Outdoor electrical device with an improved resin insulation system
AssigneeABB Technology AG
InventorsHoan D. Le, Steve A. Shaw
Life of this patent
Estimating the term…
Abstract
An electrical apparatus is provided that has an electrical device encapsulated in a plastic encasement. The encasement includes an inner shell and an outer shell. The inner shell has a thickness greater than the outer shell and the inner shell is more flexible than the outer shell. The inner shell is formed from a first resin composition that, when cured, has a tensile elongation at break of greater than 5% and the outer shell is formed from a second resin composition that, when cured, has a tensile elongation at break of less than 5%.
Claims19
An electrical apparatus adapted for exterior use, comprising:
- an electrical device;
- and
- a plastic encasement encapsulating the electrical device, the encasement comprising an inner shell and an outer shell, the inner shell having a thickness greater than the outer shell and the inner shell being more flexible than the outer shell, the inner shell being comprised of a cured first resin composition having a tensile elongation at break of greater than 5% and the outer shell being comprised of a cured second resin composition having a tensile elongation at break of less than 5%;
- and
- wherein the cured first resin composition is selected from the group consisting of a polyurethane resin composition, an epoxy resin composition, a thermoplastic rubber and butyl rubber.
A method of forming an electrical apparatus adapted for exterior use, comprising:
- providing an electrical device;
- and
- encapsulating the electrical device in a plastic encasement comprising an inner shell and an outer shell, the inner shell having a thickness greater than the outer shell and the inner shell being more flexible than the outer shell, the inner shell being comprised of a cured first resin composition having a tensile elongation at break of greater than 5% and the outer shell being comprised of a cured second resin composition having a tensile elongation at break of less than 5%;
- and
- wherein the cured first resin composition is selected from the group consisting of a polyurethane resin composition, an epoxy resin composition, a thermoplastic rubber and butyl rubber.
The method of claim 19, wherein the cured first resin composition is an aromatic polyurethane composition and the cured second resin composition is a cycloaliphatic epoxy resin composition.
The method of claim 19, wherein the cured first resin composition is an aromatic epoxy resin composition and the cured second resin composition is a cycloaliphatic resin composition.
Dependencies are inferred from the claim text.