wherein the core layer consists of the polyester foil.